Applet is dead?
Dear All,
I have one question regarding applet. Whether applet is alive or dead. The need for the question is while browing in the site 4 months back everybody loading the applet. But past two months the applet is missing in all of those sites including "java.sun.com". So i belive applet is dead. Another point here is java webstart also
overwrites the applet in many places. Please clarify me regarding this.
Thanks and Regards
V.S.Saravanan
I solved my problem. Supreme thanks to baftos -- Re: InvocationTargetException when running signed applet locally with 7u45
Similar Messages
-
Hello
I have a strange behavior in my application. I am using Oracle Forms 10g. It happens that the applet does not react when the user clicks on a button. The applet is not frozen since the user can click on any text item in the form or he can navigate on any button (which then gets the focus) but the fact is that when he presses on any button, the application does not react, it is as if the applet is "dead". The incident happens often in production but randomly and I am not able to reproduce it at will. It can happen during a complex process or just during a simple query. I put some traces to see what is going on but I did not get any clue.
Do you have any idea ?
Thank youFirst, you should give the full version number.
Second, its important to know which runtime you use. Is it JRE?If so, which version? Is it JInitiator?
Do you have any javabeans in your forms? I've noticed that if an uncaught exception occurs in a javabean, this results in a similar behaviour as you describe.
Have a look at the java-console when the error occurs and check if theres something "unusual" in the console. -
Forms 10g, SqlLoader and client_host
Hi,
I am starting Sql Loader from Forms 10g by using client_host(sqlldr.exe userid=..). The Sql Loader works fine, data is loaded to ORACLE tables but the application fails to go back to the Forms code and execute the rest. I have also tried to call a batch file by using client_host but the problem persists, the SqlLoader works fine but the rest of the forms code is not run.
Thanks for suggestions,
DenizAs said that would be exactly for that purpose. When you call applications in blocking mode which prevents the forms applet from sending a heartbeat for a certain amount of time the forms runtime will assume the forms applet is dead and will exit. nonblocking_with_callback will return control immediately and call a user defined trigger after the application has ended. Just create a user defined trigger with the code you want to execute after SQL*Loader is finished. Pass the name of that trigger to non_blocking_with_callback, and your problem should vanish ;)
cheers -
In J2EE land, are applets dead?
Hi All ,
In J2EE land, are applets dead?
In all the J2EE examples I've seen it's always JSP or Servlets feeding HTML to the client. I am not comfortable restricting the front end to HTML.I have used Swing extensively and like the wide functionality it provides.
Anyway JSP code look awful !!! Sun seems to be placing great emphasis on JSP, but I am afraid that using it would place too many restrictions on the front end.
Does anyone feel the same way as me or am I overlooking something obvious?
Thanks,
KevinI've found a doc in %J2EE_HOME\doc\release\ConfigGuide.html
Put ur applets any where inside the %J2EE_HOME%\public_html. I put them in %J2EE_HOME%\public_html\applets. http://localhost:8000/applets/myApplet.html should load it later. By me it failed becaused myApplet was trying to access to local file. That is a security protection. I'm trying to find out how to adjust those properties files inside %J2EE_HOME%\config to enable access to local files but only when it is coming from my compi / host.
Any one have idea how to configure j2ee-server say to be http://www.mydomain.com and how to configure it to trust all objects... from mydomain.com ??
I've been able to access it only as http://localhost:8000
TIA bigerfoot -
Applet attempting to access dead http tunneling connection of its immediate predecessor
We're encountering weblogic exceptions when switching between client applets
in the same browser session. Each applet, when invoked, establishes an http
(ie, an http tunneling) connection with the weblogic server. When we use t3
as our protocol, everything works fine. When we use http, however, we get
the following client-side exception as soon as we switch over to the second
applet.
weblogic.utils.AssertionError: ***** ASSERTION FAILED *****[ Dead thread ]
at weblogic.net.http.KeepAliveCache.put(KeepAliveCache.java:57)
at weblogic.net.http.HttpClient.finished(HttpClient.java:147)
at weblogic.net.http.KeepAliveStream.close(KeepAliveStream.java:89)
at weblogic.net.http.KeepAliveStream.justRead(KeepAliveStream.java:37)
at weblogic.net.http.KeepAliveStream.read(KeepAliveStream.java:47)
Some details:
1) We are using sun java plugin, v1.3
2) We are using weblgoc 5.1, sp5.
3) We can temporarily stop this problem from happening by delaying the death
of the first applet. That is, we cause its thread to pause before allowing
itself to die. When we do this, the second applet works fine UNTIL the first
one dies, then it pukes with a similar error to the one above.
It seems like the 2nd applet is trying to access the first one's http
connection stream, and in doing so is throwing an exception upon discovering
that this applet's thread is already gone.
Can anyone guess why this may be happening?
Many thanks.
RamseyRamsey Shehadeh <[email protected]> wrote:
>
Yes, we've tried that. Doing two t3 (or t3s) connections seems to work
fine. It's only the tunneling that's causing us problems.interesting...
looks like they are sharing.
Is there any
way you know of to prevent the applets from sharing sessions? dont know at this time...
session identification are put in cookies and browser instance maps that to a URL.So everytime the browser connects to the URL it identifies with these and they, as far as i know will be same for both applets...
purely a browser concern?dont know...
maybe weblogic could do something at its marshalling/unmarshalling layer of HTTP tunelling...but not sure...
>
Thanks.
Ramsey
shivu wrote:
AFAIK this could be because both applets are sharing the same connection/session...I think when you run two applets in the same browser session, some things get shared especially HTTP Session...
Are you making two different t3 connections in two applets?
"Ramsey Shehadeh" <[email protected]> wrote:
We're encountering weblogic exceptions when switching between client applets
in the same browser session. Each applet, when invoked, establishes an http
(ie, an http tunneling) connection with the weblogic server. When we use t3
as our protocol, everything works fine. When we use http, however, we get
the following client-side exception as soon as we switch over to the second
applet.
weblogic.utils.AssertionError: ***** ASSERTION FAILED *****[ Dead thread ]
at weblogic.net.http.KeepAliveCache.put(KeepAliveCache.java:57)
at weblogic.net.http.HttpClient.finished(HttpClient.java:147)
at weblogic.net.http.KeepAliveStream.close(KeepAliveStream.java:89)
at weblogic.net.http.KeepAliveStream.justRead(KeepAliveStream.java:37)
at weblogic.net.http.KeepAliveStream.read(KeepAliveStream.java:47)
Some details:
1) We are using sun java plugin, v1.3
2) We are using weblgoc 5.1, sp5.
3) We can temporarily stop this problem from happening by delaying the death
of the first applet. That is, we cause its thread to pause before allowing
itself to die. When we do this, the second applet works fine UNTIL the first
one dies, then it pukes with a similar error to the one above.
It seems like the 2nd applet is trying to access the first one's http
connection stream, and in doing so is throwing an exception upon discovering
that this applet's thread is already gone.
Can anyone guess why this may be happening?
Many thanks.
Ramsey -
Applets not working in WLS 6.1
I am migrating an application from WLS 5.1 SP 9 to WLS 6.1 SP 1. This
application contains several applets and ran without error or problems
under WLS 5.1. However I'm seeing strange behaviour/errors under WLS
6.1.
Environment:
Unix box:
Sun Solaris - SunOS dargo 5.6 Generic_105181-28 sun4u sparc
SUNW,Ultra-Enterprise
Oracle 8.1.7.2
JDK 1.3.1 that was delivered with WLS 6.1
Client -- Netscape 4.75 from Window 2000
In my WLS 5.1 environment I delivered the applets to
/opt/weblogic/myserver/applets and my JSPS/HTML to
/opt/weblogic/myserver/public_html.
In WLS 6.1 I'm currently working on deploying the application in
exploded format for debugging. I delivered the jar'd up applets to
/opt/fedex/crs/currentGUI/applets. The remainder of the application is
in exploded format under /users/crs/{ApplicationName}.
/users/crs/{ApplicationName} has the following structure:
deploy
META-INF -- Contains an application.xml
astracons-web -- contains the JSPS/HTML
WEB-INF
classes -- contains the compiled servlet classes
lib -- empty
astracons-ejb
META-INF -- deployment descriptors for EJB
com/.... top level of our package that contains our
EJB.
Application appears to work correctly with the exception of the
applets.
The applet jar files appear OK (jar tvf and jar xvf function correctly).
Applet tag in JSP is:
<applet width="180" height="335"
codebase="/classes/"
archive="treetable.jar"
code="com.scand.treetable.JTreeGridApplet.class"
CLASSPATH includes /opt/fedex/crs/currentGUI/applets/treetable.jar. Applet tag
and classpath are
consistent for the other applet (SelectedLocations).
When I run the application and access the LocationLookupJSP, the
SelectedLocations applet appears on the screen and appears to function
correctly (despite the errors in the java console). The treetable
applet shows the following error on the status line "Applet
com.scand.treetable.JTreeGridApplet can't init: NEW". I also get the bad zip file
format error in the
console. Java console errors are:
Netscape Communications Corporation -- Java 1.1.5
Type '?' for options.
Symantec Java! ByteCode Compiler Version 210.065
Copyright (C) 1996-97 Symantec Corporation
java.io.IOException: bad zip file format
at netscape.applet.AppletClassLoader.openArchive(Compiled Code)
at netscape.applet.AppletClassLoader.openArchive(Compiled Code)
at netscape.applet.AppletClassLoader.<init>(Compiled Code)
at netscape.applet.AppletClassLoader.getClassLoader(Compiled Code)
at
netscape.applet.DerivedAppletFrame$LoadAppletEvent.dispatch(Compiled
Code)
at java.awt.EventDispatchThread$EventPump.dispatchEvents(Compiled
Code)
at java.awt.EventDispatchThread.run(Compiled Code)
at
netscape.applet.DerivedAppletFrame$AppletEventDispatchThread.run(Compiled
Code)
# Unable to load archive
http://dargo.rmtc.fedex.com:7009/classes/SelectedLocations.jar:
java.io.IOException: bad zip file format
java.io.IOException: bad zip file format
at netscape.applet.AppletClassLoader.openArchive(Compiled Code)
at netscape.applet.AppletClassLoader.getClassLoader(Compiled Code)
at
netscape.applet.DerivedAppletFrame$LoadAppletEvent.dispatch(Compiled
Code)
at java.awt.EventDispatchThread$EventPump.dispatchEvents(Compiled
Code)
at java.awt.EventDispatchThread.run(Compiled Code)
at
netscape.applet.DerivedAppletFrame$AppletEventDispatchThread.run(Compiled
Code)
java.lang.ArrayIndexOutOfBoundsException
at java.lang.Throwable.printStackTrace(Compiled Code)
If I run the AstraconsSummaryReport.jsp everything appears to work correctly
however the java
console shows the following errors:
Netscape Communications Corporation -- Java 1.1.5
java.io.IOException: bad zip file format
at netscape.applet.AppletClassLoader.openArchive(Compiled Code)
at netscape.applet.AppletClassLoader.openArchive(Compiled Code)
at netscape.applet.AppletClassLoader.<init>(Compiled Code)
at netscape.applet.AppletClassLoader.getClassLoader(Compiled Code)
at
netscape.applet.DerivedAppletFrame$LoadAppletEvent.dispatch(Compiled
Code)
at java.awt.EventDispatchThread$EventPump.dispatchEvents(Compiled
Code)
at java.awt.EventDispatchThread.run(Compiled Code)
at
netscape.applet.DerivedAppletFrame$AppletEventDispatchThread.run(Compiled
Code)
# Unable to load archive
http://dargo.rmtc.fedex.com:7009/classes/treetable.jar:
java.io.IOException: bad zip file format
I've searched through the newsgroups and the WLS 6.1 documentation but
have reached a dead-end. Any help you can provide would be greatly
appreciated.
Terry Jahelka
Terry:
I recommend opening a case with BEA Support. I don't see a simple answer without someone taking
the time to personally sort this out with you.
Regards,
Jim Brown
Terry Jahelka wrote:
> I am migrating an application from WLS 5.1 SP 9 to WLS 6.1 SP 1. This
> application contains several applets and ran without error or problems
> under WLS 5.1. However I'm seeing strange behaviour/errors under WLS
> 6.1.
>
> Environment:
>
> Unix box:
>
> Sun Solaris - SunOS dargo 5.6 Generic_105181-28 sun4u sparc
> SUNW,Ultra-Enterprise
> Oracle 8.1.7.2
> JDK 1.3.1 that was delivered with WLS 6.1
>
> Client -- Netscape 4.75 from Window 2000
>
> In my WLS 5.1 environment I delivered the applets to
> /opt/weblogic/myserver/applets and my JSPS/HTML to
> /opt/weblogic/myserver/public_html.
>
> In WLS 6.1 I'm currently working on deploying the application in
> exploded format for debugging. I delivered the jar'd up applets to
> /opt/fedex/crs/currentGUI/applets. The remainder of the application is
> in exploded format under /users/crs/{ApplicationName}.
>
> /users/crs/{ApplicationName} has the following structure:
> deploy
> META-INF -- Contains an application.xml
> astracons-web -- contains the JSPS/HTML
> WEB-INF
> classes -- contains the compiled servlet classes
> lib -- empty
> astracons-ejb
> META-INF -- deployment descriptors for EJB
> com/.... top level of our package that contains our
> EJB.
>
> Application appears to work correctly with the exception of the
> applets.
>
> The applet jar files appear OK (jar tvf and jar xvf function correctly).
>
> Applet tag in JSP is:
>
> <applet width="180" height="335"
> codebase="/classes/"
> archive="treetable.jar"
> code="com.scand.treetable.JTreeGridApplet.class"
>
> CLASSPATH includes /opt/fedex/crs/currentGUI/applets/treetable.jar. Applet tag
> and classpath are
> consistent for the other applet (SelectedLocations).
>
> ____________________________________________________________________________________________
>
> When I run the application and access the LocationLookupJSP, the
> SelectedLocations applet appears on the screen and appears to function
> correctly (despite the errors in the java console). The treetable
> applet shows the following error on the status line "Applet
> com.scand.treetable.JTreeGridApplet can't init: NEW". I also get the bad zip file
> format error in the
> console. Java console errors are:
>
> Netscape Communications Corporation -- Java 1.1.5
>
> Type '?' for options.
>
> Symantec Java! ByteCode Compiler Version 210.065
> Copyright (C) 1996-97 Symantec Corporation
> java.io.IOException: bad zip file format
> at netscape.applet.AppletClassLoader.openArchive(Compiled Code)
> at netscape.applet.AppletClassLoader.openArchive(Compiled Code)
> at netscape.applet.AppletClassLoader.<init>(Compiled Code)
> at netscape.applet.AppletClassLoader.getClassLoader(Compiled Code)
> at
> netscape.applet.DerivedAppletFrame$LoadAppletEvent.dispatch(Compiled
> Code)
> at java.awt.EventDispatchThread$EventPump.dispatchEvents(Compiled
> Code)
> at java.awt.EventDispatchThread.run(Compiled Code)
> at
> netscape.applet.DerivedAppletFrame$AppletEventDispatchThread.run(Compiled
> Code)
> # Unable to load archive
> http://dargo.rmtc.fedex.com:7009/classes/SelectedLocations.jar:
> java.io.IOException: bad zip file format
> java.io.IOException: bad zip file format
> at netscape.applet.AppletClassLoader.openArchive(Compiled Code)
> at netscape.applet.AppletClassLoader.getClassLoader(Compiled Code)
> at
> netscape.applet.DerivedAppletFrame$LoadAppletEvent.dispatch(Compiled
> Code)
> at java.awt.EventDispatchThread$EventPump.dispatchEvents(Compiled
> Code)
> at java.awt.EventDispatchThread.run(Compiled Code)
> at
> netscape.applet.DerivedAppletFrame$AppletEventDispatchThread.run(Compiled
> Code)
> java.lang.ArrayIndexOutOfBoundsException
> at java.lang.Throwable.printStackTrace(Compiled Code)
>
> _____________________________________________________________________________________________
>
> If I run the AstraconsSummaryReport.jsp everything appears to work correctly
> however the java
> console shows the following errors:
>
> Netscape Communications Corporation -- Java 1.1.5
>
> java.io.IOException: bad zip file format
> at netscape.applet.AppletClassLoader.openArchive(Compiled Code)
> at netscape.applet.AppletClassLoader.openArchive(Compiled Code)
> at netscape.applet.AppletClassLoader.<init>(Compiled Code)
> at netscape.applet.AppletClassLoader.getClassLoader(Compiled Code)
> at
> netscape.applet.DerivedAppletFrame$LoadAppletEvent.dispatch(Compiled
> Code)
> at java.awt.EventDispatchThread$EventPump.dispatchEvents(Compiled
> Code)
> at java.awt.EventDispatchThread.run(Compiled Code)
> at
> netscape.applet.DerivedAppletFrame$AppletEventDispatchThread.run(Compiled
> Code)
> # Unable to load archive
> http://dargo.rmtc.fedex.com:7009/classes/treetable.jar:
> java.io.IOException: bad zip file format
>
> I've searched through the newsgroups and the WLS 6.1 documentation but
> have reached a dead-end. Any help you can provide would be greatly
> appreciated.
>
> Terry Jahelka
Jim Brown
Developer Relations Engineer
BEA Support
-
Reading a pdf file from URL into Byte array/ByteBuffer in an applet.
I'm trying to figure out why this particular snippet of code isn't working for me. I've got an applet which is supposed to read a .pdf and display it with a pdf-renderer library, but for some reason when I read in the .pdf files which sit on my server, they end up as being corrupt. I've tested it by writing the files back out again.
I've tried viewing the applet in both IE and Firefox and the corrupt files occur. Funny thing is, when I trying viewing the applet in Safari (for Windows), the file is actually fine! I understand the JVM might be different, but I am still lost. I've compiled in Java 1.5. JVMs are 1.6. The snippet which reads the file is below.
public static ByteBuffer getAsByteArray(URL url) throws IOException {
ByteArrayOutputStream tmpOut = new ByteArrayOutputStream();
URLConnection connection = url.openConnection();
int contentLength = connection.getContentLength();
InputStream in = url.openStream();
byte[] buf = new byte[512];
int len;
while (true) {
len = in.read(buf);
if (len == -1) {
break;
tmpOut.write(buf, 0, len);
tmpOut.close();
ByteBuffer bb = ByteBuffer.wrap(tmpOut.toByteArray(), 0,
tmpOut.size());
//Lines below used to test if file is corrupt
//FileOutputStream fos = new FileOutputStream("C:\\abc.pdf");
//fos.write(tmpOut.toByteArray());
return bb;
}I must be missing something, and I've been banging my head trying to figure it out. Any help is greatly appreciated. Thanks.Keshav.. wrote:
I too was going through the same problem but I found for some pdfs it worked fine.I didnt get ur solution.Please explain bcoz it may work for every pdfThis thread is over 3 years old and dead. Please open a new thread which provides details of the problem you are having. Link to this thread if you think it is necessary.
I shall lock this thread. -
Floating boxes applet with drag events need click event
I Have an applet cobbled from the net & modified. Is works but needs one major event added. It draws "Graphics.drawline" boxes with a text "String" inside each box ( the text string represents an URL location). These "boxes" are objects which are "draggable to other locations on canvas & therefore can be independently positioned by user. Each box redraws itself periodically to a slightly different screen location & becomes stationary after a 5 or 6 seconds. The point is, all of this "drag & mobility" behavior must remain intact & is not part of the "problem task".
Task: Need to have an "event" behavior added in one of two ways ( or a 3rd way if there is another ) whichever is quickest/ easiest. "Clickable mouse events" must be added to each box. ( boxes are built in a loop so adding to one will add to other locations & create as many "buttons" as there are boxes) . At each box's location, clicking one box should be an event which fires & clicking a different box should be a separate event which fires. Separate , so that URL location can be "hotlinked" to each box. That URL is currently displayed in the boxes (visible when running applet).
1st possible solution: Exchange these "boxes" which appear on canvas into clickable event "Graph panel.buttons" ( for example or some other clickable object) which maintains existing "drag" behavior of boxes. These buttons must each have "clickability" with mouse events to enable placing "getAppletContext. showDocument()" code with these events ( e.g., "hotlinked" to http locations).
or
2nd possible solution:. The drawstring boxes are currently dead string text with no event model other than the "drag" feature associated with each box. Must add an additional mouse event behavior to existing boxes so they are "clickable" ( or text inside is clickable) and can then execute "showDocument()" URL when clicked independently.
Maybe there is a #3. I don't know what that would be. Open to try anything without losing the drag & placement mobility of existing boxes.
These "boxes" could be images, or event buttons - doesnt matter.
Not sure if #2 is possible & have not been able to accomplish #1. Must stay within existing AWT framework so IE browsers can run it natively ( which of course IE cannot run Swing graphics unless a Sun plugin loaded ).
Applet is a single file ( creating 4 classes).
html file (which invokes it) passes a string param which is broken into above noted URL strings in each box.
Running this applet, you see a "button" event ( at base of canvas labeled "NewUrl" ) which pops up an url location when clicked ( using "showdocument"). This button is not attached to locations or text of each box object ( which is the "task" to accomplish) . The button does represent the kind of event behavior which each "box" should have when task is achieved. So the box can be exchanged with buttons or the boxes can be imbued with events to hyperlink like a button.
In spirit of solution #1, here is the bonehead attempt I tried which did not work: copied entire "if" block of logic from the button event (sited in preceding paragraph) into region of code which builds boxes ( "for" loop of "drawstring" method).
"g.drawString(doit, x - (w-10)/2, (y - (h-4)/2) + fm.getAscent());"
I copied all the "if" block of logic for button creation into the area immediately after the above line ( for loop which builds the boxes). Hoping that I could create buttons with events, along with all the boxes (which are getting created using "drawstring" above in a "for" loop). These "buttons" must also have positioning info of each box to appear in different locations on the canvas. Positioning data is not in that "if" block of code but it would have been a start to get the multiple buttons created ( even if all drawn in one spot). The "if" code block I've provieded for an example begins with the line:
" if ("NewUrl".equals(arg)) { "
and ends with with lines:
" return true; "
" } " //< -- end of above if block
This full "if" block can be seen in the listing below:
This "if" block creates the "NewUrl" button. Of course, I got a bunch of errors when I tried to copy this block to the above location:
variable: "arg" "not found in class GraphPanel".
methods: "getcodebase, showstatus, getappletcontext()"
"not found in class GraphPanel".
----------- The applet code in total follows next
Here are both the java & htm complete source.
import java.net.MalformedURLException;
import java.net.URL;
import java.net.*;
import java.util.*;
import java.awt.*;
import java.applet.Applet;
import java.applet.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.*;
class Node {
double x;
double y;
double dx;
double dy;
boolean fixed;
String lbl;
class Edge {
int from;
int to;
double len;
} // eEdgeCla
class GraphPanel extends Panel implements Runnable {
Box box;
int nnodes;
Node nodes[] = new Node[100];
int nedges;
Edge edges[] = new Edge[200];
Thread relaxer;
boolean showit;
boolean random;
GraphPanel(Box box) {
this.box = box;
} //ebox
int findNode(String lbl) {
for (int i = 0 ; i < nnodes ; i++) {
if (nodes.lbl.equals(lbl)) {
return i;
return addNode(lbl);
int addNode(String lbl) {
Node n = new Node();
n.x = 10 + 380*Math.random();
n.y = 10 + 380*Math.random();
n.lbl = lbl;
nodes[nnodes] = n;
return nnodes++;
void addEdge(String from, String to, int len) {
Edge e = new Edge();
e.from = findNode(from);
e.to = findNode(to);
e.len = len;
edges[nedges++] = e;
public void run() {
int i3=0;
while (true) {
relax();
if (random && (Math.random() < 0.03)) {
Node n = nodes[(int) (1 * nnodes) ]; // no
if (!n.fixed) {
n.x += (100*0.02) - 50;
n.y += (100*0.02) - 50; //
try {
Thread.sleep(4000);
} catch (InterruptedException e) {
break;
i3++;
} //ew
} // epublrun()
synchronized void relax() {
for (int i = 0 ; i < nedges ; i++) {
Edge e = edges;
double vx = nodes[e.to].x - nodes[e.from].x;
double vy = nodes[e.to].y - nodes[e.from].y;
double len = Math.sqrt(vx * vx + vy * vy);
double f = (edges.len - len) / (len * 3) ;
double dx = f * vx;
double dy = f * vy;
nodes[e.to].dx += dx;
nodes[e.to].dy += dy;
nodes[e.from].dx += -dx;
nodes[e.from].dy += -dy;
} //efo
for (int i = 0 ; i < nnodes ; i++) {
Node n1 = nodes;
double dx = 0;
double dy = 0;
for (int j = 0 ; j < nnodes ; j++) {
if (i == j) {
continue;
Node n2 = nodes[j];
double vx = n1.x - n2.x;
double vy = n1.y - n2.y;
double len = vx * vx + vy * vy;
if (len == 0) {
dx += 0.02;
dy += 0.02;
} else if (len < 100*100) {
dx += vx / len;
dy += vy / len;
} //ef3a
double dlen = dx * dx + dy * dy;
if (dlen > 0) {
dlen = Math.sqrt(dlen) / 2;
n1.dx += dx / dlen;
n1.dy += dy / dlen;
} //ef3
Dimension d = size();
// f4
for (int i = 0 ; i < nnodes ; i++) {
Node n = nodes;
if (!n.fixed) {
n.x += Math.max(-5, Math.min(5, n.dx));
n.y += Math.max(-5, Math.min(5, n.dy));
if (n.x < 0) {
n.x = 0;
} else if (n.x > d.width) {
n.x = d.width;
if (n.y < 0) {
n.y = 0;
} else if (n.y > d.height) {
n.y = d.height;
n.dx /= 2;
n.dy /= 2;
repaint();
Node pick;
boolean pickfixed;
Image offscreen;
Dimension offscreensize;
Graphics offgraphics;
final Color fixedColor = Color.green;
final Color selectColor = Color.gray;
final Color edgeColor = Color.black;
final Color nodeColor = new Color(200, 90, 50);
final Color showitColor = Color.gray;
final Color arcColor1 = Color.black;
final Color arcColor2 = Color.orange;
final Color arcColor3 = Color.blue;
public void paintNode( Graphics g, Node n, FontMetrics fm) {
int x = (int)n.x;
int y = (int)n.y;
g.setColor((n == pick) ? selectColor : (n.fixed ? fixedColor : nodeColor));
int w = fm.stringWidth(n.lbl) + 10;
int h = fm.getHeight() + 4;
g.fillRect(x - w/2, y - h / 2, w, h);
g.setColor(Color.black);
g.drawRect(x - w/2, y - h / 2, w-1, h-1);
String doit = n.lbl.replace('x','/');
g.drawString(doit, x - (w-10)/2, (y - (h-4)/2) + fm.getAscent());
} // epa
public synchronized void update(Graphics g) {
Dimension d = size();
if ((offscreen == null) || (d.width != offscreensize.width) || (d.height != offscreensize.height)) {
offscreen = createImage(d.width, d.height);
offscreensize = d;
offgraphics = offscreen.getGraphics();
offgraphics.setFont(getFont());
offgraphics.setColor(getBackground());
offgraphics.fillRect(0, 0, d.width, d.height);
for (int i = 0 ; i < nedges ; i++) {
Edge e = edges;
int x1 = (int)nodes[e.from].x;
int y1 = (int)nodes[e.from].y;
int x2 = (int)nodes[e.to].x;
int y2 = (int)nodes[e.to].y;
int len = (int)Math.abs(Math.sqrt((x1-x2)*(x1-x2) + (y1-y2)*(y1-y2)) - e.len);
offgraphics.setColor((len < 10) ? arcColor1 : (len < 20 ? arcColor2 : arcColor3)) ;
offgraphics.drawLine(x1, y1, x2, y2);
if (showit) {
String lbl = String.valueOf(len);
offgraphics.setColor(showitColor);
offgraphics.drawString("href= http://localhost:"+lbl, x1 + (x2-x1)/2, y1 + (y2-y1)/2);
offgraphics.setColor(edgeColor);
} //ef5
FontMetrics fm = offgraphics.getFontMetrics();
for (int i = 0 ; i < nnodes ; i++) {
paintNode( offgraphics, nodes, fm); //or
g.drawImage(offscreen, 0, 0, null);
public synchronized boolean mouseDown(Event evt, int x, int y) {
double bestdist = Double.MAX_VALUE;
for (int i = 0 ; i < nnodes ; i++) {
Node n = nodes;
double dist = (n.x - x) * (n.x - x) + (n.y - y) * (n.y - y);
if (dist < bestdist) {
pick = n;
bestdist = dist;
pickfixed = pick.fixed;
pick.fixed = true;
pick.x = x;
pick.y = y;
repaint();
return true;
public synchronized boolean mouseDrag(Event evt, int x, int y) {
pick.x = x;
pick.y = y;
repaint();
return true;
} //e-pubsyncmousedrag
public synchronized boolean mouseUp(Event evt, int x, int y) {
pick.x = x;
pick.y = y;
pick.fixed = pickfixed;
pick = null;
repaint();
return true;
public void start() {
relaxer = new Thread(this);
relaxer.start();
public void stop() {
relaxer.stop();
public class Box extends Applet {
GraphPanel panel;
public void init() {
setLayout(new BorderLayout());
panel = new GraphPanel(this);
add("Center", panel);
Panel p = new Panel();
add("South", p);
p.add(new Button("Reposition"));
p.add(new Button("NewUrl"));
p.add(new Checkbox("Showit"));
String edges = getParameter("edges"); // putinli
for (StringTokenizer t = new StringTokenizer(edges, ",") ; t.hasMoreTokens() ; ) {
String str = t.nextToken();
int i = str.indexOf('-');
if (i > 0) { int len = 50;
int j = str.indexOf('/');
if (j > 0) {
len = Integer.valueOf(str.substring(j+1)).intValue();
str = str.substring(0, j);
panel.addEdge(str.substring(0,i), str.substring(i+1), len);
} //ef8
Dimension d = size();
String center = getParameter("center");
if (center != null){
Node n = panel.nodes[panel.findNode(center)];
n.x = d.width / 2;
n.y = d.height / 2;
n.fixed = true;
} // eif
} // ep
public void start() {
panel.start();
public void stop() {
panel.stop();
public boolean action(Event evt, Object arg) {
if (arg instanceof Boolean) {
if (((Checkbox)evt.target).getLabel().equals("Showit")) {
panel.showit = ((Boolean)arg).booleanValue();
}// e-
else {
panel.random = ((Boolean)arg).booleanValue();
return true;
} // e-if instof bool
if ("Reposition".equals(arg)) {
Dimension d = size();
for (int i = 0 ; i < panel.nnodes ; i++) {
Node n = panel.nodes;
if (!n.fixed) {
n.x = 10 + (d.width-20)*Math.random();
n.y = 10 + (d.height-20)*Math.random();
} //ei
} //ef9
return true;
} //eif scram
if ("NewUrl".equals(arg)) {
Dimension d = size();
URL url = getCodeBase();
try {
getAppletContext().showDocument( new URL(url+"main.htm"), "_blank" );
try {
Thread.sleep(1000);
} catch (InterruptedException e) { }
} catch(MalformedURLException e) {
showStatus("814 URL not found");
for (int i = 0 ; i < panel.nnodes ; i++) {
Node n = panel.nodes;
if (!n.fixed) {
n.x += (80*0.02) - 40;
n.y += (80*0.02) - 40;
return true;
} //ei
return false;
-----------------------htm file to launch------------------------------
<html>
<head>
<title>R
</title>
</head>
<body>
<h3>
<center>
R
</center>
</h3>
I
<b>
</b>
<table border = 1>
<td>De<td>Test List<tr>
<td>N <td><tr>
<td>N <td><tr>
</table>
<b>view </b>
<applet code="Box.class" CODEBASE=. width=1000 height=600
ALT="Test ">
<param name=edges value="http:xxabc.htm-http:xxnet.htm,http:xxthis.htm-http:xx.comet.htm,http:xxnewsighting.htm-http:xxstar.htm,http:xxmoon.htm-http:xxNeptune.htm">
<hr>
</applet>
</b>
<p>
<table border = 1>
<tr>
<tr>
</table>
</html>
</body>
instructions to compile :
0 : The discussion becomes easy to follow after 1st compiling
& viewing the applet.
1. : cut out applet code.
2. : the post somehow deleted all references to "" <--- HERE
see, the data has been deleted again as I preview this post.
( that "" should contain an "i" array increment argument:
"open square bracket" "i" "close square bracket" ) array
so "javac Box.java" will get 10 errors. These "[" "i" "]"
array args must be replaced to compile the code.
3. : All array variables inside the 10 "for" loops ( the bare words
"edges" and "nodes" ) without array increment "i" should
read "edges" "[" "i" "]" & "nodes" "[" "i" "]".
The 10 location lines are approx:
line #65, #129, #136, #149, #195, #283, #311, #331, #477, #522
4. : These 10 edits reqresent a missing "i" to all 10 for loop arrays.
for eddges & nodes. fix this & javac Box.java" will get
4 class files.
5. : cut "Box.htm" from post & do "appletviewer Box.htm"
or put in an apache "htdoc" or tomcat "servlet" http delivered
directory & call "http://localhost/Box.htm.
6. : of course, selecting the event button "NewUrl" will not
work in appletviewer but will work in an http web location.
7. : post your questions to problem or fixes to problem as I'm
monitoring closely. TIA.Thanks for code post tip to fix array deletion problem.
Here is code reposted using delimiters with will
compile straight out of cut/paste.import java.net.MalformedURLException;
import java.net.URL;
import java.net.*;
import java.util.*;
import java.awt.*;
import java.applet.Applet;
import java.applet.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.*;
class Node {
double x;
double y;
double dx;
double dy;
boolean fixed;
String lbl;
class Edge {
int from;
int to;
double len;
} // eEdgeCla
class GraphPanel extends Panel implements Runnable {
Box box;
int nnodes;
Node nodes[] = new Node[100];
int nedges;
Edge edges[] = new Edge[200];
Thread relaxer;
boolean showit;
boolean random;
GraphPanel(Box box) {
this.box = box;
} //ebox
int findNode(String lbl) {
for (int i = 0 ; i < nnodes ; i++) {
//if (nodes.lbl.equals(lbl)) {
if (nodes.lbl.equals(lbl)) {
return i;
return addNode(lbl);
int addNode(String lbl) {
Node n = new Node();
n.x = 10 + 380*Math.random();
n.y = 10 + 380*Math.random();
n.lbl = lbl;
nodes[nnodes] = n;
return nnodes++;
void addEdge(String from, String to, int len) {
Edge e = new Edge();
e.from = findNode(from);
e.to = findNode(to);
e.len = len;
edges[nedges++] = e;
public void run() {
int i3=0;
while (true) {
relax();
if (random && (Math.random() < 0.03)) {
Node n = nodes[(int) (1 * nnodes) ]; // no
if (!n.fixed) {
n.x += (100*0.02) - 50;
n.y += (100*0.02) - 50; //
try {
Thread.sleep(4000);
} catch (InterruptedException e) {
break;
i3++;
} //ew
} // epublrun()
synchronized void relax() {
for (int i = 0 ; i < nedges ; i++) {
//Edge e = edges;
Edge e = edges[i];
double vx = nodes[e.to].x - nodes[e.from].x;
double vy = nodes[e.to].y - nodes[e.from].y;
double len = Math.sqrt(vx * vx + vy * vy);
//double f = (edges.len - len) / (len * 3) ;
double f = (edges[i].len - len) / (len * 3) ;
double dx = f * vx;
double dy = f * vy;
nodes[e.to].dx += dx;
nodes[e.to].dy += dy;
nodes[e.from].dx += -dx;
nodes[e.from].dy += -dy;
} //efo
for (int i = 0 ; i < nnodes ; i++) {
//Node n1 = nodes[i];
Node n1 = nodes[i];
double dx = 0;
double dy = 0;
for (int j = 0 ; j < nnodes ; j++) {
if (i == j) {
continue;
Node n2 = nodes[j];
double vx = n1.x - n2.x;
double vy = n1.y - n2.y;
double len = vx * vx + vy * vy;
if (len == 0) {
dx += 0.02;
dy += 0.02;
} else if (len < 100*100) {
dx += vx / len;
dy += vy / len;
} //ef3a
double dlen = dx * dx + dy * dy;
if (dlen > 0) {
dlen = Math.sqrt(dlen) / 2;
n1.dx += dx / dlen;
n1.dy += dy / dlen;
} //ef3
Dimension d = size();
// f4
for (int i = 0 ; i < nnodes ; i++) {
//Node n = nodes;
Node n = nodes[i];
if (!n.fixed) {
n.x += Math.max(-5, Math.min(5, n.dx));
n.y += Math.max(-5, Math.min(5, n.dy));
if (n.x < 0) {
n.x = 0;
} else if (n.x > d.width) {
n.x = d.width;
if (n.y < 0) {
n.y = 0;
} else if (n.y > d.height) {
n.y = d.height;
n.dx /= 2;
n.dy /= 2;
repaint();
Node pick;
boolean pickfixed;
Image offscreen;
Dimension offscreensize;
Graphics offgraphics;
final Color fixedColor = Color.green;
final Color selectColor = Color.gray;
final Color edgeColor = Color.black;
final Color nodeColor = new Color(200, 90, 50);
final Color showitColor = Color.gray;
final Color arcColor1 = Color.black;
final Color arcColor2 = Color.orange;
final Color arcColor3 = Color.blue;
public void paintNode( Graphics g, Node n, FontMetrics fm) {
int x = (int)n.x;
int y = (int)n.y;
g.setColor((n == pick) ? selectColor : (n.fixed ? fixedColor : nodeColor));
int w = fm.stringWidth(n.lbl) + 10;
int h = fm.getHeight() + 4;
g.fillRect(x - w/2, y - h / 2, w, h);
g.setColor(Color.black);
g.drawRect(x - w/2, y - h / 2, w-1, h-1);
String doit = n.lbl.replace('x','/');
g.drawString(doit, x - (w-10)/2, (y - (h-4)/2) + fm.getAscent());
} // epa
public synchronized void update(Graphics g) {
Dimension d = size();
if ((offscreen == null) || (d.width != offscreensize.width) || (d.height != offscreensize.height)) {
offscreen = createImage(d.width, d.height);
offscreensize = d;
offgraphics = offscreen.getGraphics();
offgraphics.setFont(getFont());
offgraphics.setColor(getBackground());
offgraphics.fillRect(0, 0, d.width, d.height);
for (int i = 0 ; i < nedges ; i++) {
//Edge e = edges;
Edge e = edges[i];
int x1 = (int)nodes[e.from].x;
int y1 = (int)nodes[e.from].y;
int x2 = (int)nodes[e.to].x;
int y2 = (int)nodes[e.to].y;
int len = (int)Math.abs(Math.sqrt((x1-x2)*(x1-x2) + (y1-y2)*(y1-y2)) - e.len);
offgraphics.setColor((len < 10) ? arcColor1 : (len < 20 ? arcColor2 : arcColor3)) ;
offgraphics.drawLine(x1, y1, x2, y2);
if (showit) {
String lbl = String.valueOf(len);
offgraphics.setColor(showitColor);
offgraphics.drawString("href= http://localhost:"+lbl, x1 + (x2-x1)/2, y1 + (y2-y1)/2);
offgraphics.setColor(edgeColor);
} //ef5
FontMetrics fm = offgraphics.getFontMetrics();
for (int i = 0 ; i < nnodes ; i++) {
//paintNode( offgraphics, nodes, fm); //or
paintNode( offgraphics, nodes[i], fm); //or
g.drawImage(offscreen, 0, 0, null);
public synchronized boolean mouseDown(Event evt, int x, int y) {
double bestdist = Double.MAX_VALUE;
for (int i = 0 ; i < nnodes ; i++) {
//Node n = nodes;
Node n = nodes[i];
double dist = (n.x - x) * (n.x - x) + (n.y - y) * (n.y - y);
if (dist < bestdist) {
pick = n;
bestdist = dist;
pickfixed = pick.fixed;
pick.fixed = true;
pick.x = x;
pick.y = y;
repaint();
return true;
public synchronized boolean mouseDrag(Event evt, int x, int y) {
pick.x = x;
pick.y = y;
repaint();
return true;
} //e-pubsyncmousedrag
public synchronized boolean mouseUp(Event evt, int x, int y) {
pick.x = x;
pick.y = y;
pick.fixed = pickfixed;
pick = null;
repaint();
return true;
public void start() {
relaxer = new Thread(this);
relaxer.start();
public void stop() {
relaxer.stop();
public class Box extends Applet {
GraphPanel panel;
public void init() {
setLayout(new BorderLayout());
panel = new GraphPanel(this);
add("Center", panel);
Panel p = new Panel();
add("South", p);
p.add(new Button("Reposition"));
p.add(new Button("NewUrl"));
p.add(new Checkbox("Showit"));
String edges = getParameter("edges"); // putinli
for (StringTokenizer t = new StringTokenizer(edges, ",") ; t.hasMoreTokens() ; ) {
String str = t.nextToken();
int i = str.indexOf('-');
if (i > 0) { int len = 50;
int j = str.indexOf('/');
if (j > 0) {
len = Integer.valueOf(str.substring(j+1)).intValue();
str = str.substring(0, j);
panel.addEdge(str.substring(0,i), str.substring(i+1), len);
} //ef8
Dimension d = size();
String center = getParameter("center");
if (center != null){
Node n = panel.nodes[panel.findNode(center)];
n.x = d.width / 2;
n.y = d.height / 2;
n.fixed = true;
} // eif
} // ep
public void start() {
panel.start();
public void stop() {
panel.stop();
public boolean action(Event evt, Object arg) {
if (arg instanceof Boolean) {
if (((Checkbox)evt.target).getLabel().equals("Showit")) {
panel.showit = ((Boolean)arg).booleanValue();
}// e-
else {
panel.random = ((Boolean)arg).booleanValue();
return true;
} // e-if instof bool
if ("Reposition".equals(arg)) {
Dimension d = size();
for (int i = 0 ; i < panel.nnodes ; i++) {
//Node n = panel.nodes;
Node n = panel.nodes[i];
if (!n.fixed) {
n.x = 10 + (d.width-20)*Math.random();
n.y = 10 + (d.height-20)*Math.random();
} //ei
} //ef9
return true;
} //eif scram
if ("NewUrl".equals(arg)) {
Dimension d = size();
URL url = getCodeBase();
try {
getAppletContext().showDocument( new URL(url+"main.htm"), "_blank" );
try {
Thread.sleep(1000);
} catch (InterruptedException e) { }
} catch(MalformedURLException e) {
showStatus("814 URL not found");
for (int i = 0 ; i < panel.nnodes ; i++) {
//Node n = panel.nodes;
Node n = panel.nodes[i];
if (!n.fixed) {
n.x += (80*0.02) - 40;
n.y += (80*0.02) - 40;
return true;
} //ei
return false; -
Floating "boxes" applet with drag events need ckick events
I Have an applet cobbled from the net & modified. Is works but needs one major event added. It draws "Graphics.drawline" boxes with a text "String" inside each box ( the text string represents an URL location). These "boxes" are objects which are "draggable to other locations on canvas & therefore can be independently positioned by user. Each box redraws itself periodically to a slightly different screen location & becomes stationary after a 5 or 6 seconds. The point is, all of this "drag & mobility" behavior must remain intact & is not part of the "problem task".
Task: Need to have an "event" behavior added in one of two ways ( or a 3rd way if there is another ) whichever is quickest/ easiest. "Clickable mouse events" must be added to each box. ( boxes are built in a loop so adding to one will add to other locations & create as many "buttons" as there are boxes) . At each box's location, clicking one box should be an event which fires & clicking a different box should be a separate event which fires. Separate , so that URL location can be "hotlinked" to each box. That URL is currently displayed in the boxes (visible when running applet).
1st possible solution: Exchange these "boxes" which appear on canvas into clickable event "Graph panel.buttons" ( for example or some other clickable object) which maintains existing "drag" behavior of boxes. These buttons must each have "clickability" with mouse events to enable placing "getAppletContext. showDocument()" code with these events ( e.g., "hotlinked" to http locations).
or
2nd possible solution:. The drawstring boxes are currently dead string text with no event model other than the "drag" feature associated with each box. Must add an additional mouse event behavior to existing boxes so they are "clickable" ( or text inside is clickable) and can then execute "showDocument()" URL when clicked independently.
Maybe there is a #3. I don't know what that would be. Open to try anything without losing the drag & placement mobility of existing boxes.
These "boxes" could be images, or event buttons - doesnt matter.
Not sure if #2 is possible & have not been able to accomplish #1. Must stay within existing AWT framework so IE browsers can run it natively ( which of course IE cannot run Swing graphics unless a Sun plugin loaded ).
Applet is a single file ( creating 4 classes).
html file (which invokes it) passes a string param which is broken into above noted URL strings in each box.
Running this applet, you see a "button" event ( at base of canvas labeled "NewUrl" ) which pops up an url location when clicked ( using "showdocument"). This button is not attached to locations or text of each box object ( which is the "task" to accomplish) . The button does represent the kind of event behavior which each "box" should have when task is achieved. So the box can be exchanged with buttons or the boxes can be imbued with events to hyperlink like a button.
In spirit of solution #1, here is the bonehead attempt I tried which did not work: copied entire "if" block of logic from the button event (sited in preceding paragraph) into region of code which builds boxes ( "for" loop of "drawstring" method).
"g.drawString(doit, x - (w-10)/2, (y - (h-4)/2) + fm.getAscent());"
I copied all the "if" block of logic for button creation into the area immediately after the above line ( for loop which builds the boxes). Hoping that I could create buttons with events, along with all the boxes (which are getting created using "drawstring" above in a "for" loop). These "buttons" must also have positioning info of each box to appear in different locations on the canvas. Positioning data is not in that "if" block of code but it would have been a start to get the multiple buttons created ( even if all drawn in one spot). The "if" code block I've provieded for an example begins with the line:
" if ("NewUrl".equals(arg)) { "
and ends with with lines:
" return true; "
" } " //< -- end of above if block
This full "if" block can be seen in the listing below:
This "if" block creates the "NewUrl" button. Of course, I got a bunch of errors when I tried to copy this block to the above location:
variable: "arg" "not found in class GraphPanel".
methods: "getcodebase, showstatus, getappletcontext()"
"not found in class GraphPanel".
----------- The applet code in total follows next
Here are both the java & htm complete source.
import java.net.MalformedURLException;
import java.net.URL;
import java.net.*;
import java.util.*;
import java.awt.*;
import java.applet.Applet;
import java.applet.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.*;
class Node {
double x;
double y;
double dx;
double dy;
boolean fixed;
String lbl;
class Edge {
int from;
int to;
double len;
} // eEdgeCla
class GraphPanel extends Panel implements Runnable {
Box box;
int nnodes;
Node nodes[] = new Node[100];
int nedges;
Edge edges[] = new Edge[200];
Thread relaxer;
boolean showit;
boolean random;
GraphPanel(Box box) {
this.box = box;
} //ebox
int findNode(String lbl) {
for (int i = 0 ; i < nnodes ; i++) {
if (nodes.lbl.equals(lbl)) {
return i;
return addNode(lbl);
int addNode(String lbl) {
Node n = new Node();
n.x = 10 + 380*Math.random();
n.y = 10 + 380*Math.random();
n.lbl = lbl;
nodes[nnodes] = n;
return nnodes++;
void addEdge(String from, String to, int len) {
Edge e = new Edge();
e.from = findNode(from);
e.to = findNode(to);
e.len = len;
edges[nedges++] = e;
public void run() {
int i3=0;
while (true) {
relax();
if (random && (Math.random() < 0.03)) {
Node n = nodes[(int) (1 * nnodes) ]; // no
if (!n.fixed) {
n.x += (100*0.02) - 50;
n.y += (100*0.02) - 50; //
try {
Thread.sleep(4000);
} catch (InterruptedException e) {
break;
i3++;
} //ew
} // epublrun()
synchronized void relax() {
for (int i = 0 ; i < nedges ; i++) {
Edge e = edges;
double vx = nodes[e.to].x - nodes[e.from].x;
double vy = nodes[e.to].y - nodes[e.from].y;
double len = Math.sqrt(vx * vx + vy * vy);
double f = (edges.len - len) / (len * 3) ;
double dx = f * vx;
double dy = f * vy;
nodes[e.to].dx += dx;
nodes[e.to].dy += dy;
nodes[e.from].dx += -dx;
nodes[e.from].dy += -dy;
} //efo
for (int i = 0 ; i < nnodes ; i++) {
Node n1 = nodes;
double dx = 0;
double dy = 0;
for (int j = 0 ; j < nnodes ; j++) {
if (i == j) {
continue;
Node n2 = nodes[j];
double vx = n1.x - n2.x;
double vy = n1.y - n2.y;
double len = vx * vx + vy * vy;
if (len == 0) {
dx += 0.02;
dy += 0.02;
} else if (len < 100*100) {
dx += vx / len;
dy += vy / len;
} //ef3a
double dlen = dx * dx + dy * dy;
if (dlen > 0) {
dlen = Math.sqrt(dlen) / 2;
n1.dx += dx / dlen;
n1.dy += dy / dlen;
} //ef3
Dimension d = size();
// f4
for (int i = 0 ; i < nnodes ; i++) {
Node n = nodes;
if (!n.fixed) {
n.x += Math.max(-5, Math.min(5, n.dx));
n.y += Math.max(-5, Math.min(5, n.dy));
if (n.x < 0) {
n.x = 0;
} else if (n.x > d.width) {
n.x = d.width;
if (n.y < 0) {
n.y = 0;
} else if (n.y > d.height) {
n.y = d.height;
n.dx /= 2;
n.dy /= 2;
repaint();
Node pick;
boolean pickfixed;
Image offscreen;
Dimension offscreensize;
Graphics offgraphics;
final Color fixedColor = Color.green;
final Color selectColor = Color.gray;
final Color edgeColor = Color.black;
final Color nodeColor = new Color(200, 90, 50);
final Color showitColor = Color.gray;
final Color arcColor1 = Color.black;
final Color arcColor2 = Color.orange;
final Color arcColor3 = Color.blue;
public void paintNode( Graphics g, Node n, FontMetrics fm) {
int x = (int)n.x;
int y = (int)n.y;
g.setColor((n == pick) ? selectColor : (n.fixed ? fixedColor : nodeColor));
int w = fm.stringWidth(n.lbl) + 10;
int h = fm.getHeight() + 4;
g.fillRect(x - w/2, y - h / 2, w, h);
g.setColor(Color.black);
g.drawRect(x - w/2, y - h / 2, w-1, h-1);
String doit = n.lbl.replace('x','/');
g.drawString(doit, x - (w-10)/2, (y - (h-4)/2) + fm.getAscent());
} // epa
public synchronized void update(Graphics g) {
Dimension d = size();
if ((offscreen == null) || (d.width != offscreensize.width) || (d.height != offscreensize.height)) {
offscreen = createImage(d.width, d.height);
offscreensize = d;
offgraphics = offscreen.getGraphics();
offgraphics.setFont(getFont());
offgraphics.setColor(getBackground());
offgraphics.fillRect(0, 0, d.width, d.height);
for (int i = 0 ; i < nedges ; i++) {
Edge e = edges;
int x1 = (int)nodes[e.from].x;
int y1 = (int)nodes[e.from].y;
int x2 = (int)nodes[e.to].x;
int y2 = (int)nodes[e.to].y;
int len = (int)Math.abs(Math.sqrt((x1-x2)*(x1-x2) + (y1-y2)*(y1-y2)) - e.len);
offgraphics.setColor((len < 10) ? arcColor1 : (len < 20 ? arcColor2 : arcColor3)) ;
offgraphics.drawLine(x1, y1, x2, y2);
if (showit) {
String lbl = String.valueOf(len);
offgraphics.setColor(showitColor);
offgraphics.drawString("href= http://localhost:"+lbl, x1 + (x2-x1)/2, y1 + (y2-y1)/2);
offgraphics.setColor(edgeColor);
} //ef5
FontMetrics fm = offgraphics.getFontMetrics();
for (int i = 0 ; i < nnodes ; i++) {
paintNode( offgraphics, nodes, fm); //or
g.drawImage(offscreen, 0, 0, null);
public synchronized boolean mouseDown(Event evt, int x, int y) {
double bestdist = Double.MAX_VALUE;
for (int i = 0 ; i < nnodes ; i++) {
Node n = nodes;
double dist = (n.x - x) * (n.x - x) + (n.y - y) * (n.y - y);
if (dist < bestdist) {
pick = n;
bestdist = dist;
pickfixed = pick.fixed;
pick.fixed = true;
pick.x = x;
pick.y = y;
repaint();
return true;
public synchronized boolean mouseDrag(Event evt, int x, int y) {
pick.x = x;
pick.y = y;
repaint();
return true;
} //e-pubsyncmousedrag
public synchronized boolean mouseUp(Event evt, int x, int y) {
pick.x = x;
pick.y = y;
pick.fixed = pickfixed;
pick = null;
repaint();
return true;
public void start() {
relaxer = new Thread(this);
relaxer.start();
public void stop() {
relaxer.stop();
public class Box extends Applet {
GraphPanel panel;
public void init() {
setLayout(new BorderLayout());
panel = new GraphPanel(this);
add("Center", panel);
Panel p = new Panel();
add("South", p);
p.add(new Button("Reposition"));
p.add(new Button("NewUrl"));
p.add(new Checkbox("Showit"));
String edges = getParameter("edges"); // putinli
for (StringTokenizer t = new StringTokenizer(edges, ",") ; t.hasMoreTokens() ; ) {
String str = t.nextToken();
int i = str.indexOf('-');
if (i > 0) { int len = 50;
int j = str.indexOf('/');
if (j > 0) {
len = Integer.valueOf(str.substring(j+1)).intValue();
str = str.substring(0, j);
panel.addEdge(str.substring(0,i), str.substring(i+1), len);
} //ef8
Dimension d = size();
String center = getParameter("center");
if (center != null){
Node n = panel.nodes[panel.findNode(center)];
n.x = d.width / 2;
n.y = d.height / 2;
n.fixed = true;
} // eif
} // ep
public void start() {
panel.start();
public void stop() {
panel.stop();
public boolean action(Event evt, Object arg) {
if (arg instanceof Boolean) {
if (((Checkbox)evt.target).getLabel().equals("Showit")) {
panel.showit = ((Boolean)arg).booleanValue();
}// e-
else {
panel.random = ((Boolean)arg).booleanValue();
return true;
} // e-if instof bool
if ("Reposition".equals(arg)) {
Dimension d = size();
for (int i = 0 ; i < panel.nnodes ; i++) {
Node n = panel.nodes;
if (!n.fixed) {
n.x = 10 + (d.width-20)*Math.random();
n.y = 10 + (d.height-20)*Math.random();
} //ei
} //ef9
return true;
} //eif scram
if ("NewUrl".equals(arg)) {
Dimension d = size();
URL url = getCodeBase();
try {
getAppletContext().showDocument( new URL(url+"main.htm"), "_blank" );
try {
Thread.sleep(1000);
} catch (InterruptedException e) { }
} catch(MalformedURLException e) {
showStatus("814 URL not found");
for (int i = 0 ; i < panel.nnodes ; i++) {
Node n = panel.nodes;
if (!n.fixed) {
n.x += (80*0.02) - 40;
n.y += (80*0.02) - 40;
return true;
} //ei
return false;
-----------------------htm file to launch------------------------------
<html>
<head>
<title>R
</title>
</head>
<body>
<h3>
<center>
R
</center>
</h3>
I
<b>
</b>
<table border = 1>
<td>De<td>Test List<tr>
<td>N <td><tr>
<td>N <td><tr>
</table>
<b>view </b>
<applet code="Box.class" CODEBASE=. width=1000 height=600
ALT="Test ">
<param name=edges value="http:xxabc.htm-http:xxnet.htm,http:xxthis.htm-http:xx.comet.htm,http:xxnewsighting.htm-http:xxstar.htm,http:xxmoon.htm-http:xxNeptune.htm">
<hr>
</applet>
</b>
<p>
<table border = 1>
<tr>
<tr>
</table>
</html>
</body>
instructions to compile :
0 : The discussion becomes easy to follow after 1st compiling
& viewing the applet.
1. : cut out applet code.
2. : the post somehow deleted all references to "" <--- HERE
see, the data has been deleted again as I preview this post.
( that "" should contain an "i" array increment argument:
"open square bracket" "i" "close square bracket" ) array
so "javac Box.java" will get 10 errors. These "[" "i" "]"
array args must be replaced to compile the code.
3. : All array variables inside the 10 "for" loops ( the bare words
"edges" and "nodes" ) without array increment "i" should
read "edges" "[" "i" "]" & "nodes" "[" "i" "]".
The 10 location lines are approx:
line #65, #129, #136, #149, #195, #283, #311, #331, #477, #522
4. : These 10 edits reqresent a missing "i" to all 10 for loop arrays.
for eddges & nodes. fix this & javac Box.java" will get
4 class files.
5. : cut "Box.htm" from post & do "appletviewer Box.htm"
or put in an apache "htdoc" or tomcat "servlet" http delivered
directory & call "http://localhost/Box.htm.
6. : of course, selecting the event button "NewUrl" will not
work in appletviewer but will work in an http web location.
7. : post your questions to problem or fixes to problem as I'm
monitoring closely. TIA.Thanks for code post tip to fix array index deletion problem.
Here is code reposted using "code" delimiters which will
compile straight out of cut/paste.
import java.net.MalformedURLException;
import java.net.URL;
import java.net.*;
import java.util.*;
import java.awt.*;
import java.applet.Applet;
import java.applet.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.*;
class Node {
double x;
double y;
double dx;
double dy;
boolean fixed;
String lbl;
class Edge {
int from;
int to;
double len;
} // eEdgeCla
class GraphPanel extends Panel implements Runnable {
Box box;
int nnodes;
Node nodes[] = new Node[100];
int nedges;
Edge edges[] = new Edge[200];
Thread relaxer;
boolean showit;
boolean random;
GraphPanel(Box box) {
this.box = box;
} //ebox
int findNode(String lbl) {
for (int i = 0 ; i < nnodes ; i++) {
//if (nodes.lbl.equals(lbl)) {
if (nodes.lbl.equals(lbl)) {
return i;
return addNode(lbl);
int addNode(String lbl) {
Node n = new Node();
n.x = 10 + 380*Math.random();
n.y = 10 + 380*Math.random();
n.lbl = lbl;
nodes[nnodes] = n;
return nnodes++;
void addEdge(String from, String to, int len) {
Edge e = new Edge();
e.from = findNode(from);
e.to = findNode(to);
e.len = len;
edges[nedges++] = e;
public void run() {
int i3=0;
while (true) {
relax();
if (random && (Math.random() < 0.03)) {
Node n = nodes[(int) (1 * nnodes) ]; // no
if (!n.fixed) {
n.x += (100*0.02) - 50;
n.y += (100*0.02) - 50; //
try {
Thread.sleep(4000);
} catch (InterruptedException e) {
break;
i3++;
} //ew
} // epublrun()
synchronized void relax() {
for (int i = 0 ; i < nedges ; i++) {
//Edge e = edges;
Edge e = edges[i];
double vx = nodes[e.to].x - nodes[e.from].x;
double vy = nodes[e.to].y - nodes[e.from].y;
double len = Math.sqrt(vx * vx + vy * vy);
//double f = (edges.len - len) / (len * 3) ;
double f = (edges[i].len - len) / (len * 3) ;
double dx = f * vx;
double dy = f * vy;
nodes[e.to].dx += dx;
nodes[e.to].dy += dy;
nodes[e.from].dx += -dx;
nodes[e.from].dy += -dy;
} //efo
for (int i = 0 ; i < nnodes ; i++) {
//Node n1 = nodes[i];
Node n1 = nodes[i];
double dx = 0;
double dy = 0;
for (int j = 0 ; j < nnodes ; j++) {
if (i == j) {
continue;
Node n2 = nodes[j];
double vx = n1.x - n2.x;
double vy = n1.y - n2.y;
double len = vx * vx + vy * vy;
if (len == 0) {
dx += 0.02;
dy += 0.02;
} else if (len < 100*100) {
dx += vx / len;
dy += vy / len;
} //ef3a
double dlen = dx * dx + dy * dy;
if (dlen > 0) {
dlen = Math.sqrt(dlen) / 2;
n1.dx += dx / dlen;
n1.dy += dy / dlen;
} //ef3
Dimension d = size();
// f4
for (int i = 0 ; i < nnodes ; i++) {
//Node n = nodes;
Node n = nodes[i];
if (!n.fixed) {
n.x += Math.max(-5, Math.min(5, n.dx));
n.y += Math.max(-5, Math.min(5, n.dy));
if (n.x < 0) {
n.x = 0;
} else if (n.x > d.width) {
n.x = d.width;
if (n.y < 0) {
n.y = 0;
} else if (n.y > d.height) {
n.y = d.height;
n.dx /= 2;
n.dy /= 2;
repaint();
Node pick;
boolean pickfixed;
Image offscreen;
Dimension offscreensize;
Graphics offgraphics;
final Color fixedColor = Color.green;
final Color selectColor = Color.gray;
final Color edgeColor = Color.black;
final Color nodeColor = new Color(200, 90, 50);
final Color showitColor = Color.gray;
final Color arcColor1 = Color.black;
final Color arcColor2 = Color.orange;
final Color arcColor3 = Color.blue;
public void paintNode( Graphics g, Node n, FontMetrics fm) {
int x = (int)n.x;
int y = (int)n.y;
g.setColor((n == pick) ? selectColor : (n.fixed ? fixedColor : nodeColor));
int w = fm.stringWidth(n.lbl) + 10;
int h = fm.getHeight() + 4;
g.fillRect(x - w/2, y - h / 2, w, h);
g.setColor(Color.black);
g.drawRect(x - w/2, y - h / 2, w-1, h-1);
String doit = n.lbl.replace('x','/');
g.drawString(doit, x - (w-10)/2, (y - (h-4)/2) + fm.getAscent());
} // epa
public synchronized void update(Graphics g) {
Dimension d = size();
if ((offscreen == null) || (d.width != offscreensize.width) || (d.height != offscreensize.height)) {
offscreen = createImage(d.width, d.height);
offscreensize = d;
offgraphics = offscreen.getGraphics();
offgraphics.setFont(getFont());
offgraphics.setColor(getBackground());
offgraphics.fillRect(0, 0, d.width, d.height);
for (int i = 0 ; i < nedges ; i++) {
//Edge e = edges;
Edge e = edges[i];
int x1 = (int)nodes[e.from].x;
int y1 = (int)nodes[e.from].y;
int x2 = (int)nodes[e.to].x;
int y2 = (int)nodes[e.to].y;
int len = (int)Math.abs(Math.sqrt((x1-x2)*(x1-x2) + (y1-y2)*(y1-y2)) - e.len);
offgraphics.setColor((len < 10) ? arcColor1 : (len < 20 ? arcColor2 : arcColor3)) ;
offgraphics.drawLine(x1, y1, x2, y2);
if (showit) {
String lbl = String.valueOf(len);
offgraphics.setColor(showitColor);
offgraphics.drawString("href= http://localhost:"+lbl, x1 + (x2-x1)/2, y1 + (y2-y1)/2);
offgraphics.setColor(edgeColor);
} //ef5
FontMetrics fm = offgraphics.getFontMetrics();
for (int i = 0 ; i < nnodes ; i++) {
//paintNode( offgraphics, nodes, fm); //or
paintNode( offgraphics, nodes[i], fm); //or
g.drawImage(offscreen, 0, 0, null);
public synchronized boolean mouseDown(Event evt, int x, int y) {
double bestdist = Double.MAX_VALUE;
for (int i = 0 ; i < nnodes ; i++) {
//Node n = nodes;
Node n = nodes[i];
double dist = (n.x - x) * (n.x - x) + (n.y - y) * (n.y - y);
if (dist < bestdist) {
pick = n;
bestdist = dist;
pickfixed = pick.fixed;
pick.fixed = true;
pick.x = x;
pick.y = y;
repaint();
return true;
public synchronized boolean mouseDrag(Event evt, int x, int y) {
pick.x = x;
pick.y = y;
repaint();
return true;
} //e-pubsyncmousedrag
public synchronized boolean mouseUp(Event evt, int x, int y) {
pick.x = x;
pick.y = y;
pick.fixed = pickfixed;
pick = null;
repaint();
return true;
public void start() {
relaxer = new Thread(this);
relaxer.start();
public void stop() {
relaxer.stop();
public class Box extends Applet {
GraphPanel panel;
public void init() {
setLayout(new BorderLayout());
panel = new GraphPanel(this);
add("Center", panel);
Panel p = new Panel();
add("South", p);
p.add(new Button("Reposition"));
p.add(new Button("NewUrl"));
p.add(new Checkbox("Showit"));
String edges = getParameter("edges"); // putinli
for (StringTokenizer t = new StringTokenizer(edges, ",") ; t.hasMoreTokens() ; ) {
String str = t.nextToken();
int i = str.indexOf('-');
if (i > 0) { int len = 50;
int j = str.indexOf('/');
if (j > 0) {
len = Integer.valueOf(str.substring(j+1)).intValue();
str = str.substring(0, j);
panel.addEdge(str.substring(0,i), str.substring(i+1), len);
} //ef8
Dimension d = size();
String center = getParameter("center");
if (center != null){
Node n = panel.nodes[panel.findNode(center)];
n.x = d.width / 2;
n.y = d.height / 2;
n.fixed = true;
} // eif
} // ep
public void start() {
panel.start();
public void stop() {
panel.stop();
public boolean action(Event evt, Object arg) {
if (arg instanceof Boolean) {
if (((Checkbox)evt.target).getLabel().equals("Showit")) {
panel.showit = ((Boolean)arg).booleanValue();
}// e-
else {
panel.random = ((Boolean)arg).booleanValue();
return true;
} // e-if instof bool
if ("Reposition".equals(arg)) {
Dimension d = size();
for (int i = 0 ; i < panel.nnodes ; i++) {
//Node n = panel.nodes;
Node n = panel.nodes[i];
if (!n.fixed) {
n.x = 10 + (d.width-20)*Math.random();
n.y = 10 + (d.height-20)*Math.random();
} //ei
} //ef9
return true;
} //eif scram
if ("NewUrl".equals(arg)) {
Dimension d = size();
URL url = getCodeBase();
try {
getAppletContext().showDocument( new URL(url+"main.htm"), "_blank" );
try {
Thread.sleep(1000);
} catch (InterruptedException e) { }
} catch(MalformedURLException e) {
showStatus("814 URL not found");
for (int i = 0 ; i < panel.nnodes ; i++) {
//Node n = panel.nodes;
Node n = panel.nodes[i];
if (!n.fixed) {
n.x += (80*0.02) - 40;
n.y += (80*0.02) - 40;
return true;
} //ei
return false; -
CTD bug in simple video streaming applet.
I'm trying to write a simple applet to use JMF to allow an end-user to view a video stream that's being served up by VLC. It doesn't have to look immensely pretty (in fact, streamlined is what I want most). I swiped some code from the jicyshout project (http://jicyshout.sourceforge.net) which handles streaming MP3s, and borrowed a framework for an applet from one of Sun's example applets for the JMF.
Here's my code so far:
** begin file SimpleVideoDataSource.java **
import java.lang.String;
import java.net.*;
import java.io.*;
import java.util.Properties;
import javax.media.*;
import javax.media.protocol.*;
/* The SeekableStream and DataSource tweaks are based on the code from
* jicyshout (jicyshout.sourcefourge.net), which was written by Chris Adamson.
* The code was simplified (no need for mp3 metadata here), cleaned up, then
* extended for our puposes.
* This is a DataSource using a SeekableStream suitable for
* streaming video using the default parser supplied by JMF.
public class SimpleVideoDataSource extends PullDataSource {
protected MediaLocator myML;
protected SeekableInputStream[] seekStreams;
protected URLConnection urlConnection;
// Constructor (trivial).
public SimpleVideoDataSource (MediaLocator ml) throws MalformedURLException {
super ();
myML = ml;
URL url = ml.getURL();
public void connect () throws IOException {
try {
URL url = myML.getURL();
urlConnection = url.openConnection();
// Make the stream seekable, so that the JMF parser can try to parse it (instead
// of throwing up).
InputStream videoStream = urlConnection.getInputStream();
seekStreams = new SeekableInputStream[1];
seekStreams[0] = new SeekableInputStream(videoStream);
} catch (MalformedURLException murle) {
throw new IOException ("Malformed URL: " + murle.getMessage());
} catch (ArrayIndexOutOfBoundsException aioobe) {
fatalError("Array Index OOB: " + aioobe);
// Closes up InputStream.
public void disconnect () {
try {
seekStreams[0].close();
} catch (IOException ioe) {
System.out.println ("Can't close stream. Ew?");
ioe.printStackTrace();
// Returns just what it says.
public String getContentType () {
return "video.mpeg";
// Does nothing, since this is a stream pulled from PullSourceStream.
public void start () {
// Ditto.
public void stop () {
// Returns a one-member array with the SeekableInputStream.
public PullSourceStream[] getStreams () {
try {
// **** This seems to be the problem. ****
if (seekStreams != null) {
return seekStreams;
} else {
fatalError("sourceStreams was null! Bad kitty!");
return seekStreams;
} catch (Exception e) {
fatalError("Error in getStreams(): " + e);
return seekStreams;
// Duration abstract stuff. Since this is a theoretically endless stream...
public Time getDuration () {
return DataSource.DURATION_UNBOUNDED;
// Controls abstract stuff. No controls supported here!
public Object getControl (String controlName) {
return null;
public Object[] getControls () {
return null;
void fatalError (String deathKnell) {
System.err.println(":[ Fatal Error ]: - " + deathKnell);
throw new Error(deathKnell);
** end file SimpleVideoDataSource.java **
** begin file SeekableInputStream.java **
import java.lang.String;
import java.net.*;
import java.io.*;
import java.util.Properties;
import javax.media.*;
import javax.media.protocol.*;
/* The SeekableStream and DataSource tweaks are based on the code from
* jicyshout (jicyshout.sourcefourge.net), which was written by Chris Adamson.
* The code was simplified (no need for mp3 metadata here), cleaned up, then
* extended for our puposes.
/* This is an implementation of a SeekableStream which extends a
* BufferedInputStream to basically fake JMF into thinking that
* the stream is seekable, when in fact it's not. Basically, this
* will keep JMF from puking over something it expects but can't
* actually get.
public class SeekableInputStream extends BufferedInputStream implements PullSourceStream, Seekable {
protected int tellPoint;
public final static int MAX_MARK = 131072; // Give JMF 128k of data to "play" with.
protected ContentDescriptor unknownCD;
// Constructor. Effectively trivial.
public SeekableInputStream (InputStream in) {
super (in, MAX_MARK);
tellPoint = 0;
mark (MAX_MARK);
unknownCD = new ContentDescriptor ("unknown");
// Specified size constructor.
public SeekableInputStream (InputStream in, int size) {
super (in, Math.max(size, MAX_MARK));
tellPoint = 0;
mark(Math.max(size, MAX_MARK));
unknownCD = new ContentDescriptor ("unknown");
// Reads a byte and increments tellPoint.
public int read () throws IOException {
int readByte = super.read();
tellPoint++;
return readByte;
// Reads bytes (specified by PullSourceStream).
public int read (byte[] buf, int off, int len) throws IOException {
int bytesRead = super.read (buf, off, len);
tellPoint += bytesRead;
return bytesRead;
public int read (byte[] buf) throws IOException {
int bytesRead = super.read (buf);
tellPoint += bytesRead;
return bytesRead;
// Returns true if in.available() <= 0 (that is, if there are no bytes to
// read without blocking or end-of-stream).
public boolean willReadBlock () {
try {
return (in.available() <= 0);
} catch (IOException ioe) {
// Stick a fork in it...
return true;
// Resets the tellPoint to 0 (meaningless after you've read one buffer length).
public void reset () throws IOException {
super.reset();
tellPoint = 0;
// Skips bytes as expected.
public long skip (long n) throws IOException {
long skipped = super.skip(n);
tellPoint += skipped;
return skipped;
// Trivial.
public void mark (int readLimit) {
super.mark (readLimit);
// Returns the "unknown" ContentDescriptor.
public ContentDescriptor getContentDescriptor () {
return unknownCD;
// Lengths? We don't need no stinkin' lengths!
public long getContentLength () {
return SourceStream.LENGTH_UNKNOWN;
// Theoretically, this is always false.
public boolean endOfStream () {
return false;
// We don't provide any controls, either.
public Object getControl (String controlName) {
return null;
public Object[] getControls () {
return null;
// Not really... but...
public boolean isRandomAccess () {
return true;
// This only works for the first bits of the stream, while JMF is attempting
// to figure out what the stream is. If it tries to seek after that, bad
// things are going to happen (invalid-mark exception).
public long seek (long where) {
try {
reset();
mark(MAX_MARK);
skip(where);
} catch (IOException ioe) {
ioe.printStackTrace();
return tell();
// Tells where in the stream we are, adjusted for seeks, resets, skips, etc.
public long tell () {
return tellPoint;
void fatalError (String deathKnell) {
System.err.println(":[ Fatal Error ]: - " + deathKnell);
throw new Error(deathKnell);
** end file SeekableInputStream.java **
** begin file StreamingViewerApplet.java **
* This Java Applet will take a streaming video passed to it via the applet
* command in the embedded object and attempt to play it. No fuss, no muss.
* Based on the SimplePlayerApplet from Sun, and uses a modified version of
* jicyshout's (jicyshout.sourceforge.net) tweaks to get JMF to play streams.
* Use it like this:
* <!-- Sample HTML
* <APPLET CODE="StreamingViewerApplet.class" WIDTH="320" HEIGHT="240">
* <PARAM NAME="code" VALUE="StreamingViewerApplet.class">
* <PARAM NAME="type" VALUE="application/x-java-applet;version=1.1">
* <PARAM NAME="streamwidth" VALUE="width (defaults to 320, but will resize as per video size)">
* <PARAM NAME="streamheight" VALUE="height (defaults to 240, but will resize as per video size)">
* <PARAM NAME="stream" VALUE="insert://your.stream.address.and:port/here/">
* </APPLET>
* -->
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
import java.lang.String;
import java.lang.ArrayIndexOutOfBoundsException;
import java.net.URL;
import java.net.MalformedURLException;
import java.net.*;
import java.io.*;
import java.io.IOException;
import java.util.Properties;
import javax.media.*;
import javax.media.protocol.*;
public class StreamingViewerApplet extends Applet implements ControllerListener {
Player player = null;
Component visualComponent = null;
SimpleVideoDataSource dataSource;
URL url;
MediaLocator ml;
Panel panel = null;
int width = 0;
static int DEFAULT_VIDEO_WIDTH = 320;
int height = 0;
static int DEFAULT_VIDEO_HEIGHT = 240;
String readParameter = null;
// Initialize applet, read parameters, create media player.
public void init () {
try {
setLayout(null);
setBackground(Color.white);
panel = new Panel();
panel.setLayout(null);
add(panel);
// Attempt to read width from applet parameters. If not given, use default.
if ((readParameter = getParameter("streamwidth")) == null) {
width = DEFAULT_VIDEO_WIDTH;
} else {
width = Integer.parseInt(readParameter);
// Ditto for height.
if ((readParameter = getParameter("streamheight")) == null) {
height = DEFAULT_VIDEO_HEIGHT;
} else {
height = Integer.parseInt(readParameter);
panel.setBounds(0, 0, width, height);
// Unfortunately, this we can't default.
if ((readParameter = getParameter("stream")) == null) {
fatalError("You must provide a stream parameter!");
try {
url = new URL(readParameter);
ml = new MediaLocator(url);
dataSource = new SimpleVideoDataSource(ml);
} catch (MalformedURLException murle) {
fatalError("Malformed URL Exception: " + murle);
try {
dataSource.connect();
player = Manager.createPlayer(dataSource);
} catch (IOException ioe) {
fatalError("IO Exception: " + ioe);
} catch (NoPlayerException npe) {
fatalError("No Player Exception: " + npe);
if (player != null) {
player.addControllerListener(this);
} else {
fatalError("Failed to init() player!");
} catch (Exception e) {
fatalError("Error opening player. Details: " + e);
// Start stream playback. This function is called the
// first time that the applet runs, and every time the user
// re-enters the page.
public void start () {
try {
if (player != null) {
player.realize();
while (player.getState() != Controller.Realized) {
Thread.sleep(100);
// Crashes... here?
player.start();
} catch (Exception e) {
fatalError("Exception thrown: " + e);
public void stop () {
if (player != null) {
player.stop();
player.deallocate();
} else {
fatalError("stop() called on a null player!");
public void destroy () {
// player.close();
// This controllerUpdate function is defined to implement a ControllerListener
// interface. It will be called whenever there is a media event.
public synchronized void controllerUpdate(ControllerEvent event) {
// If the player is dead, just leave.
if (player == null)
return;
// When the player is Realized, get the visual component and add it to the Applet.
if (event instanceof RealizeCompleteEvent) {
if (visualComponent == null) {
if ((visualComponent = player.getVisualComponent()) != null) {
panel.add(visualComponent);
Dimension videoSize = visualComponent.getPreferredSize();
width = videoSize.width;
height = videoSize.height;
visualComponent.setBounds(0, 0, width, height);
} else if (event instanceof CachingControlEvent) {
// With streaming, this doesn't really matter much, does it?
// Without, a progress bar of some sort would be appropriate.
} else if (event instanceof EndOfMediaEvent) {
// We should never see this... but...
player.stop();
fatalError("EndOfMediaEvent reached for streaming media. ewe ewe tea eff?");
} else if (event instanceof ControllerErrorEvent) {
player = null;
fatalError(((ControllerErrorEvent)event).getMessage());
} else if (event instanceof ControllerClosedEvent) {
panel.removeAll();
void fatalError (String deathKnell) {
System.err.println(":[ Fatal Error ]: - " + deathKnell);
throw new Error(deathKnell);
** end file StreamingViewerApplet.java **
Now, I'm still new to the JMF, so this might be obvious to some of you... but it's exploding on me, and crashing to desktop (both in IE and Firefox) with some very fun errors:
# An unexpected error has been detected by HotSpot Virtual Machine:
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x21217921, pid=3200, tid=3160
# Java VM: Java HotSpot(TM) Client VM (1.5.0_06-b05 mixed mode, sharing)
# Problematic frame:
# C 0x21217921
--------------- T H R E A D ---------------
Current thread (0x058f7280): JavaThread "JMF thread: com.sun.media.amovie.AMController@506411[ com.sun.media.amovie.AMController@506411 ] ( realizeThread)" [_thread_in_native, id=3160]
siginfo: ExceptionCode=0xc0000005, writing address 0x034e6360
(plenty more here, I can post the rest if necessary)
The problem seems to be coming from the "return seekStreams" statement in the first file; when I have execution aborted before that (with a fatalError call), it doesn't crash.
Any tips/hints/suggestions?You should write your own Applet, where you can easily get the visual component (getVisualComponent())and show it directly in your Applet (you call it "embedded"). As far as I know, all examples (AVReceive* etc.) use the component which opens a new window.
Best regards from Germany,
r.v. -
Load a second video into an applet: resize - stretch problem
Hello!
I have an applet that loads a movie (call it film_a.mov). The size of the movie is 320 x 240. Since I want to show it bigger, I use a BorderLayout that stretches the video depending on the size given by
the applet. In my case I set the applet parameter to "<applet code=Simple.class width=640 height=510>". Anyway, this display area is bigger than the actuell video size, so the video will be stretched.
Everytime a user clicks with the mouse pointer onto the video area the second movie (call it film_b.mov) replace the first movie. The setup for the BorderLayout has not be chance. I close the player before loading the second movie with a function called loadNewMovie(). I even call this.removeAll(), player.close() and player.removeControllerListener(this).
The problem is that if the second movie is loaded and placed into the vido display area it is not alway stretched to the possible BorderLayout.CENTER area. Sometimes it is stretched sometimes it is not streched. I really do not understand such behavior. It seems to me that I forget to call a update function that tells to stretch alway any video displayed.
Both movies have the same size. I tried to solve this problem by using setSize, setBounds, etc. on the visualComponent but this does not solve the problem. If you want to try out, here come the code:
mport java.applet.Applet;
import java.awt.*;
import java.lang.String;
import java.net.URL;
import java.net.MalformedURLException;
import java.io.IOException;
import javax.media.*;
// import com.sun.media.util.JMFSecurity;
* This is a Java Applet that demonstrates how to create a simple media player
* with a media event listener. It will play the media clip right away and
* continuously loop.
* <applet code=Simple.class width=640 height=510> <param
* name=file1 value="auto.mov"> <param name=file2 value="hongkong.mov">
public class Simple extends Applet implements ControllerListener {
private static final long serialVersionUID = 1L;
// media Player
Player player = null;
// component in which video is playing
Component visualComponent = null;
// controls gain, position, start, stop
Component controlComponent = null;
// displays progress during download
Component progressBar = null;
boolean firstTime = true;
long CachingSize = 0L;
int controlPanelHeight = 0;
int videoWidth = 0;
int videoHeight = 0;
MediaLocator mrl = null;
String mediaFile1 = null;
String mediaFile2 = null;
boolean closed = false;
* Read the applet file parameter and create the media player.
public void init() {
// $ System.out.println("Applet.init() is called");
setLayout(new BorderLayout());
setBackground(Color.red);
if ((mediaFile1 = getParameter("FILE1")) == null)
Fatal("Invalid media file parameter");
if ((mediaFile2 = getParameter("FILE2")) == null)
Fatal("Invalid media file parameter");
* Start media file playback. This function is called the first time that
* the Applet runs and every time the user re-enters the page.
public void start() {
// $ System.out.println("Applet.start() is called");
// Call start() to prefetch and start the player.
getMedia(mediaFile1);
if (player != null)
player.start();
setVisible(true);
* Stop media file playback and release resource before leaving the page.
public void stop() {
// $ System.out.println("Applet.stop() is called");
if (player != null) {
player.stop();
player.deallocate();
public void destroy() {
// $ System.out.println("Applet.destroy() is called");
player.close();
public void getMedia(String mediaFile) {
URL url = null;
try {
url = new URL(getDocumentBase(), mediaFile);
mediaFile = url.toExternalForm();
} catch (MalformedURLException mue) {
try {
// Create a media locator from the file name
if ((mrl = new MediaLocator(mediaFile)) == null)
Fatal("Can't build URL for " + mediaFile);
// Create an instance of a player for this media
try {
player = Manager.createPlayer(mrl);
} catch (NoPlayerException e) {
System.out.println(e);
Fatal("Could not create player for " + mrl);
// Add ourselves as a listener for a player's events
player.addControllerListener(this);
} catch (MalformedURLException e) {
Fatal("Invalid media file URL!");
} catch (IOException e) {
Fatal("IO exception creating player for " + mrl);
* This controllerUpdate function must be defined in order to implement a
* ControllerListener interface. This function will be called whenever there
* is a media event
public synchronized void controllerUpdate(ControllerEvent event) {
// If we're getting messages from a dead player,
// just leave
if (player == null)
return;
// When the player is Realized, get the visual
// and control components and add them to the Applet
if (event instanceof RealizeCompleteEvent) {
if (progressBar != null) {
remove(progressBar);
progressBar = null;
if ((controlComponent = player.getControlPanelComponent()) != null) {
controlPanelHeight = controlComponent.getPreferredSize().height;
add(BorderLayout.SOUTH, controlComponent);
validate();
if ((visualComponent = player.getVisualComponent()) != null) {
add(BorderLayout.CENTER, visualComponent);
validate();
visualComponent
.addMouseListener(new java.awt.event.MouseAdapter() {
public void mousePressed(
java.awt.event.MouseEvent evt) {
System.out
.println("MovieStreaming: mousePressed");
loadNewMovie(mediaFile2);
public void mouseReleased(
java.awt.event.MouseEvent evt) {
public void mouseEntered(
java.awt.event.MouseEvent evt) {
public void mouseExited(
java.awt.event.MouseEvent evt) {
} else if (event instanceof CachingControlEvent) {
if (player.getState() > Controller.Realizing)
return;
// Put a progress bar up when downloading starts,
// take it down when downloading ends.
CachingControlEvent e = (CachingControlEvent) event;
CachingControl cc = e.getCachingControl();
// Add the bar if not already there ...
if (progressBar == null) {
if ((progressBar = cc.getControlComponent()) != null) {
add(progressBar);
setSize(progressBar.getPreferredSize());
validate();
} else if (event instanceof EndOfMediaEvent) {
// We've reached the end of the media; rewind and
// start over
player.setMediaTime(new Time(0));
player.start();
} else if (event instanceof ControllerErrorEvent) {
// Tell TypicalPlayerApplet.start() to call it a day
player = null;
Fatal(((ControllerErrorEvent) event).getMessage());
} else if (event instanceof ControllerClosedEvent) {
closed = true;
public void closePlayer() {
synchronized (this) {
player.close();
while (!closed) {
try {
wait(100);
} catch (InterruptedException ie) {
player.removeControllerListener(this);
System.out.println("player is shutdown");
closed = false;
public void loadNewMovie(String mediaFile) {
// remove all components
closePlayer();
removeAll();
getMedia(mediaFile);
if (player != null)
player.start();
setVisible(true);
void Fatal(String s) {
// Applications will make various choices about what
// to do here. We print a message
System.err.println("FATAL ERROR: " + s);
throw new Error(s); // Invoke the uncaught exception
// handler System.exit() is another
// choice.
}As you may notice this code is basicly the SimplePlayerApplet example which I modified a bit.
Thank you for your Help
Matt2Sorry,
Can you tell me how do you solve it because I have got the same problem.
Can you indicate me the topic where did you find solution.
Thank in advance. -
Applet does not get client certificate from browser (Firefox, IE7)
I'm writing a web service which runs Tomcat through Apache. One critical requirement is that the service be able to invoke certain device drivers on the end user's machine. Fortunately, there is a Java API for this, so this requirement can be fulfilled using an applet.
Here's the problem. This is a B2B application, so we're using SSL and requiring client authentication. I'm no web security guru, but I managed to get SSL set up through Apache (with a self-signed certificate for now; we'll get a real one from a real CA when we're ready to go to production). I also managed to set up client authentication by creating my own CA and generating a client certificate, which I then copied to my test client (Win XPSP2) and imported into both Firefox (2.0.0.15) and IE (6.0.2900). The applet is signed with a real certificate, and that causes no problems. And all of the pages for my web service work as expected.
All except one. The page which is supposed to load the applet pops a dialog stating 'Identification required. Please select certificate to be used for authentication', and presents a list of zero certificates.
Actually, I get this dialog in Firefox on my XPSP2 box, and also when I test on a Vista Home Premium box running IE 7.0.6000. Puzzlingly, this behavior does NOT occur on my XPSP2 box when running through IE 6.0. It seems that with XPSP2 and IE 6.0, the JVM can manage to obtain the required client certificate from the browser and pass it along to Apache, but the JVM can't do this when running in Firefox or in IE 7.0 on Vista.
I have gone to the Java Control Panel and verified that the 'Use certificates and keys in browser keystore' option is selected on both boxes.
I've done a fair amount of research for this (including in this forum) and see that this appears to be a chronic difficulty with applets. What makes it worse is that I don't think I can use the standard workaround, which is to download the applet from a different host/virtual host, because the applet needs to communicate with the web service. Since we have the additional layer of Tomcat container-managed user authentication, the applet needs to be communicating with the server using the same session token as everything else.
So at this point, I'm stuck. Does anyone know a solution to this problem? Two thoughts (I'm reaching at straws here):
1) I have the certificate imported in both Firefox and IE as a 'personal' certificate. Is there someplace else I can put it so the JVM will know how to find it? A rather old thread in this forum mentioned something about setting properties in the Java Control Panel, but I see no place in the JCP to specify such properties, so I'm guessing that solution is no longer operative.
2) I'm using a trick I found on the internet to make the applet load cleanly with both Firefox and IE, namely, I'm using the <OBJECT> tag to specify the applet class and codebase for IE, and then using <COMMENT><EMBED ... /></COMMENT> within the <OBJECT> declaration to specify the information for Firefox. Is there some other way of doing the markup that will give the JVM a hint that it should get a certificate from the browser?
BTW . . . I would hate to drop support for Firefox, but if someone has an IE-only solution, I'll take it. Unfortunately, I reckon a Firefox-only solution would not fly.
Thanks all.My applet is also signed by a valid certificate. The question of whether the applet is signed/self-signed/unsigned >isn't an issue --- I just wanted you to make sure the Applet runs because it is a know valid Java2 Applet that is 100% signed properly and verified to run.
This eliminates the possibility that it is a JVM issue. However after reading your message further I am afraid
it is not relevant to your issue.
due to the client authentication, my browser (Firefox, IE7) refuses to even download the applet.
I went to your site, and I can see your applet in both Firefox and IE6. However, I don't believe your site is set up >quite like mine, because it appears I can run your applet whether I have imported your X509 certificate or not. What I >did was:If that is true we are all dead :) No I think you just missed the cert in the IE databse. It doesn't have to be in the
Applet database to function. Surprise!
Check your IE/tools/internet options/content tab/certificates/trusted root certification authorities.
I then opened the Java control panel and verified that the certificate isn't listed there, either. So unless the certificate >is being cached/read from some other location (which could be, this certificate stuff is largely black magic to me), >then your server isn't requiring client authentication, either accidentally or by design.No HyperView is a valid java2 Applet and actually writes to a file "hyperview.dat" though it is probably empty.
If you click on a component in the view and then on the view and type "dumpgobs" it shoud write out some data about the current graphics objects so you can see it has complete read/write access..
Further it opens up a complete NIO server ands starts listening for connections on a random port
(Echoed in your java console) You can connect to it with telnet and watch impressive ping messages all day :)
This all goes back to a few years BTW back before there was a plugin and there was only Netscape & IE.
There are actually 2 certificate databases and what loads where depends on which type of cert you are using. Now self signed or not doesn't matter but what does matter is the type of certificate. IE: is it RSA/DSA/Sha1
etc. The Netscape DB was a Berkley DB and MS used whatever they use. The Cert is a DSA/Sha1 cert
which I like the best ATM as it (X fingers it stays so) always has worked.
Sadly that tidbit doesn't help you either I am afraid.
What I'm trying to do is require client authentication through Apache by including the following markup in a virtual >host definition:
SSLCACertificateFile D:/Certificates/ca.crt
SSLVerifyClient require
SSLVerifyDepth 1You got me there I avoid markup at all costs and only code in C java and assembler :)
Now unless I am wrong I think you are saying that you want the Applet to push the certificate to the server
automatically and I don't think this happens. Least I have never heard of this happening from an Applet automatically.
On my client machine, I have a certificate which was generated using OpenSSL and the ca.crt file listed. Testing >shows that the server is requiring a certificate from the client, and the web browser is always providing it.
The problem is that when the browser fires up the Java plugin to run an applet, there is not sufficient communication >between the browser and the plugin so that the plugin can obtain the certificate from the browser and provide it to >the server.
So the server refuses to send the applet bytecode to the JVM, and we're stuck.In terms of implementation ease I think you may have the cart before the horse because I think it would be far easier to run an Applet in the first place to do the authentication, and then send, for example, a jar file to bootstrap and run
(or some classes) in the event the connection is valid. Then again one never knows it all and there may be some classes which enables the plugin as you wish. I have never heard of this being done with the plugin the way you suggest.
I am thinking maybe there is another method of doing this I do not know.
Did you try pushing the cert via JavaScript/LIveConnect?? That way it could run before the Applet and do the authentication.
Maybe someone else has other ideas; did you try the security forum??
Sorry but I am afraid that is not much help.
I did snarf this tidbit which may have some relevance
The current fix for this bug in Mantis and 1.4.1_02 is using JSSE API, Here are the step:
In Java control panel, Advanced tab -> Java Runtime Parameters, specify:
-Djavax.net.ssl.keyStore=<name and path to client keystore file>
-Djavax.net.ssl.keyStorePassword=<password to access this client keystore file>
If it is a PKCS12 format keystore, specify:
-Djavax.net.ssl.keyStoreType=PKCS12
In our future JRE release 1.5, we will create our own client authentication keystore file for JPI and use that for client authentication, for detail info, please see RFE 4797512.
Dennis
Posted Date : 2005-07-28 19:55:50.0Good Luck!
Sincerely:
(T)
Edited by: tswain on 23-Jul-2008 10:07 AM -
BigIP F5 : changing IP leads to cache invalidated and redownload of applet jars
Hello all,
In short, I'm trying to figure out how to have the java 7 plugin not considering the server IP to decide whether to use cached version of our applet's signed jars.
As suggested in the title, we use BigIP's F5 boxes to dispatch requests among actual servers, which are located in 2 different sites (disaster recovery purposes).
Each site has an F5 box ; and our DNS resolve the application's host name by alternating between 2 different IPs : one for site 1, the other for site 2.
Each time a user visits http://theapp.mycompany.com, the host is resolved as 9.9.9.1 or 9.9.9.2, more or less randomly.
This works very nicely as long as the applet is not concerned, or bandwith and latency is good enough to absorb 1.5Mb in a snap.
For remote subsidiaries (10.000km away from servers), downloading 1.5Mb takes 35s -- too much for the normal user to wait.
And the problem is : the plugin insists on looking up the server IP each time it starts up, and ignores cache entries that have been downloaded from a different IP.
Here is the use case :
- user connects to http://theapp.mycompany.com ; the browser get an IP, doesn't matter which ; user logs on, navigates in the app's html pages -- no problem
- user gets to the applet :
- the html page says
<applet id="myApplet">
<param name="archive" value="a.jar,b.jar,c.jar,d.jar,e.jar"/>
<param name="codebase_lookup" value="false"/>
<param name="archive_1" value="a.jar, preload, version=7.5.7" />
<param name="archive_2" value="b.jar, preload, version=7.5.7" />
<param name="archive_3" value="c.jar, preload, version=7.5.7" />
<param name="archive_4" value="d.jar, preload, version=7.5.7" />
<param name="archive_5" value="e.jar, preload, version=7.5.7" />
<param name="baseUrl" value="/"/>
<param name="code" value="a/package/for/Applet.class"/>
<param name="mayscript" value="mayscript"/>
<param name="codebase" value="/applet/"/>
<param name="name" value="MyApplet" />"
<param name="locale" value="fr"/>
</applet>
The archive_n parameters are here in an attempt to tell the plugin to not even ask for jars if its cache contains entries with same host/same name/same version.
The version is assigned at build time at an application level ; it has nothing to do with the Implementation-Version attribute found in MANIFEST.MF files.
- Java and the plugin sarts up : let's assume this is the first time : cache is empty : all jars are downloaded ; as they are signed and the CA certificate chain was set in the browser config, and the java.policy is also configured to allow smooth exec, the applet runs smoothly -- after a long startup delay
- user leaves the applet, do some stuff in other applet-less pages for some minutes (the java/plugin processes are shut down after a minute or so)
- user reenters the page that contains the applet
- Java and the plugin start up again :
- the cache has entries for each jar : host, name, version are all ok.
- But : the jars are not seen as "prevalidated" ; heres' the applet log ( in French, translation provided after "//") :
network: Vérification de version pour a.jar. La version spécifiée est 7.5.7 //Checking version for a.jar. Specified version is 7.5.7
security: La vérification de révocation de la liste noire est activée // Check of blacklist revocation is activated
security: blacklist: created: NEED_LOAD, lastModified: 1378474147992
security: blacklist: hasBeenModifiedSince 1380806409906 (we have 1378474147992)
security: La vérification de liste de bibliothèques sécurisées est activée // Check of trusted libraries is activated
..... same for the other jars ....
network: Created version ID: 7.5.7
network: Created version ID: 7.5.7
network: Entrée de cache trouvée [URL : http://theapp.mycompany.com/applet/a.jar, version : 7.5.7] prevalidated=false/0 //Cache entry found
cache: Adding MemoryCache entry: http://sandbox-mosaic.jcdecaux.com/applet/plannerApplet_7.5.7.jar
network: Created version ID: 7.5.7
- The plugin then tries to lookup the host IP to check whether it matches that seen when creating the entry
- 2 possibilities here :
- the IP returned is the same : the plugin is happy, uses the cached jar, no question/download to/from the server, and the applet starts up quick and runs ok
- the IP returned is not the same ; the plugin says :
network: Vérification de version pour a.jar. La version spécifiée est 7.5.7 //Checking version for a.jar. Specified version is 7.5.
security: blacklist: created: NEED_LOAD, lastModified: 1378474147992
security: blacklist: hasBeenModifiedSince 1380806409906 (we have 1378474147992)
security: La vérification de liste de bibliothèques sécurisées est activée // Check of trusted libraries is activated
cache: CacheEntry IP mismatch: 9.9.9.1 != 9.9.9.2
and then it downloads again the jar.
Of course, all the jars are treated the same way.
Note that the applet eventually runs normally ; the only problem is that the cache essentially doesn't work, causing terribly annoying 35s delays at applet startup.
Interestingly enough, examining the jdk 6 code shows that the "prevalidated=false" fragment (in bold/pink above) means that the method CacheEntry.isKnownToBeSigned() returns false.
I tried with a self-signed certificate which I added first in IE as "Trusted publisher" ; I also tried with a certificate signed by a CA that is known by IE -- no help.
So I really wonder : what does it take to have the plugin consider that each jar "isKnownToBeSigned" ?
Any thoughts ?
Note : we of course are considering packing jars, cleaning dead code, etc. to decrease applet size. But it doesn't help with the fact that the plugin considers the IP, which it shouldn't do in our case. And even with pack200 we're left with +350Kb of unnecessary downloads, not counting with future code to be developped ...
Thanks for any feedback
David
Browser is IE7.
Complete dump of system properties :
__applet_launched = 280874909499
__jvm_launched = 280874910680
acl.read = +
acl.read.default =
acl.write = +
acl.write.default =
awt.toolkit = sun.awt.windows.WToolkit
browser = sun.plugin
browser.vendor = Oracle
browser.version = 1.1
file.encoding = Cp1252
file.encoding.pkg = sun.io
file.separator = \
file.separator.applet = true
http.agent = Mozilla/4.0 (Windows Vista 6.0)
http.auth.serializeRequests = true
https.protocols = TLSv1,SSLv3
java.awt.graphicsenv = sun.awt.Win32GraphicsEnvironment
java.awt.printerjob = sun.awt.windows.WPrinterJob
java.class.path = C:\tools\Java\jre7\classes
java.class.version = 51.0
java.class.version.applet = true
java.endorsed.dirs = C:\tools\Java\jre7\lib\endorsed
java.ext.dirs = C:\tools\Java\jre7\lib\ext;C:\Windows\Sun\Java\lib\ext
java.home = C:\tools\Java\jre7
java.io.tmpdir = C:\Users\taille\AppData\Local\Temp\
java.library.path = C:\tools\Java\jre7\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\Program Files\Internet Explorer;;C:\oracle\ORA102\bin;C:\Perl\site\bin;C:\Perl\bin;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;c:\Program Files\Common Files\Roxio Shared\DLLShared\;C:\Program Files\JavaSoft\JRE\1.3.1_06\bin;C:\ORACLE\Ora92\jre\1.3.1\bin;C:\ORACLE\Ora92\jre\1.1.8\bin;C:\tools\Groovy-1.7.5\bin;C:\tools\Graphviz2.28\bin;C:\tools\Git\cmd;C:\tools\tortoiseSVN\bin;C:\Program Files\Windows Imaging\;C:\oracle\ORA102\bin;C:\Perl\site\bin;C:\Perl\bin;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;c:\Program Files\Common Files\Roxio Shared\DLLShared\;C:\Program Files\JavaSoft\JRE\1.3.1_06\bin;C:\ORACLE\Ora92\jre\1.3.1\bin;C:\ORACLE\Ora92\jre\1.1.8\bin;C:\tools\Groovy-1.7.5\bin;C:\tools\Graphviz2.28\bin;C:\tools\Git\cmd;C:\tools\tortoiseSVN\bin;C:\Program Files\Windows Imaging\;.
java.protocol.handler.pkgs = sun.plugin.net.protocol|com.sun.deploy.net.protocol
java.rmi.server.RMIClassLoaderSpi = sun.plugin2.applet.JNLP2RMIClassLoaderSpi
java.runtime.name = Java(TM) SE Runtime Environment
java.runtime.version = 1.7.0_21-b11
java.specification.name = Java Platform API Specification
java.specification.vendor = Oracle Corporation
java.specification.version = 1.7
java.vendor = Oracle Corporation
java.vendor.applet = true
java.vendor.url = http://java.oracle.com/
java.vendor.url.applet = true
java.vendor.url.bug = http://bugreport.sun.com/bugreport/
java.version = 1.7.0_21
java.version.applet = true
java.vm.info = mixed mode, sharing
java.vm.name = Java HotSpot(TM) Client VM
java.vm.specification.name = Java Virtual Machine Specification
java.vm.specification.vendor = Oracle Corporation
java.vm.specification.version = 1.7
java.vm.vendor = Oracle Corporation
java.vm.version = 23.21-b01
javaplugin.nodotversion = 10212
javaplugin.version = 10.21.2.11
javaplugin.vm.options = -Ddeployment.trace.level=all -Duser.language=en
javawebstart.version = javaws-10.21.2.11
line.separator = \r\n
line.separator.applet = true
mrj.version.applet = true
os.arch = x86
os.arch.applet = true
os.name = Windows Vista
os.name.applet = true
os.version = 6.0
os.version.applet = true
package.restrict.access.com.sun.deploy = true
package.restrict.access.netscape = false
package.restrict.access.org.mozilla.jss = true
package.restrict.access.sun = true
package.restrict.definition.com.sun.deploy = true
package.restrict.definition.java = true
package.restrict.definition.netscape = true
package.restrict.definition.org.mozilla.jss = true
package.restrict.definition.sun = true
path.separator = ;
path.separator.applet = true
sun.arch.data.model = 32
sun.awt.enableExtraMouseButtons = true
sun.awt.warmup = true
sun.boot.class.path = C:\tools\Java\jre7\lib\resources.jar;C:\tools\Java\jre7\lib\rt.jar;C:\tools\Java\jre7\lib\sunrsasign.jar;C:\tools\Java\jre7\lib\jsse.jar;C:\tools\Java\jre7\lib\jce.jar;C:\tools\Java\jre7\lib\charsets.jar;C:\tools\Java\jre7\lib\jfr.jar;C:\tools\Java\jre7\classes;C:\tools\Java\jre7\lib\deploy.jar;C:\tools\Java\jre7\lib\javaws.jar;C:\tools\Java\jre7\lib\plugin.jar
sun.boot.library.path = C:\tools\Java\jre7\bin
sun.cpu.endian = little
sun.cpu.isalist = pentium_pro+mmx pentium_pro pentium+mmx pentium i486 i386 i86
sun.desktop = windows
sun.io.unicode.encoding = UnicodeLittle
sun.java.command = sun.plugin2.main.client.PluginMain write_pipe_name=jpi2_pid7004_pipe37,read_pipe_name=jpi2_pid7004_pipe36
sun.java.launcher = SUN_STANDARD
sun.jnu.encoding = Cp1252
sun.management.compiler = HotSpot Client Compiler
sun.net.client.defaultConnectTimeout = 120000
sun.net.http.errorstream.enableBuffering = true
sun.os.patch.level = Service Pack 2
trustProxy = true
user.country = FR
user.dir = C:\dtaille\TMA\perfs_br\newcert
user.home = C:\Users\taille
user.language = fr
user.name = taille
user.script =
user.timezone = Europe/Paris
user.variant =
Vider les propriétés de déploiement...
active.deployment.proxy.bypass.local = false
active.deployment.proxy.same = false
active.deployment.proxy.type = 3
deployment.baseline.url = https://javadl-esd-secure.oracle.com/update/baseline.version
deployment.blacklist.url = https://javadl-esd-secure.oracle.com/update/blacklist
deployment.blacklisted.certs.url = https://javadl-esd-secure.oracle.com/update/blacklisted.certs
deployment.browser.path = C:\Program Files\Mozilla Firefox\firefox.exe
deployment.browser.vm.iexplorer = true
deployment.browser.vm.mozilla = true
deployment.cache.enabled = true
deployment.cache.jarcompression = 0
deployment.cache.max.size = 726
deployment.capture.mime.types = false
deployment.console.startup.mode = SHOW
deployment.control.panel.log = false
deployment.expiration.decision.10.21.2 = later
deployment.expiration.decision.suppression.10.21.2 = true
deployment.expiration.decision.timestamp.10.21.2 = 9/6/2013 15:29:3
deployment.insecure.jres = PROMPT
deployment.javafx.mode.enabled = true
deployment.javapi.cache.update = false
deployment.javapi.lifecycle.exception = false
deployment.javapi.log.filename =
deployment.javapi.runtime.type = 0
deployment.javapi.stop.timeout = 200
deployment.javapi.trace.filename =
deployment.javaws.appicon.index = C:\Users\taille\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\appIcon\appIcon.xml
deployment.javaws.associations = ASK_USER
deployment.javaws.cache.update = false
deployment.javaws.concurrentDownloads = 4
deployment.javaws.install = IF_HINT
deployment.javaws.installURL = http://java.sun.com/products/autodl/j2se
deployment.javaws.logFileName =
deployment.javaws.muffin.max = 256
deployment.javaws.shortcut = ASK_IF_HINTED
deployment.javaws.splash.index = C:\Users\taille\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\splash\splash.xml
deployment.javaws.traceFileName =
deployment.javaws.uninstall.shortcut = false
deployment.javaws.update.timeout = 1500
deployment.javaws.viewer.bounds = 1723,197,881,546
deployment.jpi.mode.new = true
deployment.log = false
deployment.macosx.check.update = true
deployment.max.output.file.size = 10
deployment.max.output.files = 5
deployment.mime.types.use.default = true
deployment.modified.timestamp = 1380804178316
deployment.proxy.bypass.local = false
deployment.proxy.override.hosts =
deployment.proxy.same = false
deployment.proxy.type = 3
deployment.security.SSLv2Hello = false
deployment.security.SSLv3 = true
deployment.security.TLSv1 = true
deployment.security.TLSv1.1 = false
deployment.security.TLSv1.2 = false
deployment.security.askgrantdialog.notinca = true
deployment.security.askgrantdialog.show = true
deployment.security.authenticator = true
deployment.security.blacklist.check = true
deployment.security.browser.keystore.use = true
deployment.security.clientauth.keystore.auto = true
deployment.security.disable = false
deployment.security.https.warning.show = false
deployment.security.jsse.hostmismatch.warning = true
deployment.security.level = HIGH
deployment.security.local.applets = PROMPT
deployment.security.mixcode = DISABLE
deployment.security.notinca.warning = true
deployment.security.password.cache = true
deployment.security.run.untrusted = PROMPT
deployment.security.sandbox.awtwarningwindow = true
deployment.security.sandbox.casigned = PROMPT
deployment.security.sandbox.jnlp.enhanced = true
deployment.security.sandbox.selfsigned = PROMPT
deployment.security.trusted.policy =
deployment.security.validation.crl = false
deployment.security.validation.ocsp = false
deployment.security.validation.ocsp.publisher = false
deployment.system.cachedir = C:\Users\taille\AppData\LocalLow\Sun\Java\Deployment\SystemCache
deployment.system.security.blacklist = C:\tools\Java\jre7\lib\security\blacklist
deployment.system.security.cacerts = C:\tools\Java\jre7\lib\security\cacerts
deployment.system.security.jssecacerts = C:\tools\Java\jre7\lib\security\jssecacerts
deployment.system.security.oldcacerts = C:\tools\Java\jre7\lib\security\cacerts
deployment.system.security.oldjssecacerts = C:\tools\Java\jre7\lib\security\jssecacerts
deployment.system.security.trusted.certs = C:\tools\Java\jre7\lib\security\trusted.certs
deployment.system.security.trusted.clientauthcerts = C:\tools\Java\jre7\lib\security\trusted.clientcerts
deployment.system.security.trusted.jssecerts = C:\tools\Java\jre7\lib\security\trusted.jssecerts
deployment.system.security.trusted.libraries = C:\tools\Java\jre7\lib\security\trusted.libraries
deployment.system.tray.icon = true
deployment.trace = true
deployment.update.mime.types = true
deployment.user.cachedir = C:\Users\taille\AppData\LocalLow\Sun\Java\Deployment\cache
deployment.user.extdir = C:\Users\taille\AppData\LocalLow\Sun\Java\Deployment\ext
deployment.user.logdir = C:\Users\taille\AppData\LocalLow\Sun\Java\Deployment\log
deployment.user.security.blacklist = C:\Users\taille\AppData\LocalLow\Sun\Java\Deployment\security\blacklist
deployment.user.security.blacklist.dynamic = C:\Users\taille\AppData\LocalLow\Sun\Java\Deployment\security\blacklist.dynamic
deployment.user.security.blacklisted.certs = C:\Users\taille\AppData\LocalLow\Sun\Java\Deployment\security\blacklisted.certs
deployment.user.security.policy = file:/C:/Users/taille/AppData/LocalLow/Sun/Java/Deployment/security/java.policy
deployment.user.security.sandbox.certs = C:\Users\taille\AppData\LocalLow\Sun\Java\Deployment\security\sandbox.certs
deployment.user.security.saved.credentials = C:\Users\taille\AppData\LocalLow\Sun\Java\Deployment\security\auth.dat
deployment.user.security.trusted.cacerts = C:\Users\taille\AppData\LocalLow\Sun\Java\Deployment\security\trusted.cacerts
deployment.user.security.trusted.certs = C:\Users\taille\AppData\LocalLow\Sun\Java\Deployment\security\trusted.certs
deployment.user.security.trusted.clientauthcerts = C:\Users\taille\AppData\LocalLow\Sun\Java\Deployment\security\trusted.clientcerts
deployment.user.security.trusted.jssecacerts = C:\Users\taille\AppData\LocalLow\Sun\Java\Deployment\security\trusted.jssecacerts
deployment.user.security.trusted.jssecerts = C:\Users\taille\AppData\LocalLow\Sun\Java\Deployment\security\trusted.jssecerts
deployment.user.security.trusted.libraries = C:\Users\taille\AppData\LocalLow\Sun\Java\Deployment\security\trusted.libraries
deployment.user.tmp = C:\Users\taille\AppData\LocalLow\Sun\Java\Deployment\tmp
deployment.version = 7.21
deployment.webjava.enabled = true
java.quick.starter = falseThis behavior was introduced by a security "fix" intended to prevent a DNS re-binding attack which permits unsigned applets to escape the applet sandbox. The "fix" was, imo, very poorly thought out. You think you have a problem with 1.5 megabits of applet jars, but I have 8 megabytes, hundreds of thousands of users, with lousy networks. So now I'm stuck with a colocation vendor. Imagine my chagrin when they changed *their* ISP and thus their IP addresses.
As far as I can see, signed applets are already permitted (if the user allows) to communicate outside the sandbox, so this "fix" should not have been applied to signed jars, only to unsigned ones. There are a couple of other techniques that Oracle might have used to prevent this attack, but they chose the simplest one, effectively preventing anyone from using the most common, inexpensive strategies for improving the availability of their web-based Java applications. -
White dot (not dead pixel) on external LCD monitor.
Hi all,
I recently noticed a strange situation. I've owned a MacBook Pro 13" since October, and usually run it with an external Samsung T260 LCD monitor by MiniDP to DVI. I run the monitor at its full resolution of 1920x1200.
When I arrange the monitors so that the Samsung is on top of my MBP, there is a white dot about the size of a pixel approximately 3 inches from the left and 1/2 inch from the bottom of the screen. I thought it was a dead pixel, but when I move the external monitor to be on the left of the MBP, the white dot moves to 3 inches from the top and 1/2 inch from the right.
* The white dot does not appear when I arrange the monitors in any other configuration.
* The white dot appears when using MiniDP to VGA adapter as well.
* When I zoom using the modifer key+scroll method, the white dot grows bigger.
I've tried using the JScreenFix applet, but as I said, it doesn't look like a dead pixel.
Can anyone offer any other suggestions, that may involved poking around in the Video RAM space?
Thanks,
-TonyHi all,
Just returning to provide more information:
While playing around with my screen layouts, I found that the white dot is actually part of the menu bar graphic. I arranged my monitors and captured the screen to show the placement of the dot.
http://picasaweb.google.com/tonychung.ca/SonicTheme#5423207200689428946
I hope Apple is able to fix this in the next SW update.
Cheers,
-Tony -
Servlet Applet object communication problem???!!!
Hy folks,
I need to validate the ability of complex Servlet Applet communication an run into my first pb right at the beginning of my tests. I need to have around 200 Applet clients connect to my servlet and communicate by ObjectInput and ObjectOutput streams. So I wrote a simple Servlet accepting HTTP POST connections that return a Java object. When the java Applet get instantiated, the Object Stream communication workes fine. But when the Applet tries to communicate with the servlet after that, I can not create another communication session with that Servlet, instead I get a 405 Method not allowed exception.
Summarized:
- Applet init() instantiate URLConnection with Servlet and request Java object (opening ObjectInput and Output Stream, after receaving object, cloasing streams).
- When I press a "get More" button on my Applet, I am not able to instantiate a new URLConnection with my servler because of that 405 exception, WHY???
Here my Servlet code:
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException{
ObjectInputStream inputFromApplet = null;
ArrayList transmitContent = null;
PrintWriter out = null;
BufferedReader inTest = null;
try{
inputFromApplet = new ObjectInputStream(request.getInputStream());
transmitContent = (ArrayList) inputFromApplet.readObject();
inputFromApplet.close();
ArrayList toReturn = new ArrayList();
toReturn.add("One");
toReturn.add("Two");
toReturn.add("Three");
sendAnsweredList(response, toReturn);
catch(Exception e){}
public void sendAnsweredList(HttpServletResponse response, ArrayList returnObject){
ObjectOutputStream outputToApplet;
try{
outputToApplet = new ObjectOutputStream(response.getOutputStream());
outputToApplet.writeObject(returnObject);
outputToApplet.flush();
outputToApplet.close();
catch (IOException e){
e.printStackTrace();
}Here my Applet code:
public void init() {
moreStuff.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
requestMore();
try{
studentDBservlet = new URL("http://localhost/DBHandlerServlet");
servletConnection = studentDBservlet.openConnection();
servletConnection.setUseCaches (false);
servletConnection.setDefaultUseCaches(false);
servletConnection.setDoOutput(true);
servletConnection.setDoInput(true);
ObjectOutputStream outputToApplet;
outputToApplet = new ObjectOutputStream(servletConnection.getOutputStream());
outputToApplet.writeObject(new ArrayList());
outputToApplet.flush();
outputToApplet.close();
ObjectInputStream inputFromServlet = new ObjectInputStream(servletConnection.getInputStream());
ArrayList studentVector = (ArrayList) inputFromServlet.readObject();
area.setText("Success!\n");
for (int i = 0; i<studentVector.size(); i++) {
area.append(studentVector.get(i).toString()+"\n");
inputFromServlet.close();
outputToApplet.close();
catch(Exception e){
area = new JTextArea();
area.setText("An error occured!!!\n");
area.append(e.getMessage());
getContentPane().add(new JScrollPane(area), BorderLayout.CENTER);
getContentPane().add(moreStuff, BorderLayout.SOUTH);
private void requestMore(){
try{
studentDBservlet = new URL("http://localhost/DBHandlerServlet");
servletConnection = studentDBservlet.openConnection();
ObjectInputStream inputFromServlet = new ObjectInputStream(servletConnection.getInputStream());
ArrayList studentVector = (ArrayList) inputFromServlet.readObject();
area.setText("Success2!\n");
for (int i = 0; i<studentVector.size(); i++) {
area.append(studentVector.get(i).toString()+"\n");
catch(Exception e){
area.setText("An error occured2!!!\n");
area.append(e.getMessage());
}Can someone help me solv this issue please, this is my first Applet Servlet work so far so I have no idea on how to solve this issue.Sorry folks, just found my error. Forgot about the ObjectInputStream waiting on the Servlet side, so of course had a dead look...
Sorry!
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