Problem of applet

I am trying to call javascript method in java(in my applet)
here i wrote the jsp page and i used
<jsp:plugin> tag for applet. This is working fine with IE6.0 and Netscape4.6. but with the latest version of Netscape(6.2) i am getting the following exception
netscape.javascript.JSException: JSObject.getWindow() requires mayscript attribute on this Applet at java.lang.reflect.Constructor.newInstance(Native Method) at sun.plugin.liveconnect.PrivilegedConstructObjectAction.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)     at sun.plugin.liveconnect.SecureInvocation.ConstructObject(Unknown Source)
I am adding my applet code and jsp code.
In my applet there is button, by clicking the button it will calls the javascript method and closes the browser window.
Applet class:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import netscape.javascript.JSObject;
import netscape.javascript.*;
import javax.swing.colorchooser.AbstractColorChooserPanel;
public class JSoTest extends JApplet implements ActionListener
JButton btn;
JPanel p1;
     Color clr;
public JSoTest()
init();
public void init()
btn=new JButton("Close");
          btn.addActionListener(this);
          clr=Color.green;
p1=new JPanel();
this.getContentPane().setLayout(new BorderLayout());
getContentPane().add(p1,"Center");
getContentPane().add(btn,"South");
          p1.setBackground(clr);
     public void actionPerformed(ActionEvent e)
try{
JSObject obj=JSObject.getWindow(this);
obj.call("close",null);
catch(Exception ex)
ex.printStackTrace();
jsp page:
<html>
<head>
</head>
<body >
<jsp:plugin type="applet" code="JSoTest.class" codebase="/examples/jsp/plugin/applet/"
     jreversion="1.3"
     iepluginurl="http://java.sun.com/products/plugin/1.3/plugin-install.html"
     nspluginurl="http://java.sun.com/products/plugin/1.3/plugin-install.html"
     width="200" height="150" name="Fractal">
<jsp:params>
     <jsp:param name="MAYSCRIPT" value="true" />
</jsp:params>
<jsp:fallback>
     <p>Unable to load java plugin</p>
</jsp:fallback>
</jsp:plugin>
</body>
</html>
If i write the html file instead of jsp file it is working fine.

Try to use the following code to display the applet in the jsp, this is an example that I used in my intranet:
<OBJECT classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"
WIDTH = 700 HEIGHT = <%=applet_height%>
codebase="http://java.sun.com/products/plugin/1.4.1/jinstall-111-win32.cab#Version=1,1,1,0" >
<PARAM NAME = CODE VALUE = "Assay_Comp_Applet.class" >
<PARAM NAME = CODEBASE VALUE = "applets/mosaic/" >
<PARAM NAME="type" VALUE="application/x-java-applet;version=1.1">
<PARAM NAME = "ProFile" VALUE ="applets/mosaic/data/TW_profiles.txt">
<PARAM NAME = "AssayFile" VALUE ="applets/mosaic/<%=CLresults_file%>">
<PARAM NAME = "Width" VALUE ="<%=applet_width%>">
<PARAM NAME = "Height" VALUE ="<%=applet_height%>">
<PARAM NAME = "#Compounds" VALUE ="<%=nbr_compounds%>" >
<PARAM NAME = "bgColor" VALUE ="0xF3F3F3" >
<PARAM NAME = "AssColor" VALUE ="0xBBEEBB">
<COMMENT>
<EMBED type="application/x-java-applet;version=1.1"
java_CODE = "Assay_Comp_Applet.class"
java_CODEBASE = "applets/mosaic/" WIDTH = 700 HEIGHT =700 ProFile = "applets/mosaic/data/TW_profiles.txt"
AssayFile = "applets/mosaic/test.txt"
Width = "<%=applet_width%>" Height = "<%=applet_height%>" #Compounds = "<%=nbr_compounds%>" bgColor = "0xF3F3F3" AssColor = "0xBBEEBB" pluginspage="http://java.sun.com/products/plugin/1.4.1/plugin-install.html"><NOEMBED></COMMENT>
>
</NOEMBED></EMBED>
</OBJECT>


Actually first I made a html page with the applet-code and after that I used HTML Converter to place in the code like you see above.
Greetings
Koen

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jschell wrote:
rritoch wrote:
I am developing an applet (extends Applet but uses swing components) using JDK 1.6 (Though these problems still happen in JDK 1.7) and I am unable to get the applet to load on a 64 bit machine in most cases.
To clarify...
1. You have tried it on 32 bit machine? Exactly which OS?I tested this on Windows Vista Business which is in 32 bit mode and the applets run without any problems
>
2. Your only 64 bit tests have involved 2008/Win7?
If so then I would suspect something with windows not java. Probably permissions.
The web server(s) are running on localhost and I am connecting on the same machine using a local network ip address (such as 192.168.*.*)
Yes, I haven't tried running the jars on other operating systems.
>
I don't understand that. If you are running on localhost then you should connect to localhost. If running on an IP then you should connect to that. Perhaps you meant that you have tested using both of those?I'm testing using the lan ip address but I'm connecting from the same machine. I've tried localhost and that didn't work so I tried lan ip since that will likely have a different java security context than localhost. At first I was blaming the IIS server but I downloaded the jar directly and using HTTP fox was able to verify that the jar is being sent with the correct mime-type and that the server can upload the jar file without a problem. This leaves me to believe the problem is with Java.

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which is available in Java Application, it will show the exception in DOS(shown in the end).This project is urgent to me, can U tell me whether it has or what is the solution for it? thank you very much.
Exception occurred during event dispatching:
java.security.AccessControlException: access denied (java.awt.AWTPermission acce
ssClipboard)
at java.security.AccessControlContext.checkPermission(AccessControlConte
xt.java:272)
at java.security.AccessController.checkPermission(AccessController.java:
399)
at java.lang.SecurityManager.checkPermission(SecurityManager.java:545)
at java.lang.SecurityManager.checkSystemClipboardAccess(SecurityManager.
java:1375)
at sun.awt.windows.WToolkit.getSystemClipboard(WToolkit.java:573)
at javax.swing.text.JTextComponent.cut(JTextComponent.java:1249)
at UI24AT.actionPerformed(UI24AT.java:3374)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:14
50)
at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(Abstra
ctButton.java:1504)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel
.java:378)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:250
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonL
istener.java:216)
at java.awt.Component.processMouseEvent(Component.java:3717)
at java.awt.Component.processEvent(Component.java:3546)
at java.awt.Container.processEvent(Container.java:1167)
at java.awt.Component.dispatchEventImpl(Component.java:2595)
at java.awt.Container.dispatchEventImpl(Container.java:1216)
at java.awt.Component.dispatchEvent(Component.java:2499)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:2458
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:2223)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:2132)
at java.awt.Container.dispatchEventImpl(Container.java:1203)
at java.awt.Window.dispatchEventImpl(Window.java:918)
at java.awt.Component.dispatchEvent(Component.java:2499)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:336)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchTh
read.java:134)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre
ad.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:96)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:88)

When you are running in an applet, access to the windows clipboard is restricted (otherwise an applet could take the contents of the clipboard and send them back to it's server over the internet, potentially leaking important business information from your pc).
Why do you need to copy the text? If you want to just place the text into some other area of your GUI then I suggest you use TextArea.GetText()

Chess Piece display problem in applet

Hi,
I'm writing a chess game applet which will be played between to players over the internet. I'm currently working on the applet side at the moment and will develop the server side once I have completed the applet. I'm currently having problems displaying the actual chess pieces on the board at the moment. One of my design decisions was to make a Board class which extends a JPanel. I have painted the actual chess board squares within the Board JPanel. I then propose to draw the pieces on top of these squares (good design decsion? Can anyone suggest another way. I was thinking of having the images as a separate layer which will sit on top of the squares but wasn't sure how to implement it). The chess pieces are contained in a gif strip www.dur.ac.uk/j.d.p.murphy called ChessPieces02.gif . The problem I am having is to display several pieces at the same time. I lloked at a Java tutorial which suggested using g.clipRect() method to display a defined section of the strip (i.e. a single piece of a certain length). Below is the Board class that I am using.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Board extends JPanel{
// Holds location of the mousePressed event
Point point = null;
// Size of a square square on the board
int square_size = 40;
// Mediatracker to monitor the loading of the images
MediaTracker tracker;
Image image;
void init() {
tracker = new MediaTracker(this);
image = Toolkit.getDefaultToolkit().getImage("ChessPieces02.gif");
tracker.addImage(image, 0);
try {
//Start downloading the images. Wait until they're loaded.
tracker.waitForAll();
} catch (InterruptedException e) {
e.printStackTrace();
throw new Error("error");
if (tracker.isErrorAny()) {
throw new Error("Could not load image");
addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent e) {
if (point == null)
point = new Point(0, 0);
int x = e.getX();
int y = e.getY();
System.out.println("X co-ord: " + x + " Y co-ord: " + y);
// Floor the x and y values to the nearest unit of 25
x = x - x % square_size;
y = y - y % square_size;
point.setLocation(x, y);
repaint();
System.out.println(point);
public void paintComponent(Graphics g) {
super.paintComponent(g); //paint background
System.out.println("Chess Board Paint");
// Loop to produce the black and white squares to represent the board
for(int jj = 0; jj < 8; jj ++){
for(int ii = 0; ii < 8; ii++){
if(ii % 2 == jj % 2)
g.setColor(Color.white);
else
g.setColor(Color.lightGray);
g.fillRect(ii * square_size, jj * square_size, square_size, square_size );
// Draw a highlighted square
if (point != null){
g.setColor(Color.green);
g.fillRect( (int)point.getX(), (int)point.getY(), square_size, square_size);
//imageStrip is the Image object representing the image strip.
//imageWidth is the size of an individual image in the strip.
//imageNumber is the number (from 0 to numImages)
// of the image to paint.
int stripWidth = image.getWidth(this);
int stripHeight = image.getHeight(this);
int imageWidth = stripWidth / 6;
System.out.println("Width = " + imageWidth);
g.clipRect(120, 0, imageWidth, stripHeight / 2);
g.drawImage(image, 0 * imageWidth, 0, this);
What code do i need to add more pieces to the board? I plan to make a ChessPiece array (8x8) which will holld all the chess pieces on the board. Should I hold this array in the board class to make drawing the pieces easier? Any other tips for game development would also be most welcome.
Thanks

cross post, I think.
http://forum.java.sun.com/thread.jsp?thread=496287&forum=406

Japanese text display problems in applet using plugin

Hi,
We've been beating our heads against the wall on this one for quite some time, so any help would be greatly appreciated.
Our product uses a third party applet (Kavachart from Visual Engineering) to display graphical statistics from our database. We are currently localizing our product to support english and japanese. With Japanese enabled, all pages use euc-jp encoding. The problem we are running into is in the display of japanese text inside this applet in IE 5 and NS 4.7x when using the java plugin (1.3 or 1.4). If the default jre of the browsers are used, the text in the applet renders fine.
On a suggestion from the supprot folks at Visual Engineering, I modified our code to set the defaultFont parameter on the applet to "serif, 14, 1". With this set, the text in the applet renders ok in IE, but NS on windows and unix is still broken. Given that we are doing all these tests on machines running a native japanese OS, it's not even clear to me why setting the defaultFont should even be required, but at this point, I'll take anything :-)
Has anyone else run into this and either solved it or proven that a solution is not feasible? I'm at my wits end here....
Thanks in advance,
Mark Evangelisto
Synchronicity Inc.

If you are using different java plugin, you need to install the international version of the JRE; otherwise, some characters may not be able to display correctly since some of the properties files are missing.
As for Visual Engineering's suggestion. I don't know why they tell you to set the default font on the applet because it may cause the browser to use the font specified. Your applet works on IE because it will try to use the best font to match the web page's content. For NS anything less then 6.0 (technology based on Mozilla), they never display web page correctly especially if you did what VE suggest.
If you are running the applet on the native langauge OS with the international version of the JRE installed, the applet should display correctly without setting the default font. If it is not the native langauge OS, first you need to install the international version of the JRE and have the fonts that are able to display the language the applet use.

Problem restoring applet focus

As an exercise I wrote a Tetris clone in Swing. The game itself is fine, and runs without problems when run standalone in a JFrame. Next, I tried making an applet version of the game. Mostly the same code, just wrapped inside of a JApplet instead of a JFrame. Here's where the problems started.
The applet version seems to run fine in Firefox as long as you do not open a new tab, or click on another already-opened tab. If you go to another tab, then back to the applet's tab, and try clicking on the applet, focus is never regained (or so it seems - the applet no longer responds to keypresses).
In other words:
1. I load the applet in a new tab in Firefox. I can click on the game and play it like I'd expect.
2. I click on some other tab I already have open.
3. I click back on the Tetris applet's tab.
4. I click on the applet and try to start playing again. The applet doesn't respond to any keypresses, no matter how hard I try.
What am I missing here? Hopefully this sounds familiar to somebody. I would post some code but the game is made up of several source files, and I was hoping someone would spot the obvious for me just from a description.
FWIW, using IE7 and Safari, things work as expected - I can switch tabs, then come back and play the game fine. (Although with Safari, sometimes I really have to work to get the applet focus in the first place, but I think that's a different issue).
Thanks for any help!

thorsti16 wrote:
Hi,
i have a similar focus problem. After a click of a Tab and back the focus for keyboard is gone.
I use a shell which has embedded th IE control. My applet has no such problems with jre 1.4.2_10 and older vms.
Which jre version do you use?On Windows it was 1.6.0_03. On OS X, 1.5.0_07. On Fedora Linux, I'm not sure, but it was some release of 1.6. With all three configurations, Firefox had this problem.
Could you please check your applet with 1.4.2_10 ? Perhaps we are facing the same problem.
thorstenUnfortunately my code uses Java 5 features, so I can't test with 1.4.x. I might "backport" to 1.4 just to see if things work that way. But I think I found a solution. Try something like this in your applet's init() method:
applet.setFocusable(false);
gamePanel.setFocusable(true);
gamePanel.setFocusCycleRoot(true);where above, "gamePanel" is the JPanel (or whatever) you added to the applet's content pane, that renders the game, etc. With this code, the "switching tabs" problem is fixed for me on both Windows and OS X. I haven't tested on Fedora yet; when I do I'll post back with the results.
So try the above if you can, and post back with whether it works for you! I suppose if gamePanel is not a java.awt.Container subclass (i.e. if you use java.awt.Canvas), you won't have a setFocusCycleRoot() method to call, but you might not need it in that case. Not sure, haven't tested that either...

Java 7: Problems launching applets with jars on "file://" location

Hi,
We are experiencing a problem when updating our client's JRE from Java6 U 21 up to Java7 U 55.
We have developed an Applet which is composed by several JAR files. Some of those JARs must be stored in local drive, and the JAR with the main Java class is stored on server.
Let's supose we have a similar scenario like this:
https://blahblahbah/bar.jar
https://blahblahbah/test.html
C:/foo.jar
The code of test.html:
<embed
archive="file:///C:/foo.jar"
cache_archive="bar.jar"
/>
This code works fine on Java 6 and Applet is correctly loaded.
However, with Java 7 a security exception is raised when trying to load JAR files from "file:///" location during Applet launch:
java.lang.SecurityException: Permission denied: file:/C:/foo.jar
    at sun.plugin2.applet.Applet2Manager._loadJarFiles(Unknown Source)
We have tried several tests using a java.policy file which grants all possible permisions:
grant codeBase "file:/C:/foo.jar" {
    permission java.security.AllPermission;
grant {
permission java.security.AllPermission;
We also tried to low Java's security level to "MEDIUM", with no success.
We finally only managed to run the Applet if we explicity disable the "Next-Generation Plugin" with Internet Explorer 8. However, that's not a suitable solution, and still does not work with Mozilla family browsers.
Eventhought with Mozilla browsers is still not working.
Is there any restrictions in Java 7 that prevents to read jars from being loaded from local drive when launching Applets?
Thanks in advance,

Thank you baftos.
I had read the whole message before posting mine. It's not the same problem. I'm able to run the sample signed applet always having the jar in the same location than the HTML page serving the applet via JNLP:
<jar href="SignedAppletTest.jar" main="true"/>
However, the security exception raises when trying to read that jar from local drive:
<jar href="file://C:/SignedAppletTest.jar" main="true"/>
ExitException[ 3]java.lang.SecurityException: Permission denied: file://C:/SignedAppletTest.jar
    at sun.plugin2.applet.JNLP2Manager.loadJarFiles(Unknown Source)
I have even tried to decompile JNLP2Manager class, without seeing anything useful on that loadJarFiles method
The only way I managed to avoid the problem is unchecking the New Generation Plugin and running the Applet with IE. Not a suitable solution for me at all..

Problem of applet

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