Question about Java SDK 1.5.0 and mobile devices...
Hello, everyone. This is my first time posting on these forums since I usually find the answers I need from old threads (this place is VERY informative and HELPFUL). I wanted to know if it's possible at all to create a program from the Java Standard Edition Development Kit and have it operate on a mobile device or a suitable mobile device emulator? Or is that ony feasible with the J2ME kit? Any revelant response would be much appreciated. Thanks!
A J2SE application will not work on most mobile
devices.I know J2SE applications that don't even work on non-mobile devices.
Similar Messages
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Question about the relationship between a project and Mobile Me album
Hello esteemed members of the Aperture community
I have a puzzling issue. I have published a project on MobileMe. My project is arranged somewhat chronologically, and I want MobileMe to follow this. However, the MobileMe album in Aperture does not synchronize with the project, and subsequently, the gallery on MobileMe does neither. How do I tell the MobileMe album in Aperture to synchronize itself with my project, and update changes as I edit the project, or am I just totally confused...always a possibility?
Thanks in advanceYou sort of answered your own question in the title: Your Mobile Me gallery is an album. By design, changing the sort order of a project does not affect the sort order of related albums and vice versa. You'll have to make those changes in the album to have them reflected in the gallery.
I know of no way to have an album synchronize with a project. (Note: if you make adjustments to images or delete images from a project, those changes will be reflected in the album, but the sort order will not.)
DLS -
Three questions about Java and Ftp
Hello, i've the following questions about Java and Ftp:
1- .netrc file is in $HOME directory but i can't access to this directory from java code. The following line producesan Exception (directory doesn't exists)
FileWriter file = new FileWriter ("$HOME/.netrc");
2- .netrc file must have the following permissions: -rw- --- --- but when i create the .netrc file the following permissions are on default: -rw- r-- r--, how can i change this permissions? (In java code, i can't use chmod.....)
3- Are there any way to pass parameters to a .netrc file? If i get to do this i needn't change the permissions because i can't modify or create/destroy this file.
Thanks in advanced!!!
Kike1- .netrc file is in $HOME directory but i can't
access to this directory from java code. The
following line producesan Exception (directory
doesn't exists)
FileWriter file = new FileWriter ("$HOME/.netrc");$HOME would have to be replaced by a shell, I don't
think you can use it as part of a legal path.
Instead, use System.getProperty("user.home");
Ok, thanks
2- .netrc file must have the followingpermissions:
-rw- --- --- but when i create the .netrc file the
following permissions are on default: -rw- r--r--,
how can i change this permissions? (In java code,i
can't use chmod.....)Yes, you can: Runtime.exec("chmod ...");
I need to use estrictly the .netrc with -rw- --- --- permissions
Yes, i can use Runtime.exec ("chmod ..."); but i don't like very much this solution because is a slow solution, am i right?
3- Are there any way to pass parameters to a.netrc
file? If i get to do this i needn't change the
permissions because i can't modify orcreate/destroy
this file.I don't think so. Why do you need the .netrc file in
Java at all? Writing a GUI frontend?I want to use automatic ftp in a java program and FTP server, the files and path are not always the same, so i can:
- modify .netrc (for me is the complex option)
- destroy and create a new .netrc (is easier but i have permissions problem)
- use .netrc with parameters but i haven't found any help about it
Thanks for your prompt reply!!!!
Kike -
Question about Java's HttpServer: Threading? Backlog?
Hello,
I have two questions about Java's HttpServer (com.sun.net.httpserver). From the JavaDoc:
>
Management of threads can be done external to this object by providing a Executor object. If none is provided a default implementation is used.
>
How can I get information about the default implementation in 1.6.0_13? Do you know the behavior? From my observations, the default implementation uses no Threads, meaning every request is handled in the same Thread, this results in handling the requests to the HttpServer one after another.
Is this right?
The second question is about this, also from the JavaDoc:
>
When binding to an address and port number, the application can also specify an integer backlog parameter. This represents the maximum number of incoming TCP connections which the system will queue internally. [...]
>
When setting the backlog to -1, it uses the systems default backlog. How can I determine the systems default backlog? Can some lines of Java code reveal it (there is no getBeacklog() method)? Or is it up to the Operating System (we use Redhat Linux)?
Thanks a lot for your help!
Regards,
TimoHow can I determine the systems default backlog?You can't. There is no API for that even at the C level.
Can some lines of Java code reveal itNo.
Or is it up to the Operating System (we use Redhat Linux)?Yes. Linux provides a large default. It seems to be at least 50 on most platforms. This is not something you should be worrying about. -
I forgot the security question about what was my first car and what is my favorite car! What is the solution to change that? please help me, thank you in advance Leo
If you have a rescue email address set up on your account then you can try going to https://appleid.apple.com/ and click 'Manage your Apple ID' on the right-hand side of that page and log into your account. Then click on 'Password and Security' on the left-hand side of that page and on the right-hand side you might see an option to send security question reset info to your rescue email address.
If you don't have a rescue email address set up then go to Express Lane and select 'iTunes' from the list of 'products' in the middle of the screen.
Then select 'iTunes Store', and on the next screen select 'Account Management'
Next choose 'iTunes Store Account Questions' or 'iTunes Store account security' (it appears to vary by country) and fill in that you'd like your security questions/answers reset.
You should get an email reply within about 24 hours (and check your Spam folder as well as your Inbox) -
Question about bluetooth communication between PC and mobile device
I am a newbie of bluetooth communication. This time I need to have connumication between PC and mobile device (mainly mobile phone) by sending strings. PC is acted as server and mobile device act as client.
For using bluetooth in PC, I use bluecove 2.0.1
I have already connected them successfully.
When I want to send strings between them, it is found that it can only do one cycle of communication (client -> server -> client).
For my design, they can communicate multiple times.
I simulate the core class of the system, the performance is fine.
Cound anyone help me to watch the code and give me some advices?
Server Side - ServerBox.java
public class ServerBox implements Runnable {
LocalDevice localDevice;
StreamConnectionNotifier notifier;
ServiceRecord record;
boolean isClosed;
ClientProcessor processor;
CMDProcessor cmd;
MainInterface midlet;
private static final UUID ECHO_SERVER_UUID = new UUID(
"F0E0D0C0B0A000908070605040302010", false);
public ServerBox(MainInterface midlet) {
this.midlet = midlet;
public void run() {
boolean isBTReady = false;
try {
localDevice = LocalDevice.getLocalDevice();
if (!localDevice.setDiscoverable(DiscoveryAgent.GIAC)) {
midlet.showInfo("Cannot set to discoverable");
return;
// prepare a URL to create a notifier
StringBuffer url = new StringBuffer("btspp://");
url.append("localhost").append(':');
url.append(ECHO_SERVER_UUID.toString());
url.append(";name=Echo Server");
url.append(";authorize=false");
// create notifier now
notifier = (StreamConnectionNotifier) Connector.open(url.toString());
record = localDevice.getRecord(notifier);
isBTReady = true;
} catch (Exception e) {
e.printStackTrace();
// nothing to do if no bluetooth available
if (isBTReady) {
midlet.showInfo("Initalization complete. Waiting for connection");
midlet.completeInitalization();
} else {
midlet.showInfo("Initalization fail. Exit.");
return;
// produce client processor
processor = new ClientProcessor();
cmd = new CMDProcessor();
// start accepting connections then
while (!isClosed) {
StreamConnection conn = null;
try {
conn = notifier.acceptAndOpen();
} catch (IOException e) {
// wrong client or interrupted - continue anyway
continue;
processor.addConnection(conn);
// activate the set up of process
public void publish() {
isClosed = false;
new Thread(this).start();
// stop the service
public void cancelService() {
isClosed = true;
midlet.showInfo("Service Terminate.");
midlet.completeTermination();
// inner private class for handling connection and activate connection handling
private class ClientProcessor implements Runnable {
private Thread processorThread;
private Vector queue = new Vector();
private boolean isOk = true;
ClientProcessor() {
processorThread = new Thread(this);
processorThread.start();
public void run() {
while (!isClosed) {
synchronized (this) {
if (queue.size() == 0) {
try {
// wait for new client
wait();
} catch (InterruptedException e) { }
StreamConnection conn;
synchronized (this) {
if (isClosed) {
return;
conn = (StreamConnection) queue.firstElement();
queue.removeElementAt(0);
processConnection(conn);
// add stream connection and notify the thread
void addConnection(StreamConnection conn) {
synchronized (this) {
queue.addElement(conn);
midlet.showInfo("A connection is added.");
notify(); // for wait() command in run()
// receive string
private String readInputString(StreamConnection conn) {
String inputString = null;
try {
DataInputStream dis = conn.openDataInputStream();
inputString = dis.readUTF();
dis.close();
} catch (Exception e) {
e.printStackTrace();
return inputString;
private void sendOutputData(String outputData, StreamConnection conn) {
try {
DataOutputStream dos = conn.openDataOutputStream();
dos.writeUTF(outputData);
dos.close();
} catch (IOException e) {
// process connecion
private void processConnection(StreamConnection conn) {
String inputString = readInputString(conn);
String outputString = cmd.reactionToCMD(inputString);
sendOutputData(outputString, conn);
/* try {
conn.close();
} catch (IOException e) {}*/
midlet.showInfo("Client input: " + inputString + ", successfully received.");
}For "CMDProcessor" , it is the class of message processing before feedback to client.
Client side - ClientBox.java
public class ClientBox implements Runnable, CommandListener{
StringItem result = new StringItem("","");
private DiscoveryAgent discoveryAgent;
private String connString;
private boolean isClosed = false;
private boolean boxReady = false;
StreamConnection conn;
private static final UUID ECHO_SERVER_UUID = new UUID( "F0E0D0C0B0A000908070605040302010", false);
Form process = new Form("Process");
ClientInterface midlet;
public ClientBox(ClientInterface mid){
this.midlet = mid;
process.append(result);
process.addCommand(new Command("Cancel",Command.CANCEL,1));
process.setCommandListener(this);
new Thread(this).start();
public void commandAction(Command arg0, Displayable arg1) {
if(arg0.getCommandType()==Command.CANCEL){
isClosed = true;
midlet.notifyDestroyed();
public synchronized void run() {
LocalDevice localDevice = null;
boolean isBTReady = false;
/* Process Gauge screen */
midlet.displayPage(process);
Gauge g=new Gauge(null,false,Gauge.INDEFINITE,Gauge.CONTINUOUS_RUNNING);
process.append(g);
showInfo("Initalization...");
System.gc();
try {
localDevice = LocalDevice.getLocalDevice();
discoveryAgent = localDevice.getDiscoveryAgent();
isBTReady = true;
} catch (Exception e) {
e.printStackTrace();
if (!isBTReady) {
showInfo("Bluetooth is not avaliable. Please check the device.");
return;
if(!isClosed){
try {
connString = discoveryAgent.selectService(ECHO_SERVER_UUID, ServiceRecord.NOAUTHENTICATE_NOENCRYPT, false);
} catch (BluetoothStateException ex) {
ex.printStackTrace();
else return;
if (connString == null) {
showInfo("Cannot Find Server. Please check the device.");
return;
else showInfo("Can Find Server, stand by for request.");
boxReady = true;
/* True if the clientbox is ready */
public boolean getBoxReady(){
return boxReady;
/* True if the clientbox is closed in run() */
public boolean getIsClosed(){
return isClosed;
public String accessService(String input) {
String output = null;
try {
/* Connect to server */
StreamConnection conn = (StreamConnection) Connector.open(connString);
/* send string */
DataOutputStream dos = conn.openDataOutputStream();
dos.writeUTF(input);
dos.close();
/* receive string */
DataInputStream dis = conn.openDataInputStream();
output = dis.readUTF();
dis.close();
} catch (IOException ex){
showInfo("Fail connect to connect to server.");
return output;
private void showInfo(String s){
StringBuffer sb=new StringBuffer(result.getText());
if(sb.length()>0){ sb.append("\n"); }
sb.append(s);
result.setText(sb.toString());
}Client side - ClientInterface.java
public class ClientInterface extends MIDlet implements Runnable, CommandListener{
private ClientBox cb = new ClientBox(this);
private Form temp = new Form("Temp");
private Command select = new Command("Select", Command.OK, 1);
private Command back = new Command("Back", Command.BACK, 1);
Alert alert;
String[] element;
String out;
List list;
public void run(){
/* Send message and get reply */
out = cb.accessService("Proglist");
element = split(out,",");
/* Use the reply to make list */
list = createList(element[0], List.IMPLICIT, out);
list.addCommand(select);
list.addCommand(back);
list.setCommandListener(this);
Display.getDisplay(this).setCurrent(list);
public void startApp() {
System.gc();
waitForBoxSetUp(); /* Recursively check for clientbox status */
new Thread(this).start();
public void pauseApp() {
public void destroyApp(boolean unconditional) {
notifyDestroyed();
public void displayPage(Displayable d){
Display.getDisplay(this).setCurrent(d);
private void waitForBoxSetUp(){
while(!cb.getBoxReady()){
if(cb.getIsClosed())
notifyDestroyed();
public void commandAction(Command c, Displayable d){
if (c.getCommandType() == Command.OK){
if (d == list){
/* Send the choice to server */
out = cb.accessService(list.getString(list.getSelectedIndex()));
alert = new Alert("Output", "selected = "+out, null, AlertType.ALARM);
alert.setTimeout(2000);
Display.getDisplay(this).setCurrent(alert,list);
if (c.getCommandType() == Command.BACK){
notifyDestroyed();
public void showWarning(String title, String content){
alert = new Alert("Output", "selected = "+list.getString(list.getSelectedIndex()), null, AlertType.ALARM);
alert.setTimeout(3000);
Display.getDisplay(this).setCurrent(alert,list);
private List createList(String name, int type, String message){
List temp;
String[] source = split(message,",") ;
temp = new List(name, type, source, null);
return temp;
private static String[] split(String original,String regex)
int startIndex = 0;
Vector v = new Vector();
String[] str = null;
int index = 0;
startIndex = original.indexOf(regex);
while(startIndex < original.length() && startIndex != -1)
String temp = original.substring(index,startIndex);
v.addElement(temp);
index = startIndex + regex.length();
startIndex = original.indexOf(regex,startIndex + regex.length());
v.addElement(original.substring(index + 1 - regex.length()));
str = new String[v.size()];
for(int i=0;i<v.size();i++)
str[i] = (String)v.elementAt(i);
return str;
}i haven't worked with devices but only with the toolkit emulators;
it definitely is possible...
u have to send the image as a bytestream and receive the image at the jsp end...
and then reconstruct the image.
the Stream classes in J2ME AND J2SE are all u will require.
also the Image class.
i have not done this but i have successfully sent an image frm a jsp and displayed it on the emulator. -
WebtoGo for laptop and mobile device - urgent
Hi,
I need to develop a web to Go application for both laptop and mobile device. The code which i generate for laptop should work on mobile device too.
ie the single application should work for both mobile and laptop devices.
Now coming to lightweight framework and small footprints what technologies should i use in J2EE.
If i use struts is that going to be mess in mobile device. Some one guide me here about choosing the technologies.
Thanksour java app that we have just ported from PDA to laptop uses AWT components as these work on the PDA. need to go for what will work on the windows mobile device, abnd this may restrict you to older and less functional components.
NOTE platform is defined within the application on the server side (the name of the database on the client), and therefore you will need two applications in terms of oracle lite publications, so define the database name external to the code in some kind of a properties/config file -
Has anyone else had problems since downloading latest update? My iTunes stopped working and mobile device won't download, I now don't have Apple to backup my iphone?
As i've posted in this thread:
http://discussions.apple.com/thread.jspa?threadID=746408&tstart=30
I've tried everything others have suggested without any luck.
Now I'm stuck with a 300 bucks mp3 jalopy.
My big question here is :
why aren't we hearing from apple? why aren't they saying something like "yeah we messed things up but be patient. we are trying our best to fix it..." ?
I was thinking to buy the macbook pro but now I'm afraid of the day things will get messy with that too.
Pentium 4 Windows XP -
IPhone composition The payload of and mobile device management is not installable in a utility.
Hello.
You.
And thank you.
I want you to help me if you please.
I am not good at English.
The status code of 201,204 which Apache returns from a MDM server.
iPhone composition The payload of and mobile device management is not installable in a utility.
iPhone composition Console of a utility.
May 1 09:46:15 unknown mc_mobile_tunnel[13281] <Notice>: (Note) MC: mc_mobile_tunnel shutting down.
May 1 09:46:18 unknown. profiled [13274] <Notice>: (Note) MC: Checking. for. MDM installation ... May 1 09:46:18 unknown profiled[13274] <Notice>: (Note) MC: ...finished checking for MDM installation.
May 1 09:46:18 unknown. profiled [13274] <Notice>: (Note) MC: Beginning. profile. installation ... May 1 09:46:20 unknown profiled[13274] <Notice>: (Error) MDM: Cannot Authenticate. Error: NSError:Desc : Since a transaction with the server in "https://www.anetm.com/dav/chkin" was in the situation of "204", it failed.
US Desc: A transaction with the server at"https://www.anetm.com/dav/chkin"has failed with the status"204."
Domain : MCHTTPTransactionErrorDomain
Code : 23001
Type : MCFatalError
Params : (
"https://www.anetm.com/dav/chkin",
204
May 1 09:46:20 unknown profiled [13274] <Notice>: (Error) MC: Cannot install MDM "mobile device management" .Error: NSError:
Desc : A payload "mobile device management" was not able to be installed.
Sugg : Since a transaction with the server in "https://www.anetm.com/dav/chkin" was in the situation of "204", it failed.
US Desc: The payload "mobile device management" could not be installed.
US Sugg: A transaction with the server at"https://www.anetm.com/dav/chkin"has failed with the status"204."
Domain : MCInstallationErrorDomain
Code : 4001
Type : MCFatalError
Params : (
"\U30e2\U30d0\U30a4\U30eb\U30c7\U30d0\U30a4\U30b9\U7ba1\U7406"
...Underlying error:
NSError:
Desc : Since a transaction with the server in "https://www.anetm.com/dav/chkin" was in the situation of "204", it failed.
US Desc: A transaction with the server at"https://www.anetm.com/dav/chkin"has failed with the status"204."
Domain : MCHTTPTransactionErrorDomain
Code : 23001
Type : MCFatalError
Params : (
"https://www.anetm.com/dav/chkin",
204
I would like to solve this problem.
If you please, please help me.Hello Jack,
Thank you for providing the details about the Apple Mobile Device USB Driver is not being listed. I found an article with some additional steps you can take.
I recommend following the steps in the section titled "If the Apple Mobile Device USB Driver is not listed" in step 5 of the following article:
iOS: Device not recognized in iTunes for Windows
http://support.apple.com/kb/TS1538
Thank you for using Apple Support Communities.
Best,
Sheila M. -
Okay so I'm trying to download Adobe Flash Pro. I've gone to creative cloud and downloaded "Flash Professional CC and Mobile Device Packaging (2014)" and I have no idea what to do afterwards... There's no way to open or run the file. And to be honest, I'm not even sure if it's the right download... Help!
I'm using PC with Windows 8.1. I got onto the Creative Cloud and downloaded "Flash Professional CC and Mobile Device Packaging (2014)". <--- That would be the file. I can't open or run it from CC and I couldn't find a file in my computer either.
I've also found direct downloads for the trial version and hit the set-up button, it loads up, and then nothing happens. -
Javascript created in fireworks doesn't work with touch ipad and mobile devices.
My website was created in DreamWeaver.
Navigation is a popup/dropdown menu run by javascript created in FireWorks
Website: www.woodstockchamber.com
Problem:
The mouse over doesn't work on iPads and mobile devices.
The menu opens up and the category highlights, but that is where the action stops.
It doesn't complete the action and link.
It has worked well for years on desk tops and laptops.
This is a serious issue for me as iPads and mobile devices are so popular and used a lot in this tourist town.
Thanks,
Normhttp://www.smashingmagazine.com/2010/05/28/web-development-for-the-iphone-and-ipad-getting -started/
http://www.inspiredm.com/2010/02/09/ipad-design/
http://blogs.sitepoint.com/2010/06/23/develop-for-ipad-with-html5-trial-and-error/ -
Update Flash Professional CC and Mobile Device Packaging
The adobe crative cloud app says that I have an upgrade for Flash Professional CC and Mobile Device Packaging. It has been failing for as long as I can remember. How do you download and install the update?
R/JensHere are the individual Flash updates: http://www.adobe.com/support/flash/downloads.html
-
Questions about Java Servlets and JSP
Hi,
I'm a confident Java Programmer (and really enjoy using this language) but am very new to Java servlets and Java Server Pages.
I have previously worked with Perl on my web projects (simple 'league' style voting pages). I read in my 'Core Java' book that I should no longer use perl or even cgi.
I need to know more about Java servlets and Java Server Pages so I can make the switch to a 'real' programming language.
I have a few questions:
How should I start to learn JS and JSP?
How applicable will the java knowlegdge I have already be?
Are JSP common on the world wide web?
What tools do I need to start? (I currently develop in JBuilder and have Java 1.4.1 Standard Edition)
Is it likey my web host (and others) will support JSP?
Thank-you very much for helping a novice get started,
Regards,
PaulHi, Steve ...has to be frustrating! But do not despair.
Let's suppose the servlet it's named MyServlet on package org.servlets
WEB-INF should look:
WEB-INF
classes
org
servlets
MyServlet.class
web.xml
web.xml file should have this two declarations:
<web-app>
<servlet>
<servlet-name>MyServlet</servlet-name>
<servlet-class>org.servlets.MyServlet</servlet-class>
</servlet>
<!-- other servlets -->
<servlet-mapping>
<servlet-name>MyServlet</servlet-name>
<url-pattern>/MyServlet</url-pattern>
</servlet-mapping>
<!-- other servlets mappings -->
</web-app>Now, once the container starts (Tomcat?), you should be able to see that servlet in:
http://localhost:8080/[my-context/]MyServletAnd what my-context is? The web application context. This string should be empty if your're deploying to the root context, otherwise should the context name. In Tomcat, deploying to root context defaults to using webapps/ROOT.
Sorry for my English, but I felt the need to answer your request. I hope it helps despite my writing. -
Some questions about Java deployment steps and techniques
All my java experience is coding and testing in my local machine (where, of course, a jre is available), but ... when I deploy to other people, they may not have a jre or they may have a different version of it than the one needed to run my application. I've read different stuff online including jars and java web start but still I have many questions.
(1) first one first, Sun contradicts common sense, when it says that i can redistribute my own customized light version of their jre by taking out some files (java.sun.com/j2se/1.5.0/jre/README). there are two ways for me to get a jre: Way one is by downloading one from Sun, the download comes as an *.exe file and I don't see how I can take files out of it, so do you know how?. Way two would be by simply copying the set of files i choose (according to that Readme) from my current jre installation (the one on my \java\jdk\jre directory), does this make sense?, (if you're under windows) doesn't an installed version of a jre need a couple of dlls plus some new registry entries?, this contradicts common sense, if I'm not wrong, that Readme is a nonsense, but since that readme is at each of us jre installation \java\jdk1.x\jre\Readme, it can't be a nonsense, therefore I'm wrong, therefore the answer is either Way 1 or Way 2, HOW? ... or maybe there's a Way 3?
(2) Say I never read that Readme so I download the jre (as an exe) to bundle it along with my application in a jar ... now I'll give my neighbor either a jar with two exes or two exes jars ... is there a way to make a jar so that two files get executed? ... if the answer is No and I have competition from a second neighbor, then I believe I'm asking my first neighbor to choose my application based on our friendship, that's not reasonable if we are doing business, so Java loses.
(3) Say that my application is a single executable file like this,
class X{
public static void main(String[]$$$){
System.out.println("Console, where are you?");
At this point, say that my neighbor accepted the two executables, he executed the jre.exe and has jre6 in his system, now he double clicks on my X.jar ... it's a console application and jar files are not associated with the java.exe launcher since java 5, but with javaw which doesn't open any console ... how do i make it so a console opens and prints "Console, where are you?" ... do I ask my neighbor-customer to add a couple of lines to his path and open his console and (please) enter java -jar jarfile.jar? ... isn't it too much? ... i hope i'm wrong cause this is kind of discouraging
(4) I've read that by installing a more recent version of a jre on a system that has an older jre (there to help other applications work), I might be causing a problem for the other applications to run ... I guess that's the reason why that Readme kind of encourage to redistribute a "private" version of a jre (one that doesn't come with a java.exe launcher ... any feedback on this?
(5) I'm reading a lot of hype about Java Web Start ... it looks better than the traditional jar/jre deployment ... but setting up a MIME type to *.jnlp, it doesn't come with some free hosting I've checked ... somebody can recommend a free hosting service that allows to set a *.jnlp MIME? (I'll appreciate a suggestion here, cause I would like to test Web Start)... and, anyhow, how you people compare it with the paradigm of the single executable file?.
Thanks. Your feedback is highly appreciated.jorgelbanda wrote:
..(5) I'm reading a lot of hype about Java Web Start ... It's gratifying to think that someone who wants to deploy apps., has the common sense to search first! You would not guess how I often I hear "I wanna' make an EXE" shortly followed by "What's webstart?".
...it looks better than the traditional jar/jre deployment ... but setting up a MIME type to .jnlp, it doesn't come with some free hosting I've checked ... OK. You cannot define new mime types, but perhaps the site already has it defined. An easy way to check is to upload 'any old file' that ends in .jnlp and use the [mime type checker|http://pscode.org/mime/] to see what content type it is served as.
..somebody can recommend a free hosting service that allows to set a .jnlp MIME? (I'll appreciate a suggestion here, cause I would like to test Web Start)... I'm pretty sure the Google based sites offer it.
Note that I edited the asterisks out of your post, to avoid the forum software parsing half the reply as bold. -
Question about Java Applet Jar file signing.
These questions pertain to Java 6 Standard Edition 1.6.0_22-b04 and later.
I have gone through the Oracle Java Tutorial for generate public and private key information
to sign a jar file, and how to sign the jar itself, all at
[http://java.sun.com/developer/onlineTraining/Programming/JDCBook/signed.html|http://java.sun.com/developer/onlineTraining/Programming/JDCBook/signed.html]
, and seek some clarification on the following related questions:
-In order to "escape" the java applet sandbox that exists around the client's
copy of the applet running in their web browser, ie.
(something forbidden by default), is verification of the signed applet enough, or is a policy file required
to stipulate these details?
-using the policytool policy file generator, what do I need to add under "Principals"
(if anything) when dealing with a Java applet? Are Codebase and SignedBy simply author information?
-If I choose to use a java.security.Permission subclass object set up in equivalent fashion within the Applet,
which class within the Applet jar do I instantiate that object in? Does it need to be mentioned
in the applet's jar Manifest.MF file?
-Is the "keystore database" a java language service/process which runs in
the Server's memory and is simply accessed and started by default
by the client verifier program (appletview/web browser)?
-The public key certificate file (*.cer) is put in the webserver directory holding
the Applet jar file (ie. Apache Tomcat, for example).
-Presumably, the web browser detects the signed jar
and certificate file, and provides the browser pop up menu asking the user
about a new, non recognised certificate (initially).
Is this so?
-With this being the case, can the applet now escape
the sandbox, be it with or without the stipulated
policy permissions?848439 wrote:
-In order to "escape" the java applet sandbox that exists around the client's
copy of the applet running in their web browser, ie.
(something forbidden by default), is verification of the signed applet enough, or is a policy file required
to stipulate these details?Just sign the applet, the policy file is not necessary.
-Is the "keystore database" a java language service/process which runs in
the Server's memory and is simply accessed and started by default
by the client verifier program (appletview/web browser)?No.
-The public key certificate file (*.cer) is put in the webserver directory holding
the Applet jar file (ie. Apache Tomcat, for example).No. For a signed Jar, all the information is contained inside the Jar.
-Presumably, the web browser detects the signed jar
and certificate file, and provides the browser pop up menu asking the user
about a new, non recognised certificate (initially).
Is this so?No. It is the JVM that determines when to pop the confirmation dialog.
-With this being the case, can the applet now escape
the sandbox, ..Assuming the end-user OK's the trust prompt, yes.
..be it with or without the stipulated
policy permissions?Huh?
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