Java applet in firefox linux makes Java application launcher crash/exit

Question

I have a Java applet that downloads data from where it's hosted, using HTTP. The applet has default permissions for an applet, that is, not many. Randomly during download, maybe 90% chance of reproductibility, at a specific part of the log, the java executable hosted by Firefox will exit abruptly, and the Java Console will be closed.

I thought it was my first JVM crash after just a few weeks of Java, but could not find the Fatal Error Log. Until I found out that when Chromium is used to open the applet, it works 100% (many tries in various conditions, alterning with Firefox)

Both browsers execute use the same commandlines for the java executable

Firefox:  /usr/lib/jvm/java-6-sun-1.6.0.26/jre/bin/java -D__jvm_launched=20972388862 -Xbootclasspath/a:/usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/deploy.jar:/usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/javaws.jar:/usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/plugin.jar -Djava.class.path=/usr/lib/jvm/java-6-sun-1.6.0.26/jre/classes -Dsun.awt.warmup=true sun.plugin2.main.client.PluginMain write_pipe_name=/tmp/.com.sun.deploy.net.socket.5712.287531591049678510.AF_UNIX
Chromium: /usr/lib/jvm/java-6-sun-1.6.0.26/jre/bin/java -D__jvm_launched=20858056974 -Xbootclasspath/a:/usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/deploy.jar:/usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/javaws.jar:/usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/plugin.jar -Djava.class.path=/usr/lib/jvm/java-6-sun-1.6.0.26/jre/classes -Dsun.awt.warmup=true sun.plugin2.main.client.PluginMain write_pipe_name=/tmp/.com.sun.deploy.net.socket.5428.6724684151611746860.AF_UNIX

Then I booted a Windows 2000 partition and also noticed that the applet was working 100% with the same version of Firefox and JRE. Could not try Chrome, not available on this platform.

Now I'm not necessarily asking for a solution as my 'client' will use Windows 2000 to run the applet. I was posting this to know if someone experimented with java crashes could find an explanation to this. Is it the communication between Firefox Linux and java that could make java exit? If you had to make this work, how would you proceed? Try to produce an SSCCE for Mozilla?

Versions:

Firefox 9.0.1 (both on Linux and Windows 2000)
Chromium 9.0.597.45 (70550) Built on Debian 6.0, running on Debian 6.0.2
java version "1.6.0_26"
Java(TM) SE Runtime Environment (build 1.6.0_26-b03)
Java HotSpot(TM) Client VM (build 20.1-b02, mixed mode, sharing)

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EDIT: I found more information. When listening to Firefox's stderr, running the applet and then exiting Firefox after java exits, I get this. Not so useful though, it just tends to show that Firefox didn't even know that java exited.

Exception in thread "main" netscape.javascript.JSException: Plugin instance for applet ID 1 was already released
at sun.plugin2.main.server.LiveConnectSupport.getInfo(LiveConnectSupport.java:405)
at sun.plugin2.main.server.LiveConnectSupport.shutdown(LiveConnectSupport.java:41)
at sun.plugin2.main.server.JVMInstance.unregisterApplet(JVMInstance.java:1300)
at sun.plugin2.main.server.JVMInstance.recycleAppletID(JVMInstance.java:385)
at sun.plugin2.main.server.JVMManager.recycleAppletID(JVMManager.java:316)
at sun.plugin2.main.server.MozillaPlugin.stopApplet(MozillaPlugin.java:325)
at sun.plugin2.main.server.MozillaPlugin.destroy(MozillaPlugin.java:225)

Answer 1

Try to produce an SSCCE for Mozilla?

Yes. (I recommend that.)

You will need it for a bug report to either Oracle or Mozilla. Unless reported, problems do not get fixed.