Red Hat Bugzilla – Bug 492704
new NoClassDefFoundError exceptions
Last modified: 2009-12-18 04:07:52 EST
(I think this is openjdk 1.6 -- how can I be sure? Firefox plugins lists IcedTea web browser plugin 1.4 (fedora-13.b14.fc10-x86_64)) Description of problem: I have some applets that used to work and still work on other machines but that now don't start - I see this: Exception in thread "Applet" java.lang.NoClassDefFoundError: diamondedge/vb/TitledPanel at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:637) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at java.net.URLClassLoader.defineClass(URLClassLoader.java:277) at java.net.URLClassLoader.access$000(URLClassLoader.java:73) at java.net.URLClassLoader$1.run(URLClassLoader.java:212) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:205) at java.lang.ClassLoader.loadClass(ClassLoader.java:323) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294) at java.lang.ClassLoader.loadClass(ClassLoader.java:268) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:336) at java.lang.Class.getDeclaredConstructors0(Native Method) at java.lang.Class.privateGetDeclaredConstructors(Class.java:2406) at java.lang.Class.getConstructor0(Class.java:2716) at java.lang.Class.newInstance0(Class.java:343) at java.lang.Class.newInstance(Class.java:325) at net.sourceforge.jnlp.Launcher.createApplet(Launcher.java:458) at net.sourceforge.jnlp.Launcher.getApplet(Launcher.java:418) at net.sourceforge.jnlp.Launcher$TgThread.run(Launcher.java:597) Caused by: java.lang.ClassNotFoundException: diamondedge.vb.TitledPanel at java.net.URLClassLoader$1.run(URLClassLoader.java:217) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:205) at java.lang.ClassLoader.loadClass(ClassLoader.java:323) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294) at java.lang.ClassLoader.loadClass(ClassLoader.java:268) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:336) ... 20 more java.lang.NullPointerException at net.sourceforge.jnlp.NetxPanel.runLoader(NetxPanel.java:97) at sun.applet.AppletPanel.run(AppletPanel.java:380) at java.lang.Thread.run(Thread.java:636) java.lang.NullPointerException at sun.applet.AppletPanel.run(AppletPanel.java:430) at java.lang.Thread.run(Thread.java:636) I wonder if this could be a case problem, since the file vbc.jar does claim to contain diamondedge/vb/titledpanel.class Version-Release number of selected component (if applicable): Is this it? java-1.6.0-openjdk-1.6.0.0-13.b14.fc10.x86_64 How reproducible: Try this in your browser (I'm using firefox) http://saturnids.spicenet.net/sonario/develop081125/develop081125-mysql.html It'll complain about signatures - click run Actual results: the class not found exception Expected results: it should run - should show a login panel Additional info:
After reboot (unrelated, accidental) the url above now seems to work again. Any info about what could possibly have caused the problem will still be appreciated.
It worked for me on first try. Hard to say why it is working after a reboot suddenly though. There is no reason I can think of where reboot would make a difference. When you were getting the class not found issues initially, had you tried restarting the browser?
It's hard to find a transcript now that I've rebooted, but I'm pretty sure I did try restarting the browser several times. At least once was in order to get new copies of the jars downloaded after touching them on the server - my theory at that point was that the jar was corrupted.
Hmm, weird. A corrupted jar would have been redownloaded on the next try after restart, as the plugin verifies the size each time the browser is restarted. Well, in any case. Glad it is working now. I am going to close this. If you encounter it again, feel free to reopen.
Ok, it's back. I have a new theory. This seems to be related to trying to exit firefox. For reasons I don't understand, the normal exit is not working: the window goes away but when I try to restart I get a complaint that it's still running. $ ps laxww|grep fire 0 0 6371 3246 20 0 85000 784 pipe_w S+ pts/0 0:00 grep fire 0 0 15201 3246 20 0 87748 1260 wait S pts/0 0:00 /bin/sh /usr/lib64/firefox-3.0.8/run-mozilla.sh /usr/lib64/firefox-3.0.8/firefox 4 0 15218 15201 20 0 879280 232360 - Rl pts/0 12:44 /usr/lib64/firefox-3.0.8/firefox [2009-04-02 17:31:14 root@number11 ~/workspace/com.sonariov1] $ killall firefox Now when I restart firefox I get the bug above. I suspect that if I reboot it'll work again. Any ideas?
Since this seems to be reproducible (related to firefox shutdown and reboot) I reopen it.
So the way to reproduce this is to load the site, kill -9 firefox, restart it and try it then?
That's what seems to work for me. I'll be interested in hearing whether it works for you. If not, it must have something to do with my configuration. I suggest that before the kill you try exiting firefox in the normal way (file quit or the x button) and see whether that removes the process that otherwise has to be killed as above in order to restart firefox. If you don't have to kill firefox then try the url to see whether successful exit allows it to work. If so, try killing firefox to see whether the difference between quit and kill is related to the problem. I doubt that it makes any difference, but I'm running firefox from a shell (actually a shell buffer in emacs).
I still can't get it to hang. I tried loading the applet, and then reloading it after exiting normally and after kill -9. The applet always loads up fine in all cases. Additionally, exiting either way left no jvm process behind...
It occurred to me that the problem might be related to saving my tabs so I tried exiting and NOT saving them. The next time the applet worked and in fact so did the exit of firefox. Now I cannot reproduce the bug. I now think the problem is in one of those formerly saved tags. So I'll probably eventually see it again if I happen to go back to that tab. Is there some way to find out what your saved tabs USED to be? Then I could add one at a time to try to reproduce the problem.
Nope, looking at history one by one is the only way I can think of.. and yes, if there were other tabs open, there is a possibility that there was another applet running in them that froze up, which could cause the symptoms you are seeing. Okay so since this is not reproducible I am going to close this. As always if you can reproduce it, please feel free to reopen!
The problem has reappeared. I've closed all tabs, then exited firefox -- which left a running process as before which I kill as before, then restart firefox. This comes up empty, and yet the applet above (and other related applets) fails as above. Let me know if you have any ideas. I guess my next attempt would be reboot, but of course we should find any relevant info we can before doing that.
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