nspluginviewer crashed while trying to load a Java applet

Binary package hint: konqueror

konqueror:
  Installiert: 4:4.2.0-0ubuntu1~intrepid1~ppa2

In addition:
Installed java jre:

sun-java6-jre:
  Installiert: 6-10-0ubuntu2

openjdk-6-jre:
  Installiert: 6b12-0ubuntu6.1

I am sorry not to be able to figure out in the moment how to see which one is actually used... Hm!

I was trying to load a java applet in Konqueror. Goal of the applet is to be a drag & drop uploader for box.net
I couldn't get it to work... but it also crashed.

This is the backtrace:

Eine korrekte Rückverfolgung ist nicht möglich.
Wahrscheinlich sind die Dateien Ihres Systems in einer Weise erstellt worden, die eine solche Rückverfolgung (Backtrace) nicht erlaubt. Oder der so genannte „Stack Frame“ für das Programm wurde durch den Absturz unbrauchbar gemacht.

[Thread debugging using libthread_db enabled]
[New Thread 0xb607c6c0 (LWP 10323)]
[New Thread 0xb0c37b90 (LWP 10410)]
[New Thread 0xb1f77b90 (LWP 10334)]
[New Thread 0xb2778b90 (LWP 10333)]
0xb7f33430 in __kernel_vsyscall ()
[Current thread is 0 (LWP 10323)]

Thread 4 (Thread 0xb2778b90 (LWP 10333)):
#0 0xb7f33430 in __kernel_vsyscall ()
#1 0xb6329075 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2 0xb65ffbbd in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3 0xb3ff36cf in ?? () from /usr/lib/firefox/plugins/flashplugin-alternative.so
#4 0xb41251ef in ?? () from /usr/lib/firefox/plugins/flashplugin-alternative.so
#5 0xb3ff3b7d in ?? () from /usr/lib/firefox/plugins/flashplugin-alternative.so
#6 0xb632550f in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7 0xb65f1a0e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 3 (Thread 0xb1f77b90 (LWP 10334)):
#0 0xb7f33430 in __kernel_vsyscall ()
#1 0xb6329075 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2 0xb65ffbbd in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3 0xb3ff36cf in ?? () from /usr/lib/firefox/plugins/flashplugin-alternative.so
#4 0xb41251ef in ?? () from /usr/lib/firefox/plugins/flashplugin-alternative.so
#5 0xb3ff3b7d in ?? () from /usr/lib/firefox/plugins/flashplugin-alternative.so
#6 0xb632550f in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7 0xb65f1a0e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 2 (Thread 0xb0c37b90 (LWP 10410)):
#0 0xb7f33430 in __kernel_vsyscall ()
#1 0xb63293a2 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2 0xb65ffc14 in pthread_cond_timedwait () from /lib/tls/i686/cmov/libc.so.6
#3 0xb70ec6cc in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#4 0xb70e1886 in ?? () from /usr/lib/libQtCore.so.4
#5 0xb70eb6ae in ?? () from /usr/lib/libQtCore.so.4
#6 0xb632550f in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7 0xb65f1a0e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb607c6c0 (LWP 10323)):
#0 0xb7f33430 in __kernel_vsyscall ()
#1 0xb65acf36 in nanosleep () from /lib/tls/i686/cmov/libc.so.6
#2 0xb65acd4e in sleep () from /lib/tls/i686/cmov/libc.so.6
#3 0xb775fd72 in KCrash::startDrKonqi (argv=0xbfb31aa4, argc=17) at /build/buildd/kde4libs-4.2.0/kdeui/util/kcrash.cpp:412
#4 0xb7760734 in KCrash::defaultCrashHandler (sig=11) at /build/buildd/kde4libs-4.2.0/kdeui/util/kcrash.cpp:337
#5 <signal handler called>
#6 0xb3baf4cd in gdk_window_new () from /usr/lib/libgdk-x11-2.0.so.0
#7 0xb3d660a3 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#8 0xb3a633d4 in g_cclosure_marshal_VOID__VOID () from /usr/lib/libgobject-2.0.so.0
#9 0xb3a543c9 in ?? () from /usr/lib/libgobject-2.0.so.0
#10 0xb3a55c4b in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#11 0xb3a6b8ee in ?? () from /usr/lib/libgobject-2.0.so.0
#12 0xb3a6d7ac in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#13 0xb3a6dc26 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#14 0xb3e56e31 in gtk_widget_realize () from /usr/lib/libgtk-x11-2.0.so.0
#15 0xb3e689a8 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#16 0xb3d64b5c in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#17 0xb3a633d4 in g_cclosure_marshal_VOID__VOID () from /usr/lib/libgobject-2.0.so.0
#18 0xb3a543c9 in ?? () from /usr/lib/libgobject-2.0.so.0
#19 0xb3a55c4b in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#20 0xb3a6b8ee in ?? () from /usr/lib/libgobject-2.0.so.0
#21 0xb3a6d7ac in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#22 0xb3a6dc26 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#23 0xb3e57ecc in gtk_widget_show () from /usr/lib/libgtk-x11-2.0.so.0
#24 0xb3fe695f in ?? () from /usr/lib/firefox/plugins/flashplugin-alternative.so
#25 0xb3fdc4d1 in ?? () from /usr/lib/firefox/plugins/flashplugin-alternative.so
#26 0xb3fe0cf4 in ?? () from /usr/lib/firefox/plugins/flashplugin-alternative.so
#27 0x08050898 in NSPluginInstance::NPSetWindow (this=0x0, window=0xbfb32844) at /build/buildd/kdebase-4.2.0/apps/nsplugins/viewer/nsplugin.cpp:1017
#28 0x0805e3dc in PluginHost::setupPluginWindow (this=0x9b615c8, plugin=0x9b8ed80, winID=0x2403433, width=92, height=28) at /build/buildd/kdebase-4.2.0/apps/nsplugins/viewer/pluginhost.cpp:54
#29 0x0805d99e in PluginHostXEmbed::resizePlugin (this=0x9b615c8, pluginWinId=171966467, w=92, h=28) at /build/buildd/kdebase-4.2.0/apps/nsplugins/viewer/pluginhost_xembed.cpp:51
#30 0x080502fe in NSPluginInstance::resizePlugin (this=0x9b8ed80, clientWinId=171966467, w=92, h=28) at /build/buildd/kdebase-4.2.0/apps/nsplugins/viewer/nsplugin.cpp:937
#31 0x0805eb24 in InstanceAdaptor::qt_metacall (this=0x9b8eb60, _c=QMetaObject::InvokeMetaMethod, _id=3, _a=0xbfb32aa8)
    at /build/buildd/kdebase-4.2.0/obj-i486-linux-gnu/apps/nsplugins/viewer/instanceadaptor.cpp:57
#32 0xb7d2e26e in ?? () from /usr/lib/libQtDBus.so.4
#33 0xb7d2f5a1 in ?? () from /usr/lib/libQtDBus.so.4
#34 0xb7d2f9b1 in ?? () from /usr/lib/libQtDBus.so.4
#35 0xb7d2feaa in ?? () from /usr/lib/libQtDBus.so.4
#36 0xb71eb771 in QObject::event () from /usr/lib/libQtCore.so.4
#37 0xb68cc8ec in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#38 0xb68d472e in QApplication::notify () from /usr/lib/libQtGui.so.4
#39 0xb76effed in KApplication::notify (this=0xbfb333c0, receiver=0x9b8ed80, event=0x9be6af0) at /build/buildd/kde4libs-4.2.0/kdeui/kernel/kapplication.cpp:307
#40 0xb71dbe61 in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#41 0xb71dcae5 in QCoreApplicationPrivate::sendPostedEvents () from /usr/lib/libQtCore.so.4
#42 0xb71dccdd in QCoreApplication::sendPostedEvents () from /usr/lib/libQtCore.so.4
#43 0xb720682f in ?? () from /usr/lib/libQtCore.so.4
#44 0xb7c8b6f8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#45 0xb7c8eda3 in ?? () from /usr/lib/libglib-2.0.so.0
#46 0xb7c8ef61 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#47 0xb7206478 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#48 0xb6966ea5 in ?? () from /usr/lib/libQtGui.so.4
#49 0xb71da52a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#50 0xb71da6ea in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#51 0xb71dcda5 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#52 0xb68cc767 in QApplication::exec () from /usr/lib/libQtGui.so.4
#53 0x0805c8b0 in main (argc=) at /build/buildd/kdebase-4.2.0/apps/nsplugins/viewer/viewer.cpp:144
#0 0xb7f33430 in __kernel_vsyscall ()