I just posted an answer to this question over at http://ubuntuforums.org/showthread.php?p=11757928
The WebEx applet uses a proprietary native module to access the sound software. It is a 32-bit .so, so it cannot be loaded by a 64-bit JVM. The usual solution seems to be to run a 32-bit browser any time you are using WebEx. As an alternative, I have patched the nspluginwrapper utility so that you can run a 32-bit Java plugin from a 64-bit browser (I've tested with Firefox, it should also work with Chrome).
Download the latest sources for nspluginwrapper from http://nspluginwrapper.org/download/
Expand the file (tar -xvzf) in a convenient location
Apply the following patch to the file npw-viewer.c:
--- npw-viewer.c 2011-06-30 23:18:57.000000000 -0400
+++ nspluginwrapper-1.4.4/src/npw-viewer.c 2012-03-11 14:09:35.104158681 -0400
@@ -5128,6 +5128,17 @@
}
handles[n_handles++] = handle;
dlerror();
+#else
+ /* Install libstdc++ for java */
+ const char libstcpp[] = "libstdc++.so.6";
+ D(bug(" trying to open standard C++ runtime '%s'\n", libstcpp ));
+ if ((handle = dlopen(libstcpp, RTLD_LAZY|RTLD_GLOBAL)) == NULL) {
+ npw_printf("ERROR: %s\n", dlerror());
+ return 1;
+ }
+ handles[n_handles++] = handle;
+ dlerror();
+
#endif
D(bug(" %s\n", plugin_path));
if ((handle = dlopen(plugin_path, RTLD_LAZY)) == NULL) {
You may need to get some additional libraries to make things work. In particular, I installed:
sudo apt-get install libcurl4-nss-dev libxt-dev libgtk2.0-dev g++-multilib
YMMV.
After getting the dependencies, its:
./configure
make
sudo make install
Then you will need a 32-bit jre. This can be downloaded from Oracle's website and installed.
Finally, locate the file libnpjp2.so in the lib directory of the 32-bit Java installation. I found it in /usr/lib/jvm/ia32-java-6-sun/jre/lib/i386/.
Execute
sudo nspluginwrapper -i /usr/lib/jvm/ia32-java-6-sun/jre/lib/i386/libnpjp2.so
(Or wherever your Java was installed.)
Then (re) start Firefox. Type "aboutlugins" in the address bar. You should see your newly installed 32-bit Java plugin.
Try joining a WebEx meeting with sound
Best Answer
Last evening I ran in the same trouble. Ubuntu 12.04 with OpenJDK 7. I had no error message but the incoming audio was mute or only working for a few seconds. I figured out that it seems to be a problem with the alsa plugin for java and pulseaudio. After removing pulseaudio like in these link
http://www.hecticgeek.com/2012/01/how-to-remove-pulseaudio-use-alsa-ubuntu-linux/
it worked fine.
Maybe these topics are related with this problem
http://pl.digipedia.org/usenet/thread/11149/13875/
but this is far above my understanding.
Hope this helps, Tobias