If you start Opera from the console you may see the following error message if java doesn't work correctly:
ERROR: ld.so: object 'libjvm.so' from LD_PRELOAD cannot be preloaded: ignored.
ERROR: ld.so: object 'libawt.so' from LD_PRELOAD cannot be preloaded: ignored.
To fix this, correct the Java path under Tools -> Preferences -> Advanced Tab -> Content -> Java options. It should look similar to this:
/usr/lib/jvm/java-1.5.0-sun-1.5.0.06/jre/lib/i386/
Check your installed Java pathways and change accordingly.
