The OggHandler tests for "navigator.javaEnabled()" and for the existence of the MIME-type "application/x-java-applet". The second test fails, if Opera directly access Java and not uses a java plugin dll. I think the first test is sufficient, because Java isn't a plugin in every browser but could be supported natively (like in Opera).
Version: unspecified
Severity: normal
OS: Windows Vista
Platform: PC