On my G5 they don't seem to play nice. I cleaned up my cache and created new project and made my target JDK to be 1.4.. and it croaks while loading the classes (allways at this class: sun/corba/se/internal/iiop/CDROutputStream_1_0.class).
Switched to JDK 1.3 and seems to work fine. Any OS X people having same issue? BTW, I never installed the quicktime java update so never had any issues with the JDK.