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I think the only way to 'fix' it is by reinstalling. A quick google for 'java.lang.ClassFormatError: Extra bytes at the end of class file' suggests it is likely caused by the class file being corrupted.
There is also a result in there that matches your question really closely:
The 'solution' here was to go back from Java 6 to Java 5 - I read that differently, this user reinstalled the JDK and things started to work. The fact that he went back to Java 5 probably has very little to do with it.
Well, I have already tried reinstalling 1.6 jdk about 3 times and it had no effect on Wtk2.2.
I'm trying to avoid going back to 1.5 or switching to 1.7.
My last hope is step-by-step guide on installing wtk2.2 manually, by copying each lib to the destination folders.
The problem is that I don't know if this is possible at all.