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Ok, that is a good sign. That confirms that somewhere in the code, there is a conflict (or multiple conflicts). Now we just need to find it. The first thing you should do is swap the final keyword...

Ok. Well the first thing I would do is get rid of all of the extra stuff that may or may not be creating conflicts, since ruling that possibility out is the fastest thing to do right now.

So, use...

Try using the new JScrollPane(tree); constructor instead of the new JScrollPane(); constructor, and tell me if that does anything.

What is happening (or not happening) that shouldn't (or should)?