Well, it does work, but if you try to enter Tools/Preferences, it generates bunch of exceptions and you don't get a dialog.
Created attachment 109678 [details, diff] Patch for fixing WindowConstants.EXIT_ON_CLOSE Problem was in wrong/missing constant used in dialog creation. Java 1.6 now checks this...
Thank you for reporting and for the patch. I updated the ebuild in CVS so it will hit the tree in about 4 hours.