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Try to install Findbugs plugin from www.nbextras.org or from http://fnleisurehacker.fn.funpic.de/wordpress/?page_id=102 and run it on ant/debugger sources. Some parts of the output really looks like possible problems - impossible cast in AntDebugger.java:573, calls to new String(String) and related use of == to compare strings, use of notify().
Right, this is a defect in the code. Findbugs is handy, thanks.
This does not seem to cause real problems yet, scheduling for future...
I've already fixed some. The rest is wontfix.
v/c