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I have been seeing such exceptions from time to time in dev builds. Not using the debugger at all, note. Just editing some Java sources and running them. JDK 1.5.0b51, Linux.
Created attachment 15325 [details] Some representative stack traces
fixed in the main trunk: Checking in ant/src/org/netbeans/modules/debugger/projects/ContextProviderImpl.java; /cvs/debuggerjpda/ant/src/org/netbeans/modules/debugger/projects/ContextProviderImpl.java,v <-- ContextProviderImpl.java new revision: 1.16; previous revision: 1.15 done
Verified ... and Closing all issues resolved into NetBeans 6.7 and earlier.