I'm not sure if this does not fit into debuggercore, if so, please reassign. The
bug occured after the debugger stopped on a breakpoint; no watches were defined
at the time, however variable tab was selected. The debuggee stoped with a
message in the status bar. After the exception was thrown, current PC line was
not highlighted - but the debugger responded to CTRL-F5. When the same
breakpoint was hit a while after, everything was OK.

java.util.NoSuchElementException
        at java.util.WeakHashMap$1.next(WeakHashMap.java:384)
        at java.util.AbstractMap$2.next(AbstractMap.java:368)
        at java.util.AbstractCollection.toArray(AbstractCollection.java:173)
        at java.util.ArrayList.<init>(ArrayList.java:121)
        at
org.netbeans.modules.debugger.support.util.Validator.validate(Validator.java:71)
        at
org.netbeans.modules.debugger.support.AbstractDebugger.updateWatches(AbstractDebugger.java:806)
        at
org.netbeans.modules.debugger.support.AbstractThread.setCurrent(AbstractThread.java:204)
        at
org.netbeans.modules.debugger.jpda.JPDADebugger$7.run(JPDADebugger.java:1028)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:154)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:331)
[catch] at
java.awt.EventDispatchThread.pumpOneEvent(EventDispatchThread.java:103)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:84)