[ BUILD # : 20051013 ]
[ JDK VERSION : 1.5.0_03 ]

What i have done that bring this Exception is :
I was working in IDE 
I used refactoring  capability (encapsulate field) over one boolean field
it show the progress bar which allways in refactoring shown
I just played a bit with that progress bar (move it to right and left)
refactoring finished and the exception raised.

The screen shot shows that i was working on a propertychange method , 
when i put the mouse in blue line which indicate the end of that method
exception window raise again , 
I checked with other sections of code and i see that exception raise when i put
the mouse and cursor ove other  } lines, in the end of a method definition which has no {} yet , it raise again when i invoke code completer 
for : e.g setChanged(

If i put mouse elsewhere than the mentioned lines and then press ok , the exception goes away , but as soon as i put the cursor on } lines 
exception come again


if I put the pointer over and End line ----> } , the exception shows in consistent way (as more i press ok , as more it shows)

I attached the log file + an screenshot
hope they helps