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[final Beta 5.5 build] Used debugger and then finished it through Finish Debug Session button in toolbar. Strange is that the session finished but there stayed current program counter (green line in editor). After a while (half or a minute) the exception dialog with following exception appeared.
Created attachment 30472 [details] Exception stack attached...
It's strange that it took so long to remove the annotation. Can you reproduce this somehow? I was not able to get this exception. However, the annotations are updated with some delay (but it's 500ms), so an exception like this can occur. But I've never seen it. Perhaps it's the strange taskRemove.cancel(); and subsequent creation of a new task, what caused the annotation not to be removed sooner.
This appeared just once, I am not able to reproduce it anymore - perhaps some not very frequent circumstances happened.
Changing TM for open issues.
Fixed after the fix of issue #137310.
Verified ... and Closing all issues resolved into NetBeans 6.7 and earlier.