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Observed on my console several times. No idea how to reproduce.
Created attachment 15446 [details] Stack trace
Happened to me again (040603), in different circumstances, after which I kept on getting exceptions from code completion and had to shut down and restart. Again, no idea how to reproduce; didn't seem to be doing anything unusual, just editing a unit test and running it, which had worked a number of types in the past fifteen minutes or so without problems.
Created attachment 15466 [details] Log excerpt
Happened again. I was just editing a couple of classes and moving some methods around. The classes were uncompilable for a while - probably not syntax errors, but missing imports, missing impls of abstract methods, that sort of thing. After it starts happening, the IDE is pretty well broken - any reparse in the editor causes the exceptions to start popping up again. You can't continue working until you restart.
Moved to new subcomponent java/javacore.
*** Issue 44794 has been marked as a duplicate of this issue. ***
Can be duplicate of issue 46208
Based on the stacktraces it seems that the problems were caused by bugs in elements matching in javacore and some other bugs causing storage inconsistencies. The bugs were fixed some time ago. Please file a new issue in case you experience IOE again.
Reorganization of java component