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The attached ClassCastException is thrown when the editor content is refreshed (in my case, the refresh is initiated by the ant task "nbinstaller").
Created attachment 10620 [details] The thrown exception
*** Issue 34277 has been marked as a duplicate of this issue. ***
It looks like opneide issue. Reassigning.
*** This issue has been marked as a duplicate of 27773 ***
verified, closed - it's duplicate.