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While creating a nested class I used code completion to finish writing an assignment statement to one of the nested class members. Code completion within the nested class appears to make this happen.
Created attachment 17663 [details] Log file generated by netbeans on exception
The problem with UnsupportedOperationExceptions that originate in the code completion calls is already fixed (see issue #46918). Other exceptions in the attached log originate in the java module. Reassigning for further evaluation.
I filed a separate issue 50067 for ArrayIndexOutOfBounds exception from CallableImpl. Other exceptions in the log should be fixed.