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instance of NbEditorDocument is held in memory after all documents are closed. Please see NbEditorDocument instance #6 in the heap dump Which will be attached in few minutes for exact path to gc root.
the heap dump is available at: https://netbeans.org/projects/performance/downloads/download/heapdumps/heapdump_memleak_xml.hprof.7z
*** This bug has been marked as a duplicate of bug 240111 ***