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While invoking completion within <artifactId> tag in the maven pom editor of a NetBeans IDE guest istance launched from a NetBeans host instance I got on the output window the following exception stack trace. The completion afterwards recovered and worked. INFO [org.netbeans.spi.lexer.MutableTextInput]: !!WARNING!! Missing READ-LOCK when accessing TokenHierarchy: input-source:org.netbeans.modules.editor.NbEditorDocument@45c3e8b8, mimeType='text/x-maven-pom+xml', kitClass=null, length=2165, version=3, file=org.netbeans.modules.maven.grammar.POMDataObject@455d148c[/home/afalappa/Sviluppo/nb81-prjdir/demo1/pom.xml@d0154b6a:677c77fa] java.lang.Exception at org.netbeans.lib.lexer.TokenHierarchyOperation.ensureReadLocked(TokenHierarchyOperation.java:406) at org.netbeans.lib.lexer.TokenHierarchyOperation.tokenSequence(TokenHierarchyOperation.java:431) at org.netbeans.lib.lexer.TokenHierarchyOperation.tokenSequence(TokenHierarchyOperation.java:427) at org.netbeans.api.lexer.TokenHierarchy.tokenSequence(TokenHierarchy.java:186) at org.netbeans.modules.xml.text.completion.XMLCompletionQuery.shouldCloseTag(XMLCompletionQuery.java:468) at org.netbeans.modules.xml.text.completion.XMLCompletionQuery.queryValues(XMLCompletionQuery.java:351) at org.netbeans.modules.xml.text.completion.XMLCompletionQuery.query(XMLCompletionQuery.java:127) at org.netbeans.modules.xml.text.completion.XMLCompletionProvider$Query.query(XMLCompletionProvider.java:124) at org.netbeans.spi.editor.completion.support.AsyncCompletionTask.run(AsyncCompletionTask.java:223) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1443) at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68) at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303) at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2058)
could not reproduce with NetBeans build 20170221-111f1ab05253 feel free to reopen if this still occurs with a current build