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When you run a HintTest-based test in newer NB versions you get a bunch of warnings: … org.netbeans.lib.lexer.TokenHierarchyOperation ensureReadLocked INFO: !!WARNING!! Missing READ-LOCK when accessing TokenHierarchy: input-source:org.openide.text.FilterDocument@134a241 java.lang.Exception at org.netbeans.lib.lexer.TokenHierarchyOperation.ensureReadLocked(TokenHierarchyOperation.java:397) at org.netbeans.lib.lexer.TokenHierarchyOperation.isActive(TokenHierarchyOperation.java:357) at org.netbeans.api.lexer.TokenHierarchy.isActive(TokenHierarchy.java:356) at org.netbeans.modules.parsing.impl.event.EventSupport$DocListener.removeUpdate(EventSupport.java:306) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at org.openide.util.WeakListenerImpl$ProxyListener.invoke(WeakListenerImpl.java:458) at com.sun.proxy.$Proxy13.removeUpdate(Unknown Source) at javax.swing.text.AbstractDocument.fireRemoveUpdate(AbstractDocument.java:260) at javax.swing.text.AbstractDocument.handleRemove(AbstractDocument.java:623) at javax.swing.text.AbstractDocument$DefaultFilterBypass.remove(AbstractDocument.java:3103) at javax.swing.text.DocumentFilter.remove(DocumentFilter.java:79) at org.openide.text.CloneableEditorSupport$DocFilter.remove(CloneableEditorSupport.java:3113) at javax.swing.text.AbstractDocument.remove(AbstractDocument.java:588) at org.openide.text.FilterDocument.remove(FilterDocument.java:119) at org.netbeans.api.java.source.ModificationResult.processDocumentLocked(ModificationResult.java:429) at org.netbeans.api.java.source.ModificationResult.access$100(ModificationResult.java:96) at org.netbeans.api.java.source.ModificationResult$3.run(ModificationResult.java:394) at org.openide.text.NbDocument.runAtomicAsUser(NbDocument.java:466) at org.netbeans.api.java.source.ModificationResult.processDocument(ModificationResult.java:408) at org.netbeans.api.java.source.ModificationResult.commit2(ModificationResult.java:356) at org.netbeans.api.java.source.ModificationResult.access$000(ModificationResult.java:96) at org.netbeans.api.java.source.ModificationResult$2.run(ModificationResult.java:258) at org.openide.text.NbDocument.runAtomic(NbDocument.java:440) at org.netbeans.api.java.source.ModificationResult.commit(ModificationResult.java:255) at org.netbeans.api.java.source.ModificationResult.commit(ModificationResult.java:214) at org.netbeans.modules.java.hints.test.api.HintTest$HintWarning.doApplyFix(HintTest.java:972) at org.netbeans.modules.java.hints.test.api.HintTest$HintWarning.applyFix(HintTest.java:916) at org.netbeans.modules.java.hints.test.api.HintTest$HintWarning.applyFix(HintTest.java:906) at org.kohsuke.stapler.netbeans.plugin.MessagesHintTest.simpleString(MessagesHintTest.java:49) at … and similarly with write locks. Appears harmless (test still passes), but quite noisy and confusing.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss