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Have class named SomePage This is Wicket page class. In resources there is SomePage.html When trying to open SomePage (using Ctrl+O) at first both files are opened, but after that both are closed and exception report appears. Stacktrace: java.lang.NullPointerException at org.netbeans.modules.web.wicket.tree.AddToMarkupContainerFinder.visitMethodInvocation(AddToMarkupContainerFinder.java:91) at org.netbeans.modules.web.wicket.tree.AddToMarkupContainerFinder.visitMethodInvocation(AddToMarkupContainerFinder.java:29) at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1477) at com.sun.source.util.TreeScanner.scan(TreeScanner.java:77) at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:81) at com.sun.source.util.TreeScanner.visitTypeCast(TreeScanner.java:329) at com.sun.tools.javac.tree.JCTree$JCTypeCast.accept(JCTree.java:1821) at com.sun.source.util.TreeScanner.scan(TreeScanner.java:77) at com.sun.source.util.TreeScanner.visitReturn(TreeScanner.java:255) at com.sun.tools.javac.tree.JCTree$JCReturn.accept(JCTree.java:1390) at com.sun.source.util.TreeScanner.scan(TreeScanner.java:77) at com.sun.source.util.TreeScanner.scan(TreeScanner.java:91) at com.sun.source.util.TreeScanner.visitBlock(TreeScanner.java:162) at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:918) at com.sun.source.util.TreeScanner.scan(TreeScanner.java:77) at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:81) at com.sun.source.util.TreeScanner.visitMethod(TreeScanner.java:144) at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:800) at com.sun.source.util.TreeScanner.scan(TreeScanner.java:77) at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:81) at com.sun.source.util.TreeScanner.scan(TreeScanner.java:91) at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:99) at com.sun.source.util.TreeScanner.visitClass(TreeScanner.java:133) at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:719) at org.netbeans.modules.web.wicket.tree.JavaTreeBuilder$T.run(JavaTreeBuilder.java:165) at org.netbeans.modules.web.wicket.tree.JavaTreeBuilder$T.run(JavaTreeBuilder.java:86) at org.netbeans.api.java.source.JavaSource$MultiTask.run(JavaSource.java:493) at org.netbeans.modules.parsing.impl.TaskProcessor.callUserTask(TaskProcessor.java:593) at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:155) at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:139) at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:206) at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:203) at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:176) at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360) at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:74) at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:203) at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:106) at org.netbeans.api.java.source.JavaSource.runUserActionTaskImpl(JavaSource.java:443) at org.netbeans.api.java.source.JavaSource.runUserActionTask(JavaSource.java:414) at org.netbeans.modules.web.wicket.tree.JavaTreeBuilder.analyze(JavaTreeBuilder.java:71) at org.netbeans.modules.web.wicket.verification.WicketProblemAnnotationProvider.annotate(WicketProblemAnnotationProvider.java:186) at org.netbeans.modules.web.wicket.verification.WicketProblemAnnotationProvider.annotate(WicketProblemAnnotationProvider.java:175) at org.netbeans.modules.web.wicket.verification.WicketProblemAnnotationProvider.annotate(WicketProblemAnnotationProvider.java:118) at org.netbeans.modules.web.wicket.verification.WicketProblemAnnotationProvider.annotate(WicketProblemAnnotationProvider.java:88) at org.openide.text.CloneableEditorSupport.ensureAnnotationsLoaded(CloneableEditorSupport.java:392) at org.openide.text.CloneableEditorInitializer.initAnnotations(CloneableEditorInitializer.java:634) [catch] at org.openide.text.CloneableEditorInitializer.run(CloneableEditorInitializer.java:351) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1423) at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)
Looks like plugin http://plugins.netbeans.org/PluginPortal/faces/PluginDetailPage.jsp?pluginid=3586 caused problems. Uninstalling plugin fixed issue.
*** This bug has been marked as a duplicate of bug 156853 ***