java.lang.AssertionError: CloneableEditorSupport.getOpenedPanes() must be called from AWT thread only
        at org.openide.text.CloneableEditorSupport.getOpenedPanes(CloneableEditorSupport.java:1059)
        at org.netbeans.modules.mobility.editor.DocumentPreprocessor.repaintDocument(DocumentPreprocessor.java:214)
        at org.netbeans.modules.mobility.editor.DocumentPreprocessor.updateBlockChain(DocumentPreprocessor.java:206)
        at org.netbeans.modules.mobility.editor.DocumentPreprocessor.<init>(DocumentPreprocessor.java:117)
        at org.netbeans.modules.mobility.editor.pub.J2MEDataObject$J2MEEditorSupport.createEditorKit(J2MEDataObject.java:346)
        at org.openide.text.CloneableEditorSupport.prepareDocument(CloneableEditorSupport.java:596)
        at org.openide.text.CloneableEditorSupport.openDocumentImpl(CloneableEditorSupport.java:824)
        at org.openide.text.CloneableEditorSupport.openDocumentCheckIOE(CloneableEditorSupport.java:806)
        at org.openide.text.CloneableEditorSupport.openDocument(CloneableEditorSupport.java:786)
        at org.openide.text.DataEditorSupport.openDocument(DataEditorSupport.java:404)
        at org.netbeans.modules.java.hints.errors.Utilities.commitAndComputeChangeInfo(Utilities.java:272)
        at org.netbeans.modules.java.hints.errors.CreateMethodFix.implement(CreateMethodFix.java:205)
        at org.netbeans.modules.editor.hints.HintsUI$1.run(HintsUI.java:573)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:573)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1005)