java.lang.Exception: Stack trace
        at java.lang.Thread.dumpStack(Thread.java:1155)
        at org.netbeans.modules.javacore.parser.ASTProvider.createASTree(ASTProvider.java:82)
        at org.netbeans.modules.javacore.parser.ASTProvider.getASTree(ASTProvider.java:307)
        at org.netbeans.modules.javacore.jmiimpl.javamodel.ResourceImpl.directUpdate(ResourceImpl.java:465)
        at org.netbeans.modules.javacore.jmiimpl.javamodel.ResourceImpl.initResource(ResourceImpl.java:328)
        at org.netbeans.modules.javacore.jmiimpl.javamodel.MetadataElement.initCheck(MetadataElement.java:122)        at org.netbeans.modules.javacore.jmiimpl.javamodel.SemiPersistentElement.getElementInfo(SemiPersistentElement.java:110)
        at org.netbeans.modules.javacore.jmiimpl.javamodel.ResourceImpl.initChildren(ResourceImpl.java:249)
        at org.netbeans.modules.javacore.jmiimpl.javamodel.ResourceImpl.initChildren(ResourceImpl.java:243)
        at org.netbeans.modules.javacore.jmiimpl.javamodel.MetadataElement.initCheck(MetadataElement.java:128)        at org.netbeans.modules.javacore.jmiimpl.javamodel.SemiPersistentElement.getElementInfo(SemiPersistentElement.java:110)
        at org.netbeans.modules.javacore.jmiimpl.javamodel.JavaClassImpl.initChildren(JavaClassImpl.java:476)
        at org.netbeans.modules.javacore.jmiimpl.javamodel.JavaClassImpl.initChildren(JavaClassImpl.java:467)
        at org.netbeans.modules.javacore.jmiimpl.javamodel.JavaClassImpl.initASTElements(JavaClassImpl.java:844)
        at org.netbeans.modules.javacore.jmiimpl.javamodel.JavaClassImpl.getInterfaceNames(JavaClassImpl.java:836)
        at org.netbeans.jmi.javamodel.JavaClass$Impl.getInterfaceNames(Unknown Source)
        at org.netbeans.modules.java.bridge.ClassElementImpl$InterfacesListener.getTypeRefs(ClassElementImpl.java:1022)
        at org.netbeans.modules.java.bridge.CallableImpl$ExceptionsListener.initElements(CallableImpl.java:588)
        at org.netbeans.modules.java.bridge.ClassElementImpl$ClassListener.connect(ClassElementImpl.java:873)
        at org.netbeans.modules.java.bridge.ClassElementImpl.connectListener(ClassElementImpl.java:97)
        at org.netbeans.modules.java.bridge.ElementImpl.attachedToElement(ElementImpl.java:414)
        at org.openide.src.Element.<init>(Element.java:56)
        at org.openide.src.MemberElement.<init>(MemberElement.java:36)
        at org.openide.src.ClassElement.<init>(ClassElement.java:93)
        at org.openide.src.ClassElement.<init>(ClassElement.java:84)
        at org.netbeans.modules.java.bridge.DefaultWrapper.wrapClass(DefaultWrapper.java:34)
        at org.netbeans.modules.java.bridge.DefaultLangModel.createTopClass(DefaultLangModel.java:160)
        at org.netbeans.modules.java.bridge.TopClassesCollection.createElement(TopClassesCollection.java:53)
        at org.netbeans.modules.java.bridge.ObjectsCollection.cachedElement(ObjectsCollection.java:70)
        at org.netbeans.modules.java.bridge.ObjectsCollection.getElements(ObjectsCollection.java:102)
        at org.netbeans.modules.java.bridge.ClassesCollection.getClasses(ClassesCollection.java:72)
        at org.netbeans.modules.java.bridge.SourceElementImpl.getClasses(SourceElementImpl.java:136)
        at org.netbeans.modules.java.bridge.SrcElementImpl.getClasses(SrcElementImpl.java:165)
        at org.openide.src.SourceElement.getClasses(SourceElement.java:227)
        at org.netbeans.modules.form.GandalfPersistenceManager.loadForm(GandalfPersistenceManager.java:252)
        at org.netbeans.modules.form.FormEditorSupport$3.run(FormEditorSupport.java:553)
        at org.netbeans.modules.form.FormLAF$1.run(FormLAF.java:58)
        at org.openide.util.Mutex.doEventAccess(Mutex.java:923)
        at org.openide.util.Mutex.readAccess(Mutex.java:202)
        at org.netbeans.modules.form.FormLAF.executeWithLookAndFeel(FormLAF.java:43)
        at org.netbeans.modules.form.FormEditorSupport.loadFormData(FormEditorSupport.java:551)
        at org.netbeans.modules.form.FormEditorSupport.loadFormDesigner(FormEditorSupport.java:508)
        at org.netbeans.modules.form.FormEditorSupport$FormDesc.createElement(FormEditorSupport.java:1141)
        at org.netbeans.core.multiview.MultiViewModel.getElementForDescription(MultiViewModel.java:182)
        at org.netbeans.core.multiview.MultiViewModel.getActiveElement(MultiViewModel.java:102)
        at org.netbeans.core.multiview.MultiViewModel.getActiveElement(MultiViewModel.java:98)
        at org.netbeans.core.multiview.MultiViewPeer.showCurrentElement(MultiViewPeer.java:180)
        at org.netbeans.core.multiview.MultiViewPeer.peerComponentOpened(MultiViewPeer.java:148)
        at org.netbeans.core.multiview.MultiViewCloneableTopComponent.componentOpened(MultiViewCloneableTopComponent.java:124)
        at org.openide.windows.WindowManager.componentOpenNotify(WindowManager.java:249)
        at org.netbeans.core.windows.WindowManagerImpl.notifyTopComponentOpened(WindowManagerImpl.java:857)
        at org.netbeans.core.windows.Central.addModeOpenedTopComponent(Central.java:536)
        at org.netbeans.core.windows.ModeImpl.addOpenedTopComponent(ModeImpl.java:249)
        at org.netbeans.core.windows.PersistenceHandler.initModeFromConfig(PersistenceHandler.java:341)
        at org.netbeans.core.windows.PersistenceHandler.getModeFromConfig(PersistenceHandler.java:268)
        at org.netbeans.core.windows.PersistenceHandler.load(PersistenceHandler.java:147)
        at org.netbeans.core.windows.PersistenceHandler.load(PersistenceHandler.java:76)
        at org.netbeans.core.windows.WindowSystemImpl.load(WindowSystemImpl.java:39)
        at org.netbeans.core.Main$5.run(Main.java:264)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:234)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)