java.lang.NullPointerException at org.eclipse.ui.internal.PopupMenuExtender.dispose(PopupMenuExtender.java:547) at org.eclipse.ui.part.MultiPageEditorSite.dispose(MultiPageEditorSite.java:217) at org.eclipse.ui.part.MultiPageEditorPart$9.run(MultiPageEditorPart.java:1020) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.ui.part.MultiPageEditorPart.disposePart(MultiPageEditorPart.java:1015) at org.eclipse.ui.part.MultiPageEditorPart.dispose(MultiPageEditorPart.java:506) at com.vaadin.visualdesigner.eclipse.editors.VaadinEditor.dispose(VaadinEditor.java:269) at org.eclipse.ui.internal.e4.compatibility.CompatibilityPart.invalidate(CompatibilityPart.java:226) at org.eclipse.ui.internal.e4.compatibility.CompatibilityPart.destroy(CompatibilityPart.java:392) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:56) at org.eclipse.e4.core.internal.di.InjectorImpl.processAnnotated(InjectorImpl.java:877) at org.eclipse.e4.core.internal.di.InjectorImpl.processAnnotated(InjectorImpl.java:857) at org.eclipse.e4.core.internal.di.InjectorImpl.disposed(InjectorImpl.java:386) at org.eclipse.e4.core.internal.di.Requestor.disposed(Requestor.java:132) at org.eclipse.e4.core.internal.contexts.ContextObjectSupplier$ContextInjectionListener.update(ContextObjectSupplier.java:76) at org.eclipse.e4.core.internal.contexts.TrackableComputationExt.update(TrackableComputationExt.java:107) at org.eclipse.e4.core.internal.contexts.TrackableComputationExt.handleInvalid(TrackableComputationExt.java:70) at org.eclipse.e4.core.internal.contexts.EclipseContext.dispose(EclipseContext.java:171) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.clearContext(PartRenderingEngine.java:940) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeRemoveGui(PartRenderingEngine.java:920) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$3(PartRenderingEngine.java:828) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$8.run(PartRenderingEngine.java:823) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.removeGui(PartRenderingEngine.java:808) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$1.handleEvent(PartRenderingEngine.java:153) at org.eclipse.e4.ui.services.internal.events.UIEventHandler$1.run(UIEventHandler.java:41) at org.eclipse.swt.widgets.Synchronizer.syncExec(Synchronizer.java:180) at org.eclipse.ui.internal.UISynchronizer.syncExec(UISynchronizer.java:150) at org.eclipse.swt.widgets.Display.syncExec(Display.java:4688) at org.eclipse.e4.ui.internal.workbench.swt.E4Application$1.syncExec(E4Application.java:205) at org.eclipse.e4.ui.services.internal.events.UIEventHandler.handleEvent(UIEventHandler.java:38) at org.eclipse.equinox.internal.event.EventHandlerWrapper.handleEvent(EventHandlerWrapper.java:197) at org.eclipse.equinox.internal.event.EventHandlerTracker.dispatchEvent(EventHandlerTracker.java:197) at org.eclipse.equinox.internal.event.EventHandlerTracker.dispatchEvent(EventHandlerTracker.java:1) at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230) at org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:148) at org.eclipse.equinox.internal.event.EventAdminImpl.dispatchEvent(EventAdminImpl.java:135) at org.eclipse.equinox.internal.event.EventAdminImpl.sendEvent(EventAdminImpl.java:78) at org.eclipse.equinox.internal.event.EventComponent.sendEvent(EventComponent.java:39) at org.eclipse.e4.ui.services.internal.events.EventBroker.send(EventBroker.java:80) at org.eclipse.e4.ui.internal.workbench.UIEventPublisher.notifyChanged(UIEventPublisher.java:58) at org.eclipse.emf.common.notify.impl.BasicNotifierImpl.eNotify(BasicNotifierImpl.java:374) at org.eclipse.e4.ui.model.application.ui.impl.UIElementImpl.setToBeRendered(UIElementImpl.java:290) at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.hidePart(PartServiceImpl.java:1166) at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.hidePart(PartServiceImpl.java:1101) at org.eclipse.e4.ui.workbench.renderers.swt.StackRenderer.closePart(StackRenderer.java:1069) at org.eclipse.e4.ui.workbench.renderers.swt.StackRenderer.access$5(StackRenderer.java:1051) at org.eclipse.e4.ui.workbench.renderers.swt.StackRenderer$11.close(StackRenderer.java:945) at org.eclipse.swt.custom.CTabFolder.onMouse(CTabFolder.java:1852) at org.eclipse.swt.custom.CTabFolder$1.handleEvent(CTabFolder.java:284) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1057) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4170) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3759) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1113) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:997) at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:138) at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:610) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:567) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:124) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:354) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:181) 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:606) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:636) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:591) at org.eclipse.equinox.launcher.Main.run(Main.java:1450) at org.eclipse.equinox.launcher.Main.main(Main.java:1426) session data eclipse.buildId=3.5.0.201312060013-M1-e43 java.version=1.7.0_25 java.vendor=Oracle Corporation BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=en_US Framework arguments: -product org.springsource.sts.ide Command-line arguments: -os win32 -ws win32 -arch x86_64 -product org.springsource.sts.ide