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java.lang.NullPointerException: 	at com.springsource.sts.config.ui.editors.AbstractConfigEditor.dispose(AbstractConfigEditor.java:344)	at com.springsource.sts.config.ui.editors.SpringConfigEditor.dispose(SpringConfigEditor.java:119)	at org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:705)	at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:465)	at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:595)	at org.eclipse.ui.internal.EditorReference.getEditor(EditorReference.java:289)	at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditorBatched(WorkbenchPage.java:2945)	at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2850)	at org.eclipse.ui.internal.WorkbenchPage.access$11(WorkbenchPage.java:2842)	at org.eclipse.ui.internal.WorkbenchPage$10.run(WorkbenchPage.java:2793)	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2789)	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2773)	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2764)	at org.eclipse.egit.ui.internal.EgitUiEditorUtils.openEditor(EgitUiEditorUtils.java:114)	at org.eclipse.egit.ui.internal.EgitUiEditorUtils.openEditor(EgitUiEditorUtils.java:100)	at org.eclipse.egit.ui.internal.EgitUiEditorUtils.openEditor(EgitUiEditorUtils.java:66)	at org.eclipse.egit.ui.internal.history.command.ShowVersionsHandler.execute(ShowVersionsHandler.java:94)	at org.eclipse.ui.internal.handlers.HandlerProxy.execute(HandlerProxy.java:293)	at org.eclipse.core.commands.Command.executeWithChecks(Command.java:476)	at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:508)	at org.eclipse.ui.internal.handlers.HandlerService.executeCommandInContext(HandlerService.java:270)	at org.eclipse.ui.internal.handlers.SlaveHandlerService.executeCommandInContext(SlaveHandlerService.java:285)	at org.eclipse.ui.internal.handlers.SlaveHandlerService.executeCommandInContext(SlaveHandlerService.java:285)	at org.eclipse.ui.internal.handlers.SlaveHandlerService.executeCommandInContext(SlaveHandlerService.java:285)	at org.eclipse.egit.ui.internal.history.CommitGraphTable$8.open(CommitGraphTable.java:334)	at org.eclipse.jface.viewers.StructuredViewer$2.run(StructuredViewer.java:866)	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)	at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:49)	at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175)	at org.eclipse.jface.viewers.StructuredViewer.fireOpen(StructuredViewer.java:864)	at org.eclipse.jface.viewers.StructuredViewer.handleOpen(StructuredViewer.java:1152)	at org.eclipse.jface.viewers.StructuredViewer$6.handleOpen(StructuredViewer.java:1256)	at org.eclipse.jface.util.OpenStrategy.fireOpenEvent(OpenStrategy.java:275)	at org.eclipse.jface.util.OpenStrategy.access$2(OpenStrategy.java:269)	at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:309)	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1258)	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3588)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3209)	at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2701)	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2665)	at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2499)	at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:679)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:668)	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:123)	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:344)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:622)	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)	at org.eclipse.equinox.launcher.Main.run(Main.java:1410)	at org.eclipse.equinox.launcher.Main.main(Main.java:1386)