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java.lang.NullPointerException: 	at org.eclipse.wst.server.ui.internal.editor.GlobalCommandManager.getTimestamp(GlobalCommandManager.java:717)	at org.eclipse.wst.server.ui.internal.editor.GlobalCommandManager.updateTimestamps(GlobalCommandManager.java:713)	at org.eclipse.wst.server.ui.internal.editor.ServerEditor.checkResourceState(ServerEditor.java:991)	at org.eclipse.wst.server.ui.internal.editor.ServerEditor$ActivationListener.handleActivation(ServerEditor.java:82)	at org.eclipse.wst.server.ui.internal.editor.ServerEditor$ActivationListener.partActivated(ServerEditor.java:52)	at org.eclipse.ui.internal.PartService$1.run(PartService.java:84)	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)	at org.eclipse.ui.internal.PartService.partActivated(PartService.java:81)	at org.eclipse.ui.internal.WorkbenchWindow$WWinPartService.partActivated(WorkbenchWindow.java:3100)	at org.eclipse.ui.internal.WorkbenchPage$14.run(WorkbenchPage.java:4912)	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)	at org.eclipse.ui.internal.WorkbenchPage.firePartActivated(WorkbenchPage.java:4909)	at org.eclipse.ui.internal.WorkbenchPage.access$19(WorkbenchPage.java:4897)	at org.eclipse.ui.internal.WorkbenchPage$E4PartListener.partActivated(WorkbenchPage.java:203)	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl$3.run(PartServiceImpl.java:245)	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.firePartActivated(PartServiceImpl.java:242)	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.activate(PartServiceImpl.java:711)	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.activate(PartServiceImpl.java:639)	at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.activate(PartServiceImpl.java:634)	at org.eclipse.ui.internal.WorkbenchPage.activate(WorkbenchPage.java:980)	at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:3213)	at org.eclipse.ui.internal.WorkbenchPage.access$25(WorkbenchPage.java:3167)	at org.eclipse.ui.internal.WorkbenchPage$10.run(WorkbenchPage.java:3149)	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:3144)	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:3108)	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:3089)	at org.eclipse.wst.server.ui.internal.ServerUIPlugin.editServer(ServerUIPlugin.java:443)	at org.eclipse.wst.server.ui.internal.ServerUIPlugin.editServer(ServerUIPlugin.java:426)	at org.eclipse.wst.server.ui.internal.view.servers.OpenAction.perform(OpenAction.java:36)	at org.eclipse.wst.server.ui.internal.view.servers.AbstractServerAction.run(AbstractServerAction.java:64)	at org.eclipse.jface.action.Action.runWithEvent(Action.java:473)	at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:595)	at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:511)	at org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:420)	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4230)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1491)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1514)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1499)	at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1299)	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4072)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3698)	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$4.run(PartRenderingEngine.java:1127)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:337)	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1018)	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:156)	at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:694)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:337)	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:606)	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150)	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:139)	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:380)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:235)	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:669)	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:608)	at org.eclipse.equinox.launcher.Main.run(Main.java:1515)	at org.eclipse.equinox.launcher.Main.main(Main.java:1488)