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java.lang.NullPointerException: 	at org.eclipse.jdt.internal.ui.text.JavaReconciler.uninstall(JavaReconciler.java:341)	at org.eclipse.jface.text.source.SourceViewer.unconfigure(SourceViewer.java:698)	at org.eclipse.jdt.internal.ui.javaeditor.JavaSourceViewer.unconfigure(JavaSourceViewer.java:357)	at org.eclipse.jface.text.source.SourceViewer.handleDispose(SourceViewer.java:751)	at org.eclipse.jface.text.source.projection.ProjectionViewer.handleDispose(ProjectionViewer.java:1363)	at org.eclipse.jdt.internal.ui.javaeditor.JavaSourceViewer.handleDispose(JavaSourceViewer.java:462)	at org.eclipse.jface.text.TextViewer$2.widgetDisposed(TextViewer.java:1798)	at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:123)	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.Widget.sendEvent(Widget.java:1282)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1267)	at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1061)	at org.eclipse.swt.custom.StyledText.handleDispose(StyledText.java:5829)	at org.eclipse.swt.custom.StyledText$7.handleEvent(StyledText.java:5655)	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.Widget.sendEvent(Widget.java:1282)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1263)	at org.eclipse.swt.widgets.Widget.release(Widget.java:1080)	at org.eclipse.swt.widgets.Control.release(Control.java:3304)	at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:1293)	at org.eclipse.swt.widgets.Canvas.releaseChildren(Canvas.java:208)	at org.eclipse.swt.widgets.Widget.release(Widget.java:1083)	at org.eclipse.swt.widgets.Control.release(Control.java:3304)	at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:1293)	at org.eclipse.swt.widgets.Widget.release(Widget.java:1083)	at org.eclipse.swt.widgets.Control.release(Control.java:3304)	at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:1293)	at org.eclipse.swt.widgets.Widget.release(Widget.java:1083)	at org.eclipse.swt.widgets.Control.release(Control.java:3304)	at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:1293)	at org.eclipse.swt.widgets.Widget.release(Widget.java:1083)	at org.eclipse.swt.widgets.Control.release(Control.java:3304)	at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:1293)	at org.eclipse.swt.widgets.Widget.release(Widget.java:1083)	at org.eclipse.swt.widgets.Control.release(Control.java:3304)	at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:1293)	at org.eclipse.swt.widgets.Widget.release(Widget.java:1083)	at org.eclipse.swt.widgets.Control.release(Control.java:3304)	at org.eclipse.swt.widgets.Composite.releaseChildren(Composite.java:1293)	at org.eclipse.swt.widgets.Widget.release(Widget.java:1083)	at org.eclipse.swt.widgets.Control.release(Control.java:3304)	at org.eclipse.swt.widgets.Widget.dispose(Widget.java:462)	at org.eclipse.ui.internal.PartPane.dispose(PartPane.java:180)	at org.eclipse.ui.internal.WorkbenchPartReference.dispose(WorkbenchPartReference.java:681)	at org.eclipse.ui.internal.WorkbenchPage.disposePart(WorkbenchPage.java:1721)	at org.eclipse.ui.internal.WorkbenchPage.handleDeferredEvents(WorkbenchPage.java:1426)	at org.eclipse.ui.internal.WorkbenchPage.deferUpdates(WorkbenchPage.java:1410)	at org.eclipse.ui.internal.WorkbenchPage.closeEditors(WorkbenchPage.java:1384)	at org.eclipse.ui.internal.WorkbenchPage.closeAllEditors(WorkbenchPage.java:1188)	at org.eclipse.ui.internal.WorkbenchPage.dispose(WorkbenchPage.java:1770)	at org.eclipse.ui.internal.WorkbenchWindow.closeAllPages(WorkbenchWindow.java:867)	at org.eclipse.ui.internal.WorkbenchWindow.hardClose(WorkbenchWindow.java:1702)	at org.eclipse.ui.internal.WorkbenchWindow.busyClose(WorkbenchWindow.java:734)	at org.eclipse.ui.internal.WorkbenchWindow.access$0(WorkbenchWindow.java:710)	at org.eclipse.ui.internal.WorkbenchWindow$5.run(WorkbenchWindow.java:832)	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)	at org.eclipse.ui.internal.WorkbenchWindow.close(WorkbenchWindow.java:830)	at org.eclipse.jface.window.WindowManager.close(WindowManager.java:109)	at org.eclipse.ui.internal.Workbench$18.run(Workbench.java:1106)	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)	at org.eclipse.ui.internal.Workbench.busyClose(Workbench.java:1103)	at org.eclipse.ui.internal.Workbench.access$15(Workbench.java:1032)	at org.eclipse.ui.internal.Workbench$25.run(Workbench.java:1276)	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)	at org.eclipse.ui.internal.Workbench.close(Workbench.java:1274)	at org.eclipse.ui.internal.Workbench.close(Workbench.java:1246)	at org.eclipse.ui.internal.WorkbenchWindow.busyClose(WorkbenchWindow.java:731)	at org.eclipse.ui.internal.WorkbenchWindow.access$0(WorkbenchWindow.java:710)	at org.eclipse.ui.internal.WorkbenchWindow$5.run(WorkbenchWindow.java:832)	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)	at org.eclipse.ui.internal.WorkbenchWindow.close(WorkbenchWindow.java:830)	at org.eclipse.jface.window.Window.handleShellCloseEvent(Window.java:741)	at org.eclipse.jface.window.Window$3.shellClosed(Window.java:687)	at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:98)	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.Widget.sendEvent(Widget.java:1282)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1267)	at org.eclipse.swt.widgets.Shell.closeWidget(Shell.java:616)	at org.eclipse.swt.widgets.Shell.gtk_delete_event(Shell.java:1166)	at org.eclipse.swt.widgets.Widget.windowProc(Widget.java:1735)	at org.eclipse.swt.widgets.Control.windowProc(Control.java:4796)	at org.eclipse.swt.widgets.Display.windowProc(Display.java:4360)	at org.eclipse.swt.internal.gtk.OS._gtk_main_do_event(Native Method)	at org.eclipse.swt.internal.gtk.OS.gtk_main_do_event(OS.java:8189)	at org.eclipse.swt.widgets.Display.eventProc(Display.java:1238)	at org.eclipse.swt.internal.gtk.OS._g_main_context_iteration(Native Method)	at org.eclipse.swt.internal.gtk.OS.g_main_context_iteration(OS.java:2237)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3159)	at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2640)	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2604)	at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2438)	at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:671)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:664)	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:115)	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:369)	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:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:616)	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:620)	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:575)	at org.eclipse.equinox.launcher.Main.run(Main.java:1408)	at org.eclipse.equinox.launcher.Main.main(Main.java:1384)