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java.lang.NullPointerException: 	at org.eclipse.wst.sse.ui.StructuredTextEditor.update(StructuredTextEditor.java:3096)	at org.hibernate.eclipse.mapper.editors.xpl.XMLFormEditorPart.addSourcePage(XMLFormEditorPart.java:185)	at org.hibernate.eclipse.mapper.editors.xpl.XMLFormEditorPart.addPages(XMLFormEditorPart.java:50)	at org.hibernate.eclipse.mapper.editors.ReverseEngineeringEditor.addPages(ReverseEngineeringEditor.java:84)	at org.eclipse.ui.forms.editor.FormEditor.createPages(FormEditor.java:146)	at org.eclipse.ui.part.MultiPageEditorPart.createPartControl(MultiPageEditorPart.java:283)	at org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:661)	at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:426)	at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:592)	at org.eclipse.ui.internal.EditorReference.getEditor(EditorReference.java:263)	at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditorBatched(WorkbenchPage.java:2739)	at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2651)	at org.eclipse.ui.internal.WorkbenchPage.access$13(WorkbenchPage.java:2643)	at org.eclipse.ui.internal.WorkbenchPage$10.run(WorkbenchPage.java:2595)	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:67)	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2590)	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2574)	at org.eclipse.ui.actions.OpenWithMenu.openEditor(OpenWithMenu.java:340)	at org.eclipse.ui.actions.OpenWithMenu.access$0(OpenWithMenu.java:328)	at org.eclipse.ui.actions.OpenWithMenu$2.handleEvent(OpenWithMenu.java:190)	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:938)	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3682)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3293)	at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2389)	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2353)	at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2219)	at org.eclipse.ui.internal.Workbench$4.run(Workbench.java:466)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:289)	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:461)	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:106)	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:169)	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:106)	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:76)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:363)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:176)	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:508)	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:447)	at org.eclipse.equinox.launcher.Main.run(Main.java:1173)