Got this when attempting to save a stratego file:

java.lang.NullPointerException
at org.strategoxt.imp.runtime.services.StrategoObserver.makeInputTerm(StrategoObserver.java:456)
at org.strategoxt.imp.runtime.services.StrategoObserver.makeInputTerm(StrategoObserver.java:446)
at org.strategoxt.imp.runtime.services.StrategoObserver.invokeSilent(StrategoObserver.java:569)
at org.strategoxt.imp.runtime.services.OnSaveService.documentChanged(OnSaveService.java:56)
at org.eclipse.imp.editor.UniversalEditor.doSave(UniversalEditor.java:1925)
at org.eclipse.ui.texteditor.AbstractTextEditor$TextEditorSavable.doSave(AbstractTextEditor.java:7066)
at org.eclipse.ui.Saveable.doSave(Saveable.java:214)
at org.eclipse.ui.internal.SaveableHelper.doSaveModel(SaveableHelper.java:346)
at org.eclipse.ui.internal.SaveableHelper$3.run(SaveableHelper.java:193)
at org.eclipse.ui.internal.SaveableHelper$5.run(SaveableHelper.java:274)
at org.eclipse.jface.operation.ModalContext.runInCurrentThread(ModalContext.java:464)
at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:372)
at org.eclipse.jface.window.ApplicationWindow$1.run(ApplicationWindow.java:759)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
at org.eclipse.jface.window.ApplicationWindow.run(ApplicationWindow.java:756)
at org.eclipse.ui.internal.WorkbenchWindow.run(WorkbenchWindow.java:2579)
at org.eclipse.ui.internal.SaveableHelper.runProgressMonitorOperation(SaveableHelper.java:282)
at org.eclipse.ui.internal.SaveableHelper.runProgressMonitorOperation(SaveableHelper.java:261)
at org.eclipse.ui.internal.SaveableHelper.saveModels(SaveableHelper.java:204)
at org.eclipse.ui.internal.SaveableHelper.savePart(SaveableHelper.java:144)
at org.eclipse.ui.internal.EditorManager.savePart(EditorManager.java:1357)
at org.eclipse.ui.internal.WorkbenchPage.savePart(WorkbenchPage.java:3328)
at org.eclipse.ui.internal.WorkbenchPage.saveEditor(WorkbenchPage.java:3341)
at org.eclipse.ui.internal.SaveAction.run(SaveAction.java:76)
at org.eclipse.jface.action.Action.runWithEvent(Action.java:498)
at org.eclipse.ui.commands.ActionHandler.execute(ActionHandler.java:185)
at org.eclipse.ui.internal.handlers.LegacyHandlerWrapper.execute(LegacyHandlerWrapper.java:109)
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.executeCommand(HandlerService.java:169)
at org.eclipse.ui.internal.keys.WorkbenchKeyboard.executeCommand(WorkbenchKeyboard.java:470)
at org.eclipse.ui.internal.keys.WorkbenchKeyboard.press(WorkbenchKeyboard.java:824)
at org.eclipse.ui.internal.keys.WorkbenchKeyboard.processKeyEvent(WorkbenchKeyboard.java:880)
at org.eclipse.ui.internal.keys.WorkbenchKeyboard.filterKeySequenceBindings(WorkbenchKeyboard.java:569)
at org.eclipse.ui.internal.keys.WorkbenchKeyboard.access$3(WorkbenchKeyboard.java:510)
at org.eclipse.ui.internal.keys.WorkbenchKeyboard$KeyDownFilter.handleEvent(WorkbenchKeyboard.java:125)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Display.filterEvent(Display.java:965)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:3542)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1250)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1273)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1258)
at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1287)
at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1283)
at org.eclipse.swt.widgets.Canvas.sendKeyEvent(Canvas.java:433)
at org.eclipse.swt.widgets.Control.doCommandBySelector(Control.java:906)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:4741)
at org.eclipse.swt.internal.cocoa.OS.objc_msgSend(Native Method)
at org.eclipse.swt.internal.cocoa.NSResponder.interpretKeyEvents(NSResponder.java:56)
at org.eclipse.swt.widgets.Composite.keyDown(Composite.java:516)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:4655)
at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method)
at org.eclipse.swt.widgets.Widget.callSuper(Widget.java:202)
at org.eclipse.swt.widgets.Widget.windowSendEvent(Widget.java:1753)
at org.eclipse.swt.widgets.Shell.windowSendEvent(Shell.java:1825)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:4713)
at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method)
at org.eclipse.swt.widgets.Display.applicationSendEvent(Display.java:4285)
at org.eclipse.swt.widgets.Display.applicationProc(Display.java:4352)
at org.eclipse.swt.internal.cocoa.OS.objc_msgSend(Native Method)
at org.eclipse.swt.internal.cocoa.NSApplication.sendEvent(NSApplication.java:101)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3097)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2405)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2369)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2221)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:500)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:493)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:113)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:194)
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:368)
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:559)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:514)
at org.eclipse.equinox.launcher.Main.run(Main.java:1311)

Submitted by Zef Hemel on 27 April 2010 at 10:43

Should be fixed in the next minor release.