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The following incident was reported via the automated error reporting: code: 0 plugin: org.eclipse.ui_3.107.0.v20150507-1945 message: HIDDEN fingerprint: 60175761 exception class: java.lang.NullPointerException exception message: HIDDEN number of children: 0 java.lang.NullPointerException: HIDDEN at org.eclipse.xtext.xbase.compiler.AbstractStringBuilderBasedAppendable.append(AbstractStringBuilderBasedAppendable.java:60) at org.eclipse.xtext.xbase.compiler.AbstractStringBuilderBasedAppendable.append(AbstractStringBuilderBasedAppendable.java:1) at org.eclipse.xtend.ide.refactoring.ExtractMethodRefactoring.appendMethodSignature(ExtractMethodRefactoring.java:307) at org.eclipse.xtend.ide.refactoring.ExtractMethodRefactoring.getMethodSignature(ExtractMethodRefactoring.java:279) at org.eclipse.xtend.ide.refactoring.ExtractMethodUserInputPage.updatePreview(ExtractMethodUserInputPage.java:249) at org.eclipse.xtend.ide.refactoring.ExtractMethodUserInputPage$4.widgetSelected(ExtractMethodUserInputPage.java:173) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:248) 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.jface.window.Window.runEventLoop(Window.java:827) at org.eclipse.jface.window.Window.open(Window.java:803) at org.eclipse.xtext.ui.refactoring.ui.RefactoringWizardOpenOperation_NonForking$1.run(RefactoringWizardOpenOperation_NonForking.java:112) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70) at org.eclipse.xtext.ui.refactoring.ui.RefactoringWizardOpenOperation_NonForking.run(RefactoringWizardOpenOperation_NonForking.java:126) at org.eclipse.xtext.ui.refactoring.ui.RefactoringWizardOpenOperation_NonForking.run(RefactoringWizardOpenOperation_NonForking.java:71) at org.eclipse.xtend.ide.refactoring.ExtractMethodHandler.execute(ExtractMethodHandler.java:81) at org.eclipse.ui.internal.handlers.HandlerProxy.execute(HandlerProxy.java:295) at org.eclipse.ui.internal.handlers.E4HandlerProxy.execute(E4HandlerProxy.java:90) at sun.reflect.GeneratedMethodAccessor147.invoke(null:-1) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:483) at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:56) at org.eclipse.e4.core.internal.di.InjectorImpl.invokeUsingClass(InjectorImpl.java:252) at org.eclipse.e4.core.internal.di.InjectorImpl.invoke(InjectorImpl.java:234) at org.eclipse.e4.core.contexts.ContextInjectionFactory.invoke(ContextInjectionFactory.java:132) at org.eclipse.e4.core.commands.internal.HandlerServiceHandler.execute(HandlerServiceHandler.java:152) at org.eclipse.core.commands.Command.executeWithChecks(Command.java:493) at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:486) at org.eclipse.e4.core.commands.internal.HandlerServiceImpl.executeHandler(HandlerServiceImpl.java:210) at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem.executeItem(HandledContributionItem.java:799) at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem.handleWidgetSelection(HandledContributionItem.java:675) at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem.access$7(HandledContributionItem.java:659) at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem$4.handleEvent(HandledContributionItem.java:592) 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:654) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:337) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:598) 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(NativeMethodAccessorImpl.java:-2) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:483) 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) General Information: reported-by: anonymous-id: 879f772e-6211-4311-aa5d-5157af0a73eb eclipse-build-id: 4.5.0.I20150603-2000 eclipse-product: org.eclipse.epp.package.committers.product operating system: MacOSX 10.10.5 (x86_64) - cocoa jre-version: 1.8.0_31-b13 The following plug-ins were present on the execution stack (*): 1. org.eclipse.core.commands_3.7.0.v20150422-0725 2. org.eclipse.core.databinding.observable_1.5.0.v20150422-0725 3. org.eclipse.core.databinding_1.5.0.v20150422-0725 4. org.eclipse.core.runtime_3.11.0.v20150405-1723 5. org.eclipse.e4.core.commands_0.11.0.v20150422-0725 6. org.eclipse.e4.core.contexts_1.4.0.v20150421-2214 7. org.eclipse.e4.core.di_1.5.0.v20150421-2214 8. org.eclipse.e4.ui.workbench_1.3.0.v20150531-1948 9. org.eclipse.e4.ui.workbench.renderers.swt_0.13.0.v20150603-0857 10. org.eclipse.e4.ui.workbench.swt_0.13.0.v20150504-0621 11. org.eclipse.equinox.app_1.3.300.v20150423-1356 12. org.eclipse.equinox.launcher_1.3.100.v20150511-1540 13. org.eclipse.jface_3.11.0.v20150602-1400 14. org.eclipse.swt_3.104.0.v20150528-0211 15. org.eclipse.ui_3.107.0.v20150507-1945 16. org.eclipse.ui.ide.application_1.1.0.v20150422-0725 17. org.eclipse.ui.ide_3.11.0.v20150510-1749 18. org.eclipse.xtend.ide_2.8.4.v201508050135 19. org.eclipse.xtend_2.1.0.v201505260349 20. org.eclipse.xtext.ui_2.8.4.v201508050135 21. org.eclipse.xtext_2.8.4.v201508050135 22. org.eclipse.xtext.xbase_2.8.4.v201508050135 Please note that: * Messages, stacktraces, and nested status objects may be shortened. * Bug fields like status, resolution, and whiteboard are sent back to reporters. * The list of present bundles and their respective versions was calculated by package naming heuristics. This may or may not reflect reality. Other Resources: * Report: https://dev.eclipse.org/recommenders/committers/confess/#/problems/560953d0e4b000b0bdbc1682 * Manual: https://dev.eclipse.org/recommenders/community/confess/#/guide Thank you for your assistance. Your friendly error-reports-inbox. This bug was created on behalf of sebastian.zarnekow@xxxxxxxxxxxx.
The exception occurs during an Extract Method refactoring. The exception can only occur when a null typeRef is passed into the append method. From ExtractMethodRefactoring#307 can be seen that it should be the return type. I think this could only happen when the actual return type is not known or not resolvable. However, I tried to use the Extract Method refactoring with different "broken" scenarios. In all cases the return type was an UnknownTypeReference and thus "Object" was appended. Therefore I consider this bug as working with the current state of Xtext.
