Community
Participate
Working Groups
The following incident was reported via the automated error reporting: code: 1 plugin: org.eclipse.recommenders.subwords.rcp_2.1.13.v20150323-0859 message: Exception during code completion fingerprint: 258fe183 exception class: java.lang.NullPointerException exception message: - number of children: 0 java.lang.NullPointerException: null at org.eclipse.jdt.internal.codeassist.CompletionEngine.findLocalMethods(CompletionEngine.java:8737) at org.eclipse.jdt.internal.codeassist.CompletionEngine.findInterfacesMethods(CompletionEngine.java:8023) at org.eclipse.jdt.internal.codeassist.CompletionEngine.findMethods(CompletionEngine.java:10009) at org.eclipse.jdt.internal.codeassist.CompletionEngine.findVariablesAndMethods(CompletionEngine.java:11855) at org.eclipse.jdt.internal.codeassist.CompletionEngine.completionOnSingleNameReference(CompletionEngine.java:3295) at org.eclipse.jdt.internal.codeassist.CompletionEngine.complete(CompletionEngine.java:1713) at org.eclipse.jdt.internal.codeassist.CompletionEngine.complete(CompletionEngine.java:1939) at org.eclipse.jdt.internal.core.Openable.codeComplete(Openable.java:131) at org.eclipse.jdt.internal.core.CompilationUnit.codeComplete(CompilationUnit.java:357) at org.eclipse.jdt.internal.core.CompilationUnit.codeComplete(CompilationUnit.java:345) at org.eclipse.recommenders.internal.subwords.rcp.SubwordsSessionProcessor.computeProposals(SubwordsSessionProcessor.java:179) at org.eclipse.recommenders.internal.subwords.rcp.SubwordsSessionProcessor.getNewProposals(SubwordsSessionProcessor.java:151) at org.eclipse.recommenders.internal.subwords.rcp.SubwordsSessionProcessor.initializeContext(SubwordsSessionProcessor.java:108) at org.eclipse.recommenders.completion.rcp.processable.IntelligentCompletionProposalComputer.fireInitializeContext(IntelligentCompletionProposalComputer.java:218) at org.eclipse.recommenders.completion.rcp.processable.IntelligentCompletionProposalComputer.computeCompletionProposals(IntelligentCompletionProposalComputer.java:130) at org.eclipse.jdt.internal.ui.text.java.CompletionProposalComputerDescriptor.computeCompletionProposals(CompletionProposalComputerDescriptor.java:333) at org.eclipse.jdt.internal.ui.text.java.CompletionProposalCategory.computeCompletionProposals(CompletionProposalCategory.java:337) at org.eclipse.jdt.internal.ui.text.java.ContentAssistProcessor.collectProposals(ContentAssistProcessor.java:322) at org.eclipse.jdt.internal.ui.text.java.ContentAssistProcessor.computeCompletionProposals(ContentAssistProcessor.java:279) at org.eclipse.jface.text.contentassist.ContentAssistant$5.run(ContentAssistant.java:1904) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.jface.text.contentassist.ContentAssistant.computeCompletionProposals(ContentAssistant.java:1902) at org.eclipse.jface.text.contentassist.CompletionProposalPopup.computeProposals(CompletionProposalPopup.java:573) at org.eclipse.jface.text.contentassist.CompletionProposalPopup.access$16(CompletionProposalPopup.java:570) at org.eclipse.jface.text.contentassist.CompletionProposalPopup$2.run(CompletionProposalPopup.java:505) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70) at org.eclipse.jface.text.contentassist.CompletionProposalPopup.showProposals(CompletionProposalPopup.java:499) at org.eclipse.jface.text.contentassist.ContentAssistant.showPossibleCompletions(ContentAssistant.java:1720) at org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitEditor$AdaptedSourceViewer.doOperation(CompilationUnitEditor.java:180) at org.eclipse.ui.texteditor.ContentAssistAction$1.run(ContentAssistAction.java:82) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70) at org.eclipse.ui.texteditor.ContentAssistAction.run(ContentAssistAction.java:80) at org.eclipse.jface.action.Action.runWithEvent(Action.java:473) at org.eclipse.jface.commands.ActionHandler.execute(ActionHandler.java:122) at org.eclipse.ui.internal.handlers.E4HandlerProxy.execute(E4HandlerProxy.java:90) at sun.reflect.GeneratedMethodAccessor193.invoke(null:-1) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:55) at org.eclipse.e4.core.internal.di.InjectorImpl.invokeUsingClass(InjectorImpl.java:247) at org.eclipse.e4.core.internal.di.InjectorImpl.invoke(InjectorImpl.java:229) 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:499) at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:508) at org.eclipse.e4.core.commands.internal.HandlerServiceImpl.executeHandler(HandlerServiceImpl.java:210) at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.executeCommand(KeyBindingDispatcher.java:286) at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.press(KeyBindingDispatcher.java:507) at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.processKeyEvent(KeyBindingDispatcher.java:558) at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.filterKeySequenceBindings(KeyBindingDispatcher.java:378) at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.access$0(KeyBindingDispatcher.java:324) at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher$KeyDownFilter.handleEvent(KeyBindingDispatcher.java:86) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Display.filterEvent(Display.java:1262) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1060) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1085) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1070) at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1112) at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1108) at org.eclipse.swt.widgets.Widget.wmChar(Widget.java:1529) at org.eclipse.swt.widgets.Control.WM_CHAR(Control.java:4764) at org.eclipse.swt.widgets.Canvas.WM_CHAR(Canvas.java:343) at org.eclipse.swt.widgets.Control.windowProc(Control.java:4645) at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:339) at org.eclipse.swt.widgets.Display.windowProc(Display.java:5042) at org.eclipse.swt.internal.win32.OS.DispatchMessageW(OS.java:-2) at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:2549) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3759) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$4.run(PartRenderingEngine.java:1112) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:337) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:993) 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:138) 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:497) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:648) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:603) at org.eclipse.equinox.launcher.Main.run(Main.java:1465) General Information: reported-by: Lukas Eder anonymous-id: db231407-f5a0-4b36-b04d-38aa61d7e49a eclipse-build-id: 4.5.0.I20150320-0800 eclipse-product: org.eclipse.epp.package.java.product operating system: Windows8 6.2.0 (x86_64) - win32 jre-version: 1.8.0_40-b25 The following plug-ins were present on the execution stack (*): 1. org.eclipse.core.commands_3.6.100.v20150311-0214 2. org.eclipse.core.databinding.observable_1.4.1.v20150311-0218 3. org.eclipse.core.databinding_1.4.100.v20150311-0216 4. org.eclipse.core.runtime_3.11.0.v20150316-1241 5. org.eclipse.e4.core.commands_0.10.2.v20150313-1340 6. org.eclipse.e4.core.contexts_1.3.100.v20150316-1240 7. org.eclipse.e4.core.di_1.4.0.v20150316-1236 8. org.eclipse.e4.ui.bindings_0.10.200.v20150313-1340 9. org.eclipse.e4.ui.workbench_1.3.0.v20150316-1403 10. org.eclipse.e4.ui.workbench.swt_0.12.100.v20150316-1403 11. org.eclipse.equinox.app_1.3.200.v20130910-1609 12. org.eclipse.equinox.launcher_1.3.0.v20140415-2008 13. org.eclipse.jdt_3.11.0.v20150320-0800 14. org.eclipse.jdt.core_3.11.0.v20150317-0048 15. org.eclipse.jdt.ui_3.11.0.v20150316-2042 16. org.eclipse.jface_3.11.0.v20150313-1544 17. org.eclipse.jface.text_3.10.0.v20150112-1146 18. org.eclipse.recommenders.completion.rcp_2.1.13.v20150323-0859 19. org.eclipse.recommenders.subwords.rcp_2.1.13.v20150323-0859 20. org.eclipse.swt_3.104.0.v20150319-1901 21. org.eclipse.ui_3.107.0.v20150315-0703 22. org.eclipse.ui.ide.application_1.0.600.v20150315-1254 23. org.eclipse.ui.ide_3.11.0.v20150309-2044 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/55367429e4b026254ee05e03 * Manual: https://dev.eclipse.org/recommenders/community/confess/#/guide Thank you for your assistance. Your friendly error-reports-inbox.
Moving to JDT core for review.
(In reply to Marcel Bruch from comment #1) > Moving to JDT core for review. A code snippet reproducing the issue would be helpful
> A code snippet reproducing the issue would be helpful You folks implemented this popup that just uploads stack traces in Eclipse Mars M6. That's what you get. Stack traces with no code snippets :-) Anyway, I seem to be the one who caused this upload, and I'm pretty sure it has to do with something similar to the following: ---------------------------------------------------- public interface Test { @Annotation({X.AAAA, X.BBBB}) void method(); } @interface Annotation { X[] value() default {}; } enum X { AAAA, BBBB, CCCC, DDDD } ---------------------------------------------------- It then happened again, just now, when I was manipulating the list of values within the @Annotation({...}) usage: https://dev.eclipse.org/recommenders/community/confess/#/incidents/LUXIsOCXDVEItQnhe0VMKBdeqEi4sR7GHCa78p0k3yjINXgNj4t05OQfBYjGly5G Interesting thing: Up Eclipse Mars M5, I could autocomplete the following ---------------------------------------------------- public interface Test { @Annotation({AAAA/*auto-complete here to static-import*/, X.BBBB}) void method(); } ---------------------------------------------------- This seems to be no longer possible, there's a regression somewhere when autocompleting values passed to annotations.
Thanks Lukas. I investigated a bit and here's what is happening. When requesting for completion, we go about resolving the CU, in which both types Test and Annotation are declared. While resolving Test#method(), we see annotations and go about resolving the annotation (on the method). But in the process completion figures out that the node we are trying to solve is nothing but the node we are completing on and throws a CompletionNodeFound. This is fine, but as a result, the resolution of Test#method() is broken midway and we return from SourceTypeBinding#methods() without setting the returnType and this incomplete MethodBinding causes the NPE later.
Assist also doesn't work for the following case: public interface Test { @Annotation(AAAA|) void method(); } This is most likely because in findEnumConstantsFromExpectedTypes() we see the expected type as an array type (of X) and conclude that it is not enum and don't look for enum constants.
This bug hasn't had any activity in quite some time. Maybe the problem got resolved, was a duplicate of something else, or became less pressing for some reason - or maybe it's still relevant but just hasn't been looked at yet. If you have further information on the current state of the bug, please add it. The information can be, for example, that the problem still occurs, that you still want the feature, that more information is needed, or that the bug is (for whatever reason) no longer relevant. -- The automated Eclipse Genie.
