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Trying to code assist for the field "length" for a array I get: java.lang.NullPointerException at java.lang.String.<init>(String.java:244) at org.eclipse.jdt.internal.corext.util.TypeFilter.isFiltered(TypeFilter.java:44) at org.eclipse.jdt.internal.ui.text.java.ResultCollector.acceptField(ResultCollector.java:118) at org.eclipse.jdt.internal.codeassist.CompletionRequestorWrapper.accept(CompletionRequestorWrapper.java:118) at org.eclipse.jdt.internal.codeassist.CompletionEngine.findFieldsAndMethods(CompletionEngine.java:1659) at org.eclipse.jdt.internal.codeassist.CompletionEngine.complete(CompletionEngine.java:544) at org.eclipse.jdt.internal.codeassist.CompletionEngine.complete(CompletionEngine.java:1080) at org.eclipse.jdt.internal.core.Openable.codeComplete(Openable.java:118) at org.eclipse.jdt.internal.core.CompilationUnit.codeComplete(CompilationUnit.java:286) at org.eclipse.jdt.internal.core.CompilationUnit.codeComplete(CompilationUnit.java:201) at org.eclipse.jdt.internal.core.CompilationUnit.codeComplete(CompilationUnit.java:192) at org.eclipse.jdt.internal.ui.text.java.JavaCompletionProcessor.internalComputeCompletionProposals(JavaCompletionProcessor.java:358) at org.eclipse.jdt.internal.ui.text.java.JavaCompletionProcessor.computeCompletionProposals(JavaCompletionProcessor.java:332) at org.eclipse.jface.text.contentassist.ContentAssistant.computeCompletionProposals(ContentAssistant.java:1472) at org.eclipse.jface.text.contentassist.CompletionProposalPopup.computeProposals(CompletionProposalPopup.java:245) at org.eclipse.jface.text.contentassist.CompletionProposalPopup.access$7(CompletionProposalPopup.java:241) at org.eclipse.jface.text.contentassist.CompletionProposalPopup$1.run(CompletionProposalPopup.java:200) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:69) at org.eclipse.jface.text.contentassist.CompletionProposalPopup.showProposals(CompletionProposalPopup.java:195) at org.eclipse.jface.text.contentassist.ContentAssistant.showPossibleCompletions(ContentAssistant.java:1320) at org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitEditor$AdaptedSourceViewer.doOperation(CompilationUnitEditor.java:182) at org.eclipse.ui.texteditor.ContentAssistAction$1.run(ContentAssistAction.java:82) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:69) at org.eclipse.ui.texteditor.ContentAssistAction.run(ContentAssistAction.java:80) at org.eclipse.jface.action.Action.runWithEvent(Action.java:988) at org.eclipse.ui.commands.ActionHandler.execute(ActionHandler.java:188) at org.eclipse.ui.internal.commands.Command.execute(Command.java:130) at org.eclipse.ui.internal.keys.WorkbenchKeyboard.executeCommand(WorkbenchKeyboard.java:463) at org.eclipse.ui.internal.keys.WorkbenchKeyboard.press(WorkbenchKeyboard.java:956) at org.eclipse.ui.internal.keys.WorkbenchKeyboard.processKeyEvent(WorkbenchKeyboard.java:997) at org.eclipse.ui.internal.keys.WorkbenchKeyboard.filterKeySequenceBindings(WorkbenchKeyboard.java:541) at org.eclipse.ui.internal.keys.WorkbenchKeyboard.access$2(WorkbenchKeyboard.java:488) at org.eclipse.ui.internal.keys.WorkbenchKeyboard$1.handleEvent(WorkbenchKeyboard.java:241) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:82) at org.eclipse.swt.widgets.Display.filterEvent(Display.java:748) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:799) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:824) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:809) at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:837) at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:833) at org.eclipse.swt.widgets.Widget.wmChar(Widget.java:1096) at org.eclipse.swt.widgets.Control.WM_CHAR(Control.java:3066) at org.eclipse.swt.widgets.Control.windowProc(Control.java:2977) at org.eclipse.swt.widgets.Display.windowProc(Display.java:3351) at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method) at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:1489) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2441) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1443) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1414) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:271) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:144) at org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:102) at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:335) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:273) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:129) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:85) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:58) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:60) at java.lang.reflect.Method.invoke(Method.java:391) at org.eclipse.core.launcher.Main.basicRun(Main.java:185) at org.eclipse.core.launcher.Main.run(Main.java:684) at org.eclipse.core.launcher.Main.main(Main.java:668)
Here is a test case: public class X { public static void main(String[] args) { System.out.println(args.<COMPLETION HERE>); } } The problem is that CompletionProposal has no type package name and the requestor is not expecting the null case. I don't know if the null case should be handle. The API is not describing it. ICompletionRequestor#acceptField(...) doesn't say that some parameters can be null. If the null case is ok, then this is a bug in the client and this PR should be moved to JDT/UI. I set the severity to major since it is not possible to do any code assist for an array (length, clone(), ...).
Fixed. Parameters must not be null. The ComplectionRequestorWrapper must return empty array instead of null.
Verified for 3.1 M3 with build I200411040010 + jdt.core HEAD Note that this problem does not occur in M2...
