IndexOutOfBoundsException during code completion

I also see this (missing jar dependency?) when trying code completion:

!ENTRY org.eclipse.ui 4 0 2007-11-12 13:34:50.203
!MESSAGE Unhandled event loop exception
!STACK 0
java.lang.NoClassDefFoundError: org/jdom/Document
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2365)
at java.lang.Class.getDeclaredMethods(Class.java:1763)
at org.codehaus.groovy.eclipse.core.types.impl.ClassLoaderMemberLookup.collectAllMethods(ClassLoaderMemberLookup.java:91)
at org.codehaus.groovy.eclipse.core.types.impl.ClassLoaderMemberLookup.collectAllMethods(ClassLoaderMemberLookup.java:67)
at org.codehaus.groovy.eclipse.core.types.AbstractMemberLookup.collectAllProperties(AbstractMemberLookup.java:194)
at org.codehaus.groovy.eclipse.core.types.AbstractMemberLookup.lookupProperties(AbstractMemberLookup.java:39)
at org.codehaus.groovy.eclipse.core.types.impl.CompositeLookup.lookupProperties(CompositeLookup.java:54)
at org.codehaus.groovy.eclipse.codeassist.completion.CodeCompletionProcessor.createCompletionProposals(CodeCompletionProcessor.java:193)
at org.codehaus.groovy.eclipse.codeassist.completion.CodeCompletionProcessor.computeCompletionProposals(CodeCompletionProcessor.java:155)
at org.codehaus.groovy.eclipse.editor.contentAssist.ContentAssistProcessorSet.computeCompletionProposals(ContentAssistProcessorSet.java:63)
at org.eclipse.jface.text.contentassist.ContentAssistant.computeCompletionProposals(ContentAssistant.java:1759)
at org.eclipse.jface.text.contentassist.CompletionProposalPopup.computeProposals(CompletionProposalPopup.java:478)
at org.eclipse.jface.text.contentassist.CompletionProposalPopup.access$16(CompletionProposalPopup.java:475)
at org.eclipse.jface.text.contentassist.CompletionProposalPopup$2.run(CompletionProposalPopup.java:410)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:67)
at org.eclipse.jface.text.contentassist.CompletionProposalPopup.showProposals(CompletionProposalPopup.java:404)
at org.eclipse.jface.text.contentassist.ContentAssistant.showPossibleCompletions(ContentAssistant.java:1588)
at org.eclipse.jface.text.source.SourceViewer.doOperation(SourceViewer.java:773)
at org.eclipse.ui.texteditor.ContentAssistAction$1.run(ContentAssistAction.java:82)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:67)
at org.eclipse.ui.texteditor.ContentAssistAction.run(ContentAssistAction.java:80)
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:475)
at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:429)
at org.eclipse.ui.internal.handlers.HandlerService.executeCommand(HandlerService.java:165)
at org.eclipse.ui.internal.keys.WorkbenchKeyboard.executeCommand(WorkbenchKeyboard.java:470)
at org.eclipse.ui.internal.keys.WorkbenchKeyboard.press(WorkbenchKeyboard.java:821)
at org.eclipse.ui.internal.keys.WorkbenchKeyboard.processKeyEvent(WorkbenchKeyboard.java:879)
at org.eclipse.ui.internal.keys.WorkbenchKeyboard.filterKeySequenceBindings(WorkbenchKeyboard.java:568)
at org.eclipse.ui.internal.keys.WorkbenchKeyboard.access$3(WorkbenchKeyboard.java:510)
at org.eclipse.ui.internal.keys.WorkbenchKeyboard$KeyDownFilter.handleEvent(WorkbenchKeyboard.java:126)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
at org.eclipse.swt.widgets.Display.filterEvent(Display.java:1141)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:937)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:962)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:947)
at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:975)
at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:971)
at org.eclipse.swt.widgets.Widget.wmChar(Widget.java:1285)
at org.eclipse.swt.widgets.Control.WM_CHAR(Control.java:3772)
at org.eclipse.swt.widgets.Control.windowProc(Control.java:3672)
at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:291)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:4351)
at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method)
at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:2264)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3291)
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:153)
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:585)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:504)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:443)
at org.eclipse.equinox.launcher.Main.run(Main.java:1169)
at org.eclipse.equinox.launcher.Main.main(Main.java:1144)

I dropped jdom.jar into the lib dir for the plugin, and now I don't get the NoClassDefFoundError, but it still doesn't work.

Clark,
I am going to fix the problem that Michael described, but it is different from the one you are seeing. Can you open a separate issue for your problem?

Changed the DocumentReverseCharSequence to fix the off by one problem that occurs when using completion at the end of a document. In this scenario, when getting the rightExpression in the typedContentProcessor compute function (which is '.'), the start is the last char and the end is the last char. Later, when the regex matcher is run, it calls subsequence with 0,0 as start,end. The J2SE doc for CharSequence says that subSequence should return start to end-1, so the previous implementation was returning this.start-start, this.start-end+1 (think (-(end-1)). But, when start,end are 0,0, this is the last char for start and last char + 1 for end, so the xtor of the return sequence throws a StringOutOfBoundsException because end is equal to docLength().

It was also impossible to construct an empty DocumentCharSequence at the beginning of an empty document before, since start,end would have to be x,x-1 in order for the length to result in 0. And, the constructor threw an exception if the start or end is less than 0. This caused problems when code completing on an empty doc, e.g. type <ctrl space> in a new file at 0,0. The new implementation allows for constructing an empty sequence with start=x, length=0.

Finally I removed some unnecessary and some unused code in org.codehaus.groovy.eclipse.codeassist.hippie.GroovyContentAssistProcessor

I will wait for a build to be published before marking this as resolved.

Fix is committed and will be available in the next build