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Bug 367397

Summary:	InvocationTargetException on Content Assist
Product:	[Modeling] TMF	Reporter:	Fabio Filippelli <fabio.filippelli>
Component:	Xtext	Assignee:	Project Inbox <tmf.xtext-inbox>
Status:	NEW ---	QA Contact:
Severity:	normal
Priority:	P3	CC:	fabio.filippelli
Version:	2.2.1
Target Milestone:	---
Hardware:	PC
OS:	Windows 7
Whiteboard:

Description Fabio Filippelli

2011-12-22 03:57:13 EST

Build Identifier: Xtext 2.2.1 - Eclipse Indigo (20110916-0149)

We have created following Xtext grammar: 
http://teamprojekt-msi.googlecode.com/svn/trunk/spray-extensions/shapes/org.eclipselabs.spray.shapes/src/org/eclipselabs/spray/shapes/Shape.xtext. 

The code highlighting and all editor functionalities are working well in the Eclipse Application Runtime that for the DSL. 
Just the Code Completion is not working on some context. 

There we get a exception message:
!ENTRY org.eclipse.ui 4 0 2011-12-22 09:47:38.830
!MESSAGE java.lang.reflect.InvocationTargetException
!STACK 0
java.lang.RuntimeException: java.lang.reflect.InvocationTargetException at org.eclipse.xtext.ui.editor.contentassist.antlr.AbstractContentAssistParser.getFollowElements(AbstractContentAssistParser.java:237)
	at org.eclipse.xtext.ui.editor.contentassist.antlr.AbstractContentAssistParser.getFollowElements(AbstractContentAssistParser.java:141)
	at org.eclipse.xtext.ui.editor.contentassist.antlr.ParserBasedContentAssistContextFactory$StatefulFactory.computeFollowElements(ParserBasedContentAssistContextFactory.java:387)
	at org.eclipse.xtext.ui.editor.contentassist.antlr.ParserBasedContentAssistContextFactory$StatefulFactory.computeFollowElements(ParserBasedContentAssistContextFactory.java:343)
	at org.eclipse.xtext.ui.editor.contentassist.antlr.ParserBasedContentAssistContextFactory$StatefulFactory.computeFollowElements(ParserBasedContentAssistContextFactory.java:337)
	at org.eclipse.xtext.ui.editor.contentassist.antlr.ParserBasedContentAssistContextFactory$StatefulFactory.doCreateContexts(ParserBasedContentAssistContextFactory.java:286)
	at org.eclipse.xtext.ui.editor.contentassist.antlr.ParserBasedContentAssistContextFactory$StatefulFactory.handleLastCompleteNodeIsAtEndOfDatatypeNode(ParserBasedContentAssistContextFactory.java:212)
	at org.eclipse.xtext.ui.editor.contentassist.antlr.ParserBasedContentAssistContextFactory$StatefulFactory.doCreateContexts(ParserBasedContentAssistContextFactory.java:161)
	at org.eclipse.xtext.ui.editor.contentassist.antlr.ParserBasedContentAssistContextFactory$StatefulFactory.create(ParserBasedContentAssistContextFactory.java:148)
	at org.eclipse.xtext.ui.editor.contentassist.antlr.ParserBasedContentAssistContextFactory.create(ParserBasedContentAssistContextFactory.java:549)
	at org.eclipse.xtext.ui.editor.contentassist.CompletionProposalComputer.exec(CompletionProposalComputer.java:48)
	at org.eclipse.xtext.ui.editor.contentassist.CompletionProposalComputer.exec(CompletionProposalComputer.java:1)
	at org.eclipse.xtext.util.concurrent.AbstractReadWriteAcces.readOnly(AbstractReadWriteAcces.java:32)
	at org.eclipse.xtext.ui.editor.model.XtextDocument.readOnly(XtextDocument.java:78)
	at org.eclipse.xtext.ui.editor.contentassist.XtextContentAssistProcessor.computeCompletionProposals(XtextContentAssistProcessor.java:69)
	at org.eclipse.xtext.ui.editor.contentassist.RepeatedContentAssistProcessor.computeCompletionProposals(RepeatedContentAssistProcessor.java:73)
	at org.eclipse.jface.text.contentassist.ContentAssistant.computeCompletionProposals(ContentAssistant.java:1830)
	at org.eclipse.jface.text.contentassist.CompletionProposalPopup.computeProposals(CompletionProposalPopup.java:556)
	at org.eclipse.jface.text.contentassist.CompletionProposalPopup.access$16(CompletionProposalPopup.java:553)
	at org.eclipse.jface.text.contentassist.CompletionProposalPopup$2.run(CompletionProposalPopup.java:488)
	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
	at org.eclipse.jface.text.contentassist.CompletionProposalPopup.showProposals(CompletionProposalPopup.java:482)
	at org.eclipse.jface.text.contentassist.ContentAssistant.showPossibleCompletions(ContentAssistant.java:1656)
	at org.eclipse.jface.text.source.SourceViewer.doOperation(SourceViewer.java:930)
	at org.eclipse.jface.text.source.projection.ProjectionViewer.doOperation(ProjectionViewer.java:1534)
	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: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:468)
	at org.eclipse.ui.internal.keys.WorkbenchKeyboard.press(WorkbenchKeyboard.java:786)
	at org.eclipse.ui.internal.keys.WorkbenchKeyboard.processKeyEvent(WorkbenchKeyboard.java:885)
	at org.eclipse.ui.internal.keys.WorkbenchKeyboard.filterKeySequenceBindings(WorkbenchKeyboard.java:567)
	at org.eclipse.ui.internal.keys.WorkbenchKeyboard.access$3(WorkbenchKeyboard.java:508)
	at org.eclipse.ui.internal.keys.WorkbenchKeyboard$KeyDownFilter.handleEvent(WorkbenchKeyboard.java:123)
	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:1052)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1077)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1062)
	at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1104)
	at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1100)
	at org.eclipse.swt.widgets.Widget.wmChar(Widget.java:1509)
	at org.eclipse.swt.widgets.Control.WM_CHAR(Control.java:4640)
	at org.eclipse.swt.widgets.Canvas.WM_CHAR(Canvas.java:345)
	at org.eclipse.swt.widgets.Control.windowProc(Control.java:4528)
	at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:341)
	at org.eclipse.swt.widgets.Display.windowProc(Display.java:4972)
	at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method)
	at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:2531)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3752)
	at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2696)
	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2660)
	at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2494)
	at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:674)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:667)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:123)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:344)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:622)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1410)
	at org.eclipse.equinox.launcher.Main.main(Main.java:1386)
Caused by: java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.eclipse.xtext.ui.editor.contentassist.antlr.AbstractContentAssistParser.getFollowElements(AbstractContentAssistParser.java:210)
	... 76 more
Caused by: java.lang.IllegalStateException
	at org.eclipse.xtext.parser.antlr.UnorderedGroupHelper$State.canLeave(UnorderedGroupHelper.java:228)
	at org.eclipse.xtext.parser.antlr.UnorderedGroupHelper.canLeave(UnorderedGroupHelper.java:146)
	at org.eclipse.xtext.ui.editor.contentassist.antlr.AbstractContentAssistParser$2.canLeave(AbstractContentAssistParser.java:132)
	at org.eclipse.xtext.ui.editor.contentassist.antlr.AbstractContentAssistParser$3.announceEof(AbstractContentAssistParser.java:170)
	at org.eclipse.xtext.ui.editor.contentassist.antlr.ObservableXtextTokenStream.LA(ObservableXtextTokenStream.java:48)
	at org.eclipselabs.spray.shapes.ui.contentassist.antlr.internal.InternalShapeParser.synpred184_InternalShape_fragment(InternalShapeParser.java:11335)
	at org.eclipselabs.spray.shapes.ui.contentassist.antlr.internal.InternalShapeParser.synpred184_InternalShape(InternalShapeParser.java:12880)
	at org.eclipselabs.spray.shapes.ui.contentassist.antlr.internal.InternalShapeParser$DFA134.specialStateTransition(InternalShapeParser.java:15609)
	at org.antlr.runtime.DFA.predict(DFA.java:80)
	at org.eclipse.xtext.ui.editor.contentassist.antlr.internal.DFA.predict(DFA.java:25)
	at org.eclipselabs.spray.shapes.ui.contentassist.antlr.internal.InternalShapeParser.rule__PolyLineLayout__UnorderedGroup_1__Impl(InternalShapeParser.java:64633)
	at org.eclipselabs.spray.shapes.ui.contentassist.antlr.internal.InternalShapeParser.rule__PolyLineLayout__UnorderedGroup_1__0(InternalShapeParser.java:64851)
	at org.eclipselabs.spray.shapes.ui.contentassist.antlr.internal.InternalShapeParser.rule__PolyLineLayout__UnorderedGroup_1(InternalShapeParser.java:64593)
	... 81 more


Reproducible: Always

Steps to Reproduce:
1. Create a new Xtext project (extension shape)
2. Use the grammar (with XBase Inheritance - comment StyleLayout
3. Run the MWE2 generator
4. Run an Eclipse Application for this grammar
5. Create a new Java Project and a new file with the extension "shape"
6. Put following conten in the file:
shape BPMN_Gateway_OR {
	polygon  {
		point(x=0,y=30)
		point(x=30,y=0)
		point(x=60,y=25)
		point(x=30,y=60)		
                // TRY CONTENT ASSIST HERE
		ellipse {
			position(x=15,y=15)
			size(width=30, height=30)
		}
	}
}
7. Try the content assist on the marked position.