To recreate:

- Check out the QuickFix project from ajdt.test project
java.lang.NullPointerException- Open TestAspect.java in the Java Editor (right click > open with > Java 
Editor)
- Click on the lightbulb with the error marker (the same line as File f = new 
File("tmp");
java.lang.NullPointerException- An Internal Error appear in the Error log with the following stack trace:



java.lang.NullPointerException
at 
org.eclipse.jdt.internal.ui.text.correction.UnresolvedElementsSubProcessor.getT
ypeProposals(UnresolvedElementsSubProcessor.java:395)
at org.eclipse.jdt.internal.ui.text.correction.QuickFixProcessor.process
(QuickFixProcessor.java:270)
at org.eclipse.jdt.internal.ui.text.correction.QuickFixProcessor.getCorrections
(QuickFixProcessor.java:202)
at 
org.eclipse.jdt.internal.ui.text.correction.JavaCorrectionProcessor.collectCorr
ections(JavaCorrectionProcessor.java:240)
at 
org.eclipse.jdt.internal.ui.text.correction.JavaCorrectionProcessor.processAnno
tations(JavaCorrectionProcessor.java:208)
at 
org.eclipse.jdt.internal.ui.text.correction.JavaCorrectionProcessor.computeComp
letionProposals(JavaCorrectionProcessor.java:177)
at 
org.eclipse.jface.text.contentassist.ContentAssistant.computeCompletionProposal
s(ContentAssistant.java:1472)
at 
org.eclipse.jface.text.contentassist.CompletionProposalPopup.computeProposals
(CompletionProposalPopup.java:242)
at org.eclipse.jface.text.contentassist.CompletionProposalPopup.access$7
(CompletionProposalPopup.java:238)
at org.eclipse.jface.text.contentassist.CompletionProposalPopup$1.run
(CompletionProposalPopup.java:197)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:69)
at org.eclipse.jface.text.contentassist.CompletionProposalPopup.showProposals
(CompletionProposalPopup.java:192)
at 
org.eclipse.jface.text.contentassist.ContentAssistant.showPossibleCompletions
(ContentAssistant.java:1320)
at 
org.eclipse.jdt.internal.ui.text.correction.JavaCorrectionAssistant.showPossibl
eCompletions(JavaCorrectionAssistant.java:159)
at 
org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitEditor$AdaptedSourceViewe
r.doOperation(CompilationUnitEditor.java:184)
at org.eclipse.jdt.internal.ui.javaeditor.JavaSelectAnnotationRulerAction.run
(JavaSelectAnnotationRulerAction.java:78)
at org.eclipse.ui.texteditor.AbstractRulerActionDelegate.run
(AbstractRulerActionDelegate.java:99)
at org.eclipse.ui.internal.PluginAction.runWithEvent(PluginAction.java:276)
at org.eclipse.ui.internal.PluginAction.run(PluginAction.java:238)
at org.eclipse.ui.texteditor.AbstractTextEditor$11.triggerAction
(AbstractTextEditor.java:2110)
at org.eclipse.ui.texteditor.AbstractTextEditor$11.mouseUp
(AbstractTextEditor.java:2117)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:136)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:82)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:796)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:2772)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2431)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1377)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1348)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:254)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:141)
at org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:96)
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:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke
(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.eclipse.core.launcher.Main.basicRun(Main.java:183)
at org.eclipse.core.launcher.Main.run(Main.java:644)
at org.eclipse.core.launcher.Main.main(Main.java:628)


Looking at the jdt code in UnresolvedElementsSubProcessor.java, at line 395, 
the parent field is null:

	ASTNode parent= selectedNode.getParent();
	while (parent.getLength() == selectedNode.getLength()) { // line 395
			parent= parent.getParent(); 
	}

java.lang.NullPointerException There just needs to be a null check as there is above:


	ASTNode selectedNode= problem.getCoveringNode(context.getASTRoot());
	if (selectedNode == null) {
		return;
	}
	int kind= SimilarElementsRequestor.ALL_TYPES;
		
	ASTNode parent= selectedNode.getParent();
	while (parent.getLength() == selectedNode.getLength()) { 	
		parent= parent.getParent(); 
	}

should become:


	ASTNode selectedNode= problem.getCoveringNode(context.getASTRoot());
	if (selectedNode == null) {
		return;
	}
	int kind= SimilarElementsRequestor.ALL_TYPES;
		
	ASTNode parent= selectedNode.getParent();
	if (parent == null) {
		return;
	}
	while (parent.getLength() == selectedNode.getLength()) { 	
		parent= parent.getParent(); 
	}


This needs to be raised as a jdt bug, since we don't pass through any ajdt 
code in order to get here.

Raising this bug against ajdt is just for tracking.

(note this happens on 1.1.12, but also on the latest AJDT dev build).