Bug 49177 Quick Hierarchy gives NullPointerException [type hierarchy]
I200312182000 Reproduce: 1) Open JavaPreview.java 2) Goto line 83 3) Place cursor on 'preferenceStore' 4) Open quick hierarchy (ctrl-t) 5) check log: !ENTRY org.eclipse.ui 4 4 Dec 19, 2003 16:08:26.575 !MESSAGE Action for command 'org.eclipse.jdt.ui.edit.text.java.open.hierarchy' failed to execute properly. !ENTRY org.eclipse.ui 4 0 Dec 19, 2003 16:08:26.575 !MESSAGE Action for command 'org.eclipse.jdt.ui.edit.text.java.open.hierarchy' failed to execute properly. !STACK 0 java.lang.NullPointerException at org.eclipse.jdt.internal.ui.viewsupport.JavaElementLabels.getElementLabel(JavaElementLabels.java:305) at org.eclipse.jdt.internal.ui.viewsupport.JavaElementLabels.getElementLabel(JavaElementLabels.java:297) at org.eclipse.jdt.internal.ui.typehierarchy.HierarchyInformationControl.getHeaderLabel(HierarchyInformationControl.java:392) at org.eclipse.jdt.internal.ui.typehierarchy.HierarchyInformationControl.setInput(HierarchyInformationControl.java:322) at org.eclipse.jface.text.AbstractInformationControlManager.internalShowInformationControl(AbstractInformationControlManager.java:698) at org.eclipse.jface.text.AbstractInformationControlManager.presentInformation(AbstractInformationControlManager.java:677) at org.eclipse.jface.text.AbstractInformationControlManager.setInformation(AbstractInformationControlManager.java:240) at org.eclipse.jface.text.information.InformationPresenter.computeInformation(InformationPresenter.java:341) at org.eclipse.jface.text.AbstractInformationControlManager.doShowInformation(AbstractInformationControlManager.java:661) at org.eclipse.jface.text.AbstractInformationControlManager.showInformation(AbstractInformationControlManager.java:651) at org.eclipse.jdt.internal.ui.javaeditor.JavaSourceViewer.doOperation(JavaSourceViewer.java:120) at org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitEditor$AdaptedSourceViewer.doOperation(CompilationUnitEditor.java:187) at org.eclipse.ui.texteditor.TextOperationAction$1.run(TextOperationAction.java:122) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:84) at org.eclipse.ui.texteditor.TextOperationAction.run(TextOperationAction.java:120) at org.eclipse.jface.action.Action.runWithEvent(Action.java:842) at org.eclipse.ui.internal.commands.ActionHandler.execute(ActionHandler.java:40) at org.eclipse.ui.internal.keys.WorkbenchKeyboard.executeCommand(WorkbenchKeyboard.java:390) at org.eclipse.ui.internal.keys.WorkbenchKeyboard.press(WorkbenchKeyboard.java:763) at org.eclipse.ui.internal.keys.WorkbenchKeyboard.processKeyEvent(WorkbenchKeyboard.java:803) at org.eclipse.ui.internal.keys.WorkbenchKeyboard.filterKeySequenceBindings(WorkbenchKeyboard.java:486) at org.eclipse.ui.internal.keys.WorkbenchKeyboard.access$0(WorkbenchKeyboard.java:421) at org.eclipse.ui.internal.keys.WorkbenchKeyboard$1.handleEvent(WorkbenchKeyboard.java:215) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:82) at org.eclipse.swt.widgets.Display.filterEvent(Display.java:692) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:846) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:871) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:856) at org.eclipse.swt.widgets.Control.sendKeyEvent(Control.java:1716) at org.eclipse.swt.widgets.Control.sendKeyEvent(Control.java:1712) at org.eclipse.swt.widgets.Control.WM_CHAR(Control.java:3036) at org.eclipse.swt.widgets.Control.windowProc(Control.java:2939) at org.eclipse.swt.widgets.Display.windowProc(Display.java:2836) at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method) at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:1369) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:1990) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1506) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1482) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:246) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:139) at org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:47) at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:226) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:85) 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:279) at org.eclipse.core.launcher.Main.run(Main.java:742) at org.eclipse.core.launcher.Main.main(Main.java:581)
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/typehierarchy/HierarchyInformationControl.java
private KeySequence[] fKeySequences;
	public HierarchyInformationControl(Shell parent, int shellStyle, int treeStyle) {
		super(parent, shellStyle, treeStyle);
		fOtherExpandedElements= null;
		fKeySequences= null;
		fDoFilter= true;
	}
	
	private KeySequence[] getKeySequences() {
		if (fKeySequences == null) {
			ICommandManager commandManager = PlatformUI.getWorkbench().getCommandManager();
			ICommand command = commandManager.getCommand(IJavaEditorActionDefinitionIds.OPEN_HIERARCHY);
			if (command.isDefined()) {
				List list= command.getKeySequenceBindings();
				if (!list.isEmpty()) {
					fKeySequences= new KeySequence[list.size()];
					for (int i= 0; i < fKeySequences.length; i++) {
						fKeySequences[i]= ((IKeySequenceBinding) list.get(i)).getKeySequence();
					}
					return fKeySequences;
				}		
			}
			
			fKeySequences= new KeySequence[] { 
				KeySequence.getInstance(KeyStroke.getInstance(SpecialKey.F12))
			};
		}
		return fKeySequences;
	}