Steps to reproduce:

• close the Project Archives view and restart Eclipse (obliged only if you have the Project Archives view open)
• open the Package Explorer view and right-click the contents of the view
  You will get the following exception:

java.lang.NullPointerException
at org.jboss.ide.eclipse.archives.ui.providers..menuAboutToShow2(ArchivesActionProvider.java:83)
at org.jboss.ide.eclipse.archives.ui.providers.ArchivesActionProvider.fillContextMenu(ArchivesActionProvider.java:79)
at org.eclipse.ui.navigator.NavigatorActionService.addCommonActionProviderMenu(NavigatorActionService.java:205)
at org.eclipse.ui.navigator.NavigatorActionService.fillContextMenu(NavigatorActionService.java:172)
at org.eclipse.ui.internal.navigator.CommonNavigatorManager.fillContextMenu(CommonNavigatorManager.java:258)
at org.eclipse.ui.internal.navigator.CommonNavigatorManager$4.menuAboutToShow(CommonNavigatorManager.java:273)
at org.eclipse.jface.action.MenuManager.fireAboutToShow(MenuManager.java:335)
at org.eclipse.jface.action.MenuManager.handleAboutToShow(MenuManager.java:463)
at org.eclipse.jface.action.MenuManager.access$1(MenuManager.java:459)
at org.eclipse.jface.action.MenuManager$2.menuShown(MenuManager.java:485)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:235)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1003)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1027)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1008)
at org.eclipse.swt.widgets.Control.WM_INITMENUPOPUP(Control.java:4111)
at org.eclipse.swt.widgets.Control.windowProc(Control.java:3815)
at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:337)
at org.eclipse.swt.widgets.Decorations.windowProc(Decorations.java:1576)
at org.eclipse.swt.widgets.Shell.windowProc(Shell.java:1937)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:4528)
at org.eclipse.swt.internal.win32.OS.TrackPopupMenu(Native Method)
at org.eclipse.swt.widgets.Menu._setVisible(Menu.java:250)
at org.eclipse.swt.widgets.Display.runPopups(Display.java:3849)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3416)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2384)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2348)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2200)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:495)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:288)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:490)
...