MenuRuntimeTest throws java.lang.NullPointerException when Repainting Menu Item
This is train-to-train regression from 1.4 to 1.5
Moreover, issue is not reproducible on jdk 6 and jdk 7

here is stacktrace:
java.lang.NullPointerException
at sun.awt.X11.XMenuPeer.repaintMenuItem(XMenuPeer.java:360)
at sun.awt.X11.XMenuItemPeer.setLabel(XMenuItemPeer.java:59)
at java.awt.MenuItem.setShortcut(MenuItem.java:309)
at MenuRuntimeTest$3.actionPerformed(MenuRuntimeTest.java:288)
at java.awt.Button.processActionEvent(Button.java:388)
at java.awt.Button.processEvent(Button.java:356)
at java.awt.Component.dispatchEventImpl(Component.java:3955)
at java.awt.Component.dispatchEvent(Component.java:3803)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:234)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)

For Steps to reptoduce and more details, see comments section