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java.lang.NullPointerException: parent is
 null	at java.awt.PopupMenu.show(PopupMenu.java:149)	at PopupMenuTest$PopupListener.maybeShowPopup(PopupMenuTest.java:50)	at PopupMenuTest$PopupListener.mouseReleased(PopupMenuTest.java:45)	at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:290)