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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)