AWT-EventQueue-1 on JList?

The issue is that you declare popup as a class variable and then create a local instance of popup in the init method. The result is that the class level popup is never set to anything and causes an NPE when you try to use it in checkPopup. Changing the line: JPopupMenu popup = new JPopupMenu() to popup = new JPopupMenu() should fix the issue.

The issue is that you declare popup as a class variable and then create a local instance of popup in the init method. The result is that the class level popup is never set to anything and causes an NPE when you try to use it in checkPopup. Changing the line: JPopupMenu popup = new JPopupMenu(); to popup = new JPopupMenu(); should fix the issue.

Thanks! It worked! Although now I get this error not really an error more like a warning sign: imgur.Com/27wI5 – weka Feb 2 at 5:13.

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