How to get a JTextField event that started a pop up menu in Java?

Read the section from the Swing tutorial on How to Use Menus for working examples. The MouseListener is only used to display the popup, not handle the selection of the menu item. You need to add an ActionListener to each menu item to handle the selection.

You are getting the ClassCastException because the mouselistener is not on the JTextField but on the JMenuItem. They're 2 distinct components not related to each other so the JMenuItem doesn't know that the JTextField 'started it', so unless you do the association yourself you can't really achieve this directly.

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