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Can’t use an ItemListener because my JComboBox items are generated dinamically so that would generate exceptions when the list is empty.
I need to catch basically the state after a mouse click event on an item (the problem with MouseListener is that it catches the event even when I open the list of items in the JComboBox).
Try to use
ActionListener.See How to Use Combo Boxes. Especially Handling Events on a Combo Box section.