After some unsuccessful digging I decided to post my two JComboBox related problems here hoping that someone would tell me what I'm doing wrong.
1. When I add an action listener to my JComboBox, the second and all following selections do not generate popups, they generate an error message instead. The message reads: "java.lang.Error:convertScreenLocationToParent: no window ancestor found".
2. Using setLightWeightPopupEnabled(false) produces a quick flash of the popup's background in a random location of the screen before the popup is displayed.
Any hints will be highly appreciated.