JPopupMenu Behavior

Answer 1

In Java 6 on Windows, I cannot get the popup to even display with the code you have provided. On the other hand, if I change your superclass to JFrame, it works as desired, with the popup going away when I click outside of the window. Is there a reason why you are using JWindow as your superclass and not JFrame? If you wish to have a border-less/title-less window, you can call setUndecorated(true) on your JFrame (before you set visible and pack, of course.)

Answer 2

What about hiding the menu if it's visible from within the MouseExited method?

Answer 3

Take a look at the Java Doc for JWindow.isFocusableWindow A JWindow cannot be the focused window unless it has an owner and the owner is visible. You're using the default constructor, so your JWindow has the shared owner asn is not focusable. When it is not focusable, it cannot detect the loss of focus when you click somewhere else.

I changed JWindow to JFrame and added a call to setUndecorated(true); before the call to setVisible and it's working for me. If these changes do not make it work for you, please post the version of Java you are using: java -fullversion