Cursor set in JDialog not behaving correctly

Question

I have a JFrame which creates a custom modal JDialog. In the JDialog I set the Cursor to WAIT_CURSOR when a certain button is clicked.
If I move the mouse outside the bounds of the JDialog, it changes back to an arrow, then if I move back to the JDialog it stays an arrow when it still should be a hourglass.
I've tried setting the cursor on the JFrame and JDialog at the same time and it still doesn't behave correctly.
Has anyone experienced this with multiple frames or dialogs, and figured out how to get it to behave?

Answer 1

Note also that if you set the cursor and then perform your task in the ui thread, there is much that can be done to remedy your problem. In other words the dispatch thread processes mouse events in order to set the cursor, but if you're keeping the dispatch thread busy the mouse events will not be processed. Hence, when you move the mouse outside the dialog and back again the dialog can't process the mouse events in order to change the cursor.