Hello, AWT Team. Please review the fix for the issue: https://bugs.openjdk.java.net/browse/JDK-8058193 The fix is available at: http://cr.openjdk.java.net/~pchelko/9/8058193/webrev/
The problem is that we consume Enter key by a combo box action and it's not propagated up to the dialog. Enter does not trigger any real action on the closed ComboBox, so it should be disabled if the combo popup is not visible. With best regards. Petr.