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Maximally trivial Swing app with a JTextField, which triggers a keyboard focus issue with JDK 1.7 on X11. Run with: mvn compile && mvn exec:java Update ====== Turns out this problem has been identified: http://bugs.sun.com/view_bug.do?bug_id=6798064 With a JDK build without the realNativeFocusedWindow check behavior is back to what one expects from JDK 1.6. Data ==== data/xev-stumpwm-focustoggle.log contains the output of 'xev' for a session in which: (1) xev is started, in focus. (2) i switch focus away (3) and back (4) and close the window data/xev-metacity-focustoggle.log contains similar for metacity (plus mouse events). To be clear, this is for the xev Window. I don't know of a tool or method to obtain the equivalent protocol capture for another client. Observations ============ With openjdk6 and openjdk7 both I see activated and open on initial start (not necessarily in order): java.awt.event.WindowEvent[WINDOW_ACTIVATED,opposite=null,oldState=0,newState=0] on frame0 java.awt.event.WindowEvent[WINDOW_OPENED,opposite=null,oldState=0,newState=0] on frame0 In both cases, switching away produces a DEACTIVATED: java.awt.event.WindowEvent[WINDOW_DEACTIVATED,opposite=null,oldState=0,newState=0] on frame0 However, in both cases, switching back does not generate an ACTIVATED. In both cases I must take additional action to make the window activated: java.awt.event.WindowEvent[WINDOW_ACTIVATED,opposite=null,oldState=0,newState=0] on frame0 With openjdk6, it is sufficient to click in the window. With openjdk7 I must keep the focus on another window in the same workspace, but click this app's window with the *mouse*. Another difference is that with openjdk6 on start-up I get an ICONIFIED after OPENED: java.awt.event.WindowEvent[WINDOW_ICONIFIED,opposite=null,oldState=0,newState=0] on frame0 Focus lost/gained ================= With both OpenJDK 6 and 7 (in stumpwm), switching between two windows produce no FOCUS_GAINED events ever. The only time I saw a FOCUS_GAINED was on initial start-up of the application. FOCUS_LOST is dispatched when I switch away, but there is no FOCUS_GAINED when I switch back. Clicking the mouse also does not generate FOCUS_GAINED. Hypothesis: FOCUS_GAINED is simply broken in both cases, but for whatever reason it happens to be the case that in OpenJDK 6 the mouse clicks end up triggering caret activation in spite of no FOCUS_GAINED event being seen (might this even be a bug? I don't know what correct behavior is with respect to focus). Next up - figure out why FOCUS_GAINED is not dispatched. Ok, adding some System.out.println()'s to sun.awt.X11.XWindowPeer.handleFocusEvent() indicates that focus events are not even reaching that point.