The bot strongly recommends to set package for the bug, but I have no idea at the moment where the problem is exactly. This is definitely not a Java bug, my best guess is that it's a recent problem in mutter Wayland compositor, so I'll pick that. But this just as well might be e.g. an XWayland issue. If anyone knows better, please update the package field, or let me know if I should update it.
** Package changed: ubuntu => mutter (Ubuntu) -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to mutter in Ubuntu. https://bugs.launchpad.net/bugs/1971693 Title: Alt+Tab is broken for Java (AWT/Swing) apps in Wayland session Status in mutter package in Ubuntu: Confirmed Bug description: When switching to a Java UI application using Alt+Tab, very often application's window is raised, but it doesn't get keyboard focus - it stays in the previous application, and that application continues to process keyboard events. When the problem occurs, hovering mouse over Java app's window gets the focus transferred to it. This problem only happens in Wayland session, not in X.Org session. It can be reproduced in Ubuntu 22.04, but not in 20.04.4 version. --- $ lsb_release -rd Description: Ubuntu 22.04 LTS Release: 22.04 --- The problem seems to affect all Java versions - reproduced for different OpenJDK builds (8, 11, 17, 18). It can also be observed for Java version provided by Ubuntu's 'default-jre' package (11.0.15+10-Ubuntu-0ubuntu0.22.04.1). Source code for a minimal Java application, for which the problem can be reproduced, is attached. Download the provided JTextFieldTest.java file, then from terminal prompt execute 'java JTextFieldTest.java' (Java 11 or later is required, command should be executed from the location of the downloaded file). App's window with a text field will be opened. Click with mouse on the terminal window, then press Alt+Tab and enter some text. Expected result: focus is switched to Java app's window, and text appears in its text field. Actual result: Java app's window is raised, but focus stays in terminal window, and typed text appears there. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1971693/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
