No X11 DISPLAY variable was set

[u6aab]

I'm using fedora 38 with kde. when I try to launch josm from the desktop launcher, the icon on the panel disappears after a few seconds, no gui is shown but system monitor reports it running. when trying to launch from the command line I get this error:

[user@fedora ~]$ flatpak run org.openstreetmap.josm Using /app/jre/bin/java to execute josm. Can't open display 2023-10-16 17:02:39.420 INFO: Log level is at INFO (INFO, 800) 2023-10-16 17:02:40.863 SEVERE: Handled by bug report queue: java.awt.HeadlessException: No X11 DISPLAY variable was set, but this program performed an operation which requires it. java.awt.HeadlessException: No X11 DISPLAY variable was set, but this program performed an operation which requires it. at java.desktop/java.awt.GraphicsEnvironment.checkHeadless(GraphicsEnvironment.java:166) at java.desktop/java.awt.Window.<init>(Window.java:553) at java.desktop/java.awt.Frame.<init>(Frame.java:428) at java.desktop/java.awt.Frame.<init>(Frame.java:393) at java.desktop/javax.swing.JFrame.<init>(JFrame.java:180) at org.openstreetmap.josm.gui.MainFrame.<init>(MainFrame.java:74) at org.openstreetmap.josm.gui.MainApplication.createMainFrame(MainApplication.java:1004) at org.openstreetmap.josm.gui.MainApplication.mainJOSM(MainApplication.java:853) at org.openstreetmap.josm.gui.MainApplication$3.processArguments(MainApplication.java:277) at org.openstreetmap.josm.gui.MainApplication.main(MainApplication.java:742) ReportedException [thread=Thread[main,5,], exception=java.awt.HeadlessException: No X11 DISPLAY variable was set, but this program performed an operation which requires it., methodWarningFrom=BugReportExceptionHandler#handleException] at org.openstreetmap.josm.tools.bugreport.BugReport.intercept(BugReport.java:213) at org.openstreetmap.josm.tools.bugreport.BugReportExceptionHandler.handleException(BugReportExceptionHandler.java:22) at org.openstreetmap.josm.tools.bugreport.BugReportExceptionHandler.uncaughtException(BugReportExceptionHandler.java:14) at java.base/java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:1082) at java.base/java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:1077) at java.base/java.lang.Thread.dispatchUncaughtException(Thread.java:2008) Caused by: java.awt.HeadlessException: No X11 DISPLAY variable was set, but this program performed an operation which requires it. at java.desktop/java.awt.GraphicsEnvironment.checkHeadless(GraphicsEnvironment.java:166) at java.desktop/java.awt.Window.<init>(Window.java:553) at java.desktop/java.awt.Frame.<init>(Frame.java:428) at java.desktop/java.awt.Frame.<init>(Frame.java:393) at java.desktop/javax.swing.JFrame.<init>(JFrame.java:180) at org.openstreetmap.josm.gui.MainFrame.<init>(MainFrame.java:74) at org.openstreetmap.josm.gui.MainApplication.createMainFrame(MainApplication.java:1004) at org.openstreetmap.josm.gui.MainApplication.mainJOSM(MainApplication.java:853) at org.openstreetmap.josm.gui.MainApplication$3.processArguments(MainApplication.java:277) at org.openstreetmap.josm.gui.MainApplication.main(MainApplication.java:742)

[muelli]

java.awt.HeadlessException: No X11 DISPLAY variable was set,

hm. We're setting the app as X11 only:

org.openstreetmap.josm/org.openstreetmap.josm.yaml

Line 10 in a1eae34

- --socket=x11

I don't know what else we can do.
This should affect any other x11-only app, too.