No X11 DISPLAY variable was set

[anonymous]

I cannot open josm-tested.jar. I ran java -jar josm-tested.jar.

System

OS: Fedora Linux
DE: KDE Plasma 6
Display: Wayland (X11 doesn't come with Fedora. lol)

Console log

2025-09-24 05:29:29.186 INFO: Log level is at INFO (INFO, 800)
2025-09-24 05:29:29.225 INFO: Missing preference file '/home/remy/.config/JOSM/preferences.xml'. Creating a default preference file.
2025-09-24 05:29:29.808 INFO: Detected usable IPv6 network, preferring IPv6 over IPv4 after next restart.
2025-09-24 05:29:29.867 SEVERE: Handled by bug report queue: java.awt.HeadlessException: No X11 DISPLAY variable was set,
or no headful library support was found,
but this program performed an operation which requires it,
java.awt.HeadlessException:
No X11 DISPLAY variable was set,
or no headful library support was found,
but this program performed an operation which requires it,

at java.desktop/java.awt.GraphicsEnvironment.checkHeadless(GraphicsEnvironment.java:164)
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:76)
at org.openstreetmap.josm.gui.MainApplication.createMainFrame(MainApplication.java:1050)
at org.openstreetmap.josm.gui.MainApplication.mainJOSM(MainApplication.java:898)
at org.openstreetmap.josm.gui.MainApplication$3.processArguments(MainApplication.java:280)
at org.openstreetmap.josm.gui.MainApplication.main(MainApplication.java:766)

ReportedException [thread=Thread#1,main,5,, exception=java.awt.HeadlessException:
No X11 DISPLAY variable was set,
or no headful library support was found,
but this program performed an operation which requires it,
, methodWarningFrom=BugReportExceptionHandler#handleException]

at org.openstreetmap.josm.tools.bugreport.BugReport.intercept(BugReport.java:222)
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:695)
at java.base/java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:690)
at java.base/java.lang.Thread.dispatchUncaughtException(Thread.java:2902)

Caused by: java.awt.HeadlessException:
No X11 DISPLAY variable was set,
or no headful library support was found,
but this program performed an operation which requires it,

at java.desktop/java.awt.GraphicsEnvironment.checkHeadless(GraphicsEnvironment.java:164)
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:76)
at org.openstreetmap.josm.gui.MainApplication.createMainFrame(MainApplication.java:1050)
at org.openstreetmap.josm.gui.MainApplication.mainJOSM(MainApplication.java:898)
at org.openstreetmap.josm.gui.MainApplication$3.processArguments(MainApplication.java:280)
at org.openstreetmap.josm.gui.MainApplication.main(MainApplication.java:766)

[stoecker]

Something is wrong with your setup or you tried to run JOSM on a remote system.

[anonymous]

Replying to stoecker:

Something is wrong with your setup or you tried to run JOSM on a remote system.

!>X11 error
!>Fedora Linux doesn't come with X11
!>"DE: KDE Plasma 6"

Uh, no. lmao

[anonymous]

Also, Fedora doesn't include X11 for a reason: It's in the process of being deprecated in favour of Wayland. GTX, Gnome, and Ubuntu has already dropped support for X11.

It's really old, and not that secure. I don't think forcing users to install legacy software that's being deprecated is a good idea.

[stoecker]

If you choose to install a system without X11, then you wont have Java GUI support ATM. As said, your system is broken. This has nothing to do with JOSM.

​https://wiki.openjdk.org/display/wakefield
​https://wiki.openjdk.org/display/wakefield/Pure+Wayland+toolkit+prototype