java version issue

[john.woollett@…]

Hi, Have just moved to windows11, am trying to rum JOSM from command line, but get this error

C:\Users\johnw\Desktop>java -jar josm-tested.jar
Exception in thread "main" java.lang.UnsupportedClassVersionError: org/openstreetmap/josm/gui/MainApplication has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0

at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)

[gaben]

Recent JOSM versions require Java 11 or newer, so you have to upgrade your Java at least to 11.

Or you can use the JOSM installer from the front page which installs everything for you: download/windows/josm-setup.msi