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Trying to run

java -Xmx4G -Xms4G -jar launch.jar

but that leads to error

Exception in thread "main" java.lang.UnsupportedClassVersionError: launch.jar has been
compiled by a more recent version of the Java Runtime (class file version 61.0), 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(ClassLoader.java:756)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:473)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:355)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
    at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:632)

I found this topic but solution doesn't change anything.

Using macOS 13.4 (22F66); Java version is 1.8.0_371, tried to install Java 17 with Homebrew brew install openjdk@17

Do you have any answer to this, ideally by using only command lines as in 1 ?

Improve this question
21
  • Relaunch system do not change anything. Commented Aug 17, 2023 at 15:43
  • The latest OpenJDK is 20. Why would you go with such an old version of Java when the error message specifically states "it was compiled with a more recent version of Java"? Commented Aug 17, 2023 at 16:00
  • Thanks, trying with brew install openjdk@20. Commented Aug 17, 2023 at 16:04
  • Same error in output. Do you know if there is a way to force shell to execute with this version of openjdk ? Commented Aug 17, 2023 at 16:09
  • 1
    Wait...did you literally use foobar.jar? That's a placeholder for whatever jar file you actually want to run. Commented Aug 17, 2023 at 17:26

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