Run jar file with JRE

[late latch]

I can't get to run a .jar file with JRE only. it only works with JDK 20
Exception in thread "main" java.lang.UnsupportedClassVersionError: misc/GameRunner has been compiled by a more recent version of the Java Runtime (class file version 63.0), this version of the Java Runtime only recognizes class file versions up to 52.0

I want to build a .exe with JRE bundled in but I can't even get JRE to run my application which was developed in JDK 20

[tough vortex]

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[rose stone]

bundling a system-specific JRE with your application is quite difficult

I did it once by using system properties to determine the system's architecture and OS, and then auto-downloading a compatible JRE from adoptium

But I really doubt you'll be able to create a bundled EXE which does that, unless it's one of those executables that unzips itself at runtime

[late latch]

well that's the next step, i just want to get a zip file with the .exe file and then using launch4j i can set the JRE path to the bin and lib folders which are included in the zip. it works in stackoverflow and tutorials but i cant get my JRE to work

[late latch]

@rose stone do u know what to do?

[wise skiff]

Here your JRE is just not the right version. You compiled your classes with JDK 20 and your JRE is lower than that

[late latch]

hmm ok. what do you think I should do to get my .jar file into a runnable .exe that can be run without java?