java.lang.IllegalArgumentException: Unsupported class file major version 62

[ParzivalWolfram]

Running JDA on Debian Sid under openjdk-18-jre. Opening any JAR file will show the list of classes, but claim that the class file major is unsupported, including those of the same version as the JRE. Am I missing something?

[tnais]

Happens also using

openjdk 21.0.4 2024-07-16
OpenJDK Runtime Environment (build 21.0.4+7-Ubuntu-1ubuntu224.04)
OpenJDK 64-Bit Server VM (build 21.0.4+7-Ubuntu-1ubuntu224.04, mixed mode, sharing)

and when the major version is 61

Stack trace:

Error while decompiling NFDCSMainGUI.class:
java.lang.IllegalArgumentException: Unsupported class file major version 61
at org.objectweb.asm.ClassReader.(ClassReader.java:195)
at org.objectweb.asm.ClassReader.(ClassReader.java:176)
at org.objectweb.asm.ClassReader.(ClassReader.java:162)
at club.bytecode.the.jda.util.BytecodeUtils.loadClass(BytecodeUtils.java:30)
at club.bytecode.the.jda.FileContainer.loadClassFile(FileContainer.java:31)
at club.bytecode.the.jda.gui.fileviewer.DecompileThread.run(DecompileThread.java:41)