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    via Stack Overflow by ERJAN

    This exception occurs when using an older version of java. Mainly when trying to run a jar compiled with a newer Java version in an older Java version. We can avoid this issue by executing the jar in the same version which it was compiled.

Solutions on the web

via Google Groups by momalxa, 7 months ago
Bad version number in .class > file
via Google Groups by p.do...@gmail.com, 2 years ago
via knowcoding.com by Unknown author, 2 years ago
via java-forums.org by Unknown author, 2 years ago
Bad version number in .class file
java.lang.UnsupportedClassVersionError: Bad version number in .class file	at java.lang.ClassLoader.defineClass1(Native Method)	at java.lang.ClassLoader.defineClass(Unknown Source)