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  1. ,
    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.

  2. ,
    via Google Groups by Marcus Haebler

    Update "latest" to Java 8 on DockerHub.

Solutions on the web

via Google Groups by momalxa, 10 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(ClassLoader.java:620)