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  1. ,
    via Google Groups by Marcus Haebler

    Update "latest" to Java 8 on DockerHub.

  2. ,
    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 Jenkins JIRA by Jean-Baptiste Lièvremont, 2 years ago
via Jenkins JIRA by Jean-Baptiste Lièvremont, 1 year ago
via Stack Overflow by Dani
, 2 years ago
via Coderanch by Shashank Sharma, 1 year ago
Bad version number in .class file
via Oracle Community by 1001448, 2 years ago
java.lang.UnsupportedClassVersionError: Bad version number in .class file at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:621) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124) at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1853) at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:875) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1330) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1209) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320) at hudson.DNSMultiCast.<init>(DNSMultiCast.java:26) at hudson.model.Hudson.<init>(Hudson.java:691) at hudson.model.Hudson.<init>(Hudson.java:605) at hudson.WebAppMain$2.run(WebAppMain.java:221)