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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 Mike Holland, 2 years ago
via Jenkins JIRA by Mike Holland, 1 year ago
via Google Groups by Steffen, 2 years ago
Bad version number in .class file
via Google Groups by Matt Raible, 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) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124) at java.net.URLClassLoader.defineClass(URLClassLoader.java:260) at java.net.URLClassLoader.access$100(URLClassLoader.java:56) at java.net.URLClassLoader$1.run(URLClassLoader.java:195) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:188) at winstone.classLoader.WebappClassLoader.loadClass(WebappClassLoader.java:68) at java.lang.ClassLoader.loadClass(ClassLoader.java:251) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319) at hudson.DNSMultiCast.<init>(DNSMultiCast.java:24) at hudson.model.Hudson.<init>(Hudson.java:628) at hudson.model.Hudson.<init>(Hudson.java:545) at hudson.WebAppMain$2.run(WebAppMain.java:222)