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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.

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via Jenkins JIRA by Matthew Buckett, 2 years ago
via Jenkins JIRA by Matthew Buckett, 1 year ago
via apache.org by Unknown author, 2 years ago
via Google Groups by momalxa, 1 year 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.lang.ClassLoader.defineClass(ClassLoader.java:465) at hudson.remoting.RemoteClassLoader.findClass(RemoteClassLoader.java:96) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at java.lang.ClassLoader.loadClass(ClassLoader.java:251) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319) at hudson.FilePath.act(FilePath.java:434) at hudson.FilePath.copyTo(FilePath.java:869) at hudson.FilePath.copyTo(FilePath.java:857) at hudson.maven.reporters.MavenArtifact.archive(MavenArtifact.java:184)