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Samebug tips

  1. ,
    via GitHub by Athou

    You're using an older version of java with classes compiled for java7

  2. ,
    via Google Groups by Marcus Haebler

    Update "latest" to Java 8 on DockerHub.

Solutions on the web

via Stack Overflow by RanSch
, 2 years ago
com/google/appengine/tools/enhancer/Enhance : Unsupported major.minor version 51.0
via Google Groups by user2231256 via StackOverflow, 6 months ago
com/google/appengine/tools/enhancer/Enhance : Unsupported major.minor version 51.0
via co.jp by Unknown author, 1 year ago
com/google/appengine/tools/enhancer/Enhance : Unsupported major.minor version 51.0
via Google Groups by Mitch Sundt, 9 months ago
com/google/appengine/tools/admin/AppCfg : Unsupported major.minor version 51.0
via Google Groups by Michael Stevens, 9 months ago
com/google/appengine/tools/admin/AppCfg : Unsupported major.minor version 51.0
via Google Groups by Mitch Sundt, 9 months ago
com/google/appengine/tools/admin/AppCfg : Unsupported major.minor version 51.0
java.lang.UnsupportedClassVersionError: com/google/appengine/tools/enhancer/Enhance : Unsupported major.minor version 51.0 at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631) at java.lang.ClassLoader.defineClass(ClassLoader.java:615) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141) at java.net.URLClassLoader.defineClass(URLClassLoader.java:283) at java.net.URLClassLoader.access$000(URLClassLoader.java:58) at java.net.URLClassLoader$1.run(URLClassLoader.java:197) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:247)