java.lang.UnsupportedClassVersionError: com/google/appengine/tools/enhancer/Enhance : Unsupported major.minor version 51.0 at java.lang.ClassLoader.defineClass1(Native Method)

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Root Cause Analysis

  1. 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()
  2. Java RT
    ClassLoader.loadClass
    1. java.lang.ClassLoader.defineClassCond(Unknown Source)
    2. java.lang.ClassLoader.defineClass(Unknown Source)
    3. java.security.SecureClassLoader.defineClass(Unknown Source)
    4. java.net.URLClassLoader.defineClass(Unknown Source)
    5. java.net.URLClassLoader.access$000(Unknown Source)
    6. java.net.URLClassLoader$1.run(Unknown Source)
    7. java.security.AccessController.doPrivileged(Native Method)
    8. java.net.URLClassLoader.findClass(Unknown Source)
    9. java.lang.ClassLoader.loadClass(Unknown Source)
    10. sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    11. java.lang.ClassLoader.loadClass(Unknown Source)
    11 frames