java.lang.UnsupportedClassVersionError: org/jruby/Main : Unsupported major.minor version 51.0

GitHub | larryzhao | 10 months ago
  1. 0
    Update "latest" to Java 8 on DockerHub.
    via Google Groups by Marcus Haebler
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    You're using an older version of java with classes compiled for java7
    via GitHub by Athou
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    using jruby-9.0.5.0 reports `Could not find the main class: org/jruby/Main. Program will exit.`

    GitHub | 10 months ago | larryzhao
    java.lang.UnsupportedClassVersionError: org/jruby/Main : Unsupported major.minor version 51.0
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    GitHub comment 1178#161068789

    GitHub | 1 year ago | paynito
    java.lang.UnsupportedClassVersionError: org/jruby/Main : Unsupported major.minor version 51.0
  6. 0

    Unsupported Java major.minor version 51.0 w/ OS X 10.10 Yosemite

    GitHub | 3 years ago | takahiro47
    java.lang.UnsupportedClassVersionError: org/elasticsearch/bootstrap/Elasticsearch : Unsupported major.minor version 51.0

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Root Cause Analysis

  1. java.lang.UnsupportedClassVersionError

    org/jruby/Main : Unsupported major.minor version 51.0

    at java.lang.ClassLoader.findBootstrapClass()
  2. Java RT
    ClassLoader.loadClass
    1. java.lang.ClassLoader.findBootstrapClass(Native Method)
    2. java.lang.ClassLoader.findBootstrapClass0(ClassLoader.java:909)
    3. java.lang.ClassLoader.loadClass(ClassLoader.java:318)
    4. java.lang.ClassLoader.loadClass(ClassLoader.java:316)
    5. sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
    6. java.lang.ClassLoader.loadClass(ClassLoader.java:268)
    6 frames