java.lang.UnsupportedClassVersionError: org/webjars/WebJarExtractor$Cache : Unsupported major.minor version 51.0 "activator run" further yields: at java.lang.Classloader.defineClass1(Native Method) ...

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    Lightbend Activator failed to load sbt configuration on Ubuntu that works on Windows

    Stack Overflow | 10 months ago | Christopher Brinkley
    java.lang.UnsupportedClassVersionError: org/webjars/WebJarExtractor$Cache : Unsupported major.minor version 51.0 "activator run" further yields: at java.lang.Classloader.defineClass1(Native Method) ...

    Root Cause Analysis

    1. java.lang.UnsupportedClassVersionError

      org/webjars/WebJarExtractor$Cache : Unsupported major.minor version 51.0 "activator run" further yields: at java.lang.Classloader.defineClass1(Native Method) ...

      at xsbt.boot.Boot.main()
    2. SBT Launcher
      Boot.main
      1. xsbt.boot.Boot.main(Boot.scala)
      1 frame