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via Stack Overflow by Christopher Brinkley
, 1 year ago
org/webjars/WebJarExtractor$Cache : Unsupported major.minor version 51.0 "activator run" further yields: at java.lang.Classloader.defineClass1(Native Method) ...
java.lang.UnsupportedClassVersionError: org/webjars/WebJarExtractor$Cache : Unsupported major.minor version 51.0
 "activator run" further yields: at java.lang.Classloader.defineClass1(Native Method)
...	at xsbt.boot.Boot.main(Boot.scala)