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  1. ,
    via Google Groups by Marcus Haebler

    Update "latest" to Java 8 on DockerHub.

  2. ,
    via Stack Overflow by ERJAN

    This exception occurs when using an older version of java. Mainly when trying to run a jar compiled with a newer Java version in an older Java version. We can avoid this issue by executing the jar in the same version which it was compiled.

Solutions on the web

via GitHub by CptJackieSparrow
, 1 year ago
POGOProtos/Inventory/ItemIdOuterClass$ItemId : Unsupported major.minor version 51.0
via Stack Overflow by user1444143
, 2 years ago
PacketPrinter : Unsupported major.minor version 51.0
via javaroots.com by Unknown author, 2 years ago
Test : Unsupported major.minor version 51.0
via musescore.org by Unknown author, 1 year ago
Audiveris : Unsupported major.minor version 51.0
via GitHub by yuribf
, 2 years ago
JettyLauncher : Unsupported major.minor version 51.0
java.lang.UnsupportedClassVersionError: POGOProtos/Inventory/ItemIdOuterClass$ItemId : Unsupported major.minor version 51.0 at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClassCond(ClassLoader.java:637) at java.lang.ClassLoader.defineClass(ClassLoader.java:621) 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) at ink.abb.pogo.scraper.MainKt.<clinit>(Main.kt:43)