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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.
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java.lang.UnsupportedClassVersionError: (com/allen_sauer/gwt/log/ > > server/RemoteLoggerServiceImpl) bad major version at offset=6
at java.lang.ClassLoader.defineClassImpl(Native Method)