Monday, September 28, 2009

Unsupported Class Version Error

The error:
Exception in thread "main" java.lang.UnsupportedClassVersionError: Bad version number in .class file

This happens when you have compiled a jar file with a newer version of Java and executing it with an older version of Java.

The Solution:
Either upgrade that Java version on the executing machine or recompile the code with the correct version.

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