java.lang.UnsupportedClassVersionError: Bad version number in .class file

Solution Verified - Updated -

Issue

  • Failure to start JBoss

  • Seeing various errors of inability to open files in conf/bootstrap and "bad version in .class file":

java.lang.UnsupportedClassVersionError: Bad version number in .class file
- When I startup EAP 5.1 for the first time I get the below error. The JDK is 64 bit :

Exception in thread "main" java.lang.UnsupportedClassVersionError: Bad version number in .class file
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
        .....
       .....

Environment

  • Red Hat JBoss Enterprise Application Platform (EAP) 5.x
  • Red Hat JBoss Service Oriented Architecture Platform (SOA) 5

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