JBoss EAP not starting with error occurred during initialization of VM java/lang/NoClassDefFoundError: java/lang/Object

Issue

• Extracted jdk-6u45-linux-amd64.bin.tar and copied with cp -R /usr/java/jdk-6u45-linux-amd64.extract/usr/java/jdk1.6.0_45/ /usr/java/. After installing JBoss v5.1.2 and starting, this is happening: Error occurred during initialization of VM java/lang/NoClassDefFoundError: java/lang/Object

• Using two versions of JDK in the environment JDK 6 & JDK 7.
  JDK 7 is used by JBoss EAP v6.1.1. which is running fine
  JDK 6 is used by JBoss EAP v5.1.2 which is not starting and gives the error: Error occurred during initialization of VM java/lang/NoClassDefFoundError: java/lang/Object