Getting "java.lang.UnsupportedClassVersionError:org/jboss/modules/Main has been compiled by a more recent version of the Java Runtime " error in EAP 8.

Issue

• Getting below error while trying to migrate from 7.x to EAP 8.

  ERROR Migration failed: org.jboss.migration.core.ServerMigrationFailureException: java.lang.UnsupportedClassVersionError: 
  org/wildfly/core/embedded/EmbeddedProcessStartException has been compiled by a more recent version of the Java Runtime (class file version 55.0), 
  this version of the Java Runtime only recognizes class file versions up to 52.0
  ......
  ......
  Caused by: java.lang.UnsupportedClassVersionError: org/wildfly/core/embedded/EmbeddedProcessStartException has been compiled by a more recent 
   version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0
        at java.lang.ClassLoader.defineClass1(Native Method) [rt.jar:1.8.0_144]
        at java.lang.ClassLoader.defineClass(ClassLoader.java:763) [rt.jar:1.8.0_144]
  

• Getting "java.lang.UnsupportedClassVersionError" while starting/stopping EAP 8.

  Error: A JNI error has occurred, please check your installation and try again
  Exception in thread "main" java.lang.UnsupportedClassVersionError: org/jboss/modules/Main has been compiled by a more recent version of the Java 
  Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0
          at java.lang.ClassLoader.defineClass1(Native Method)
          at java.lang.ClassLoader.defineClass(ClassLoader.java:756)
          at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)