JBoss fails to start due to a NoClassDefFoundError for BaseServerConfig

Issue

• I am installing Jboss EAP 5.1 on new system and it gives the following error message:

• JBoss fails to start due to the following error:

  Exception in thread "main" java.lang.NoClassDefFoundError: org/jboss/bootstrap/BaseServerConfig
      at org.jboss.bootstrap.AbstractServerImpl.doInit(AbstractServerImpl.java:190)
      at org.jboss.bootstrap.AbstractServerImpl.init(AbstractServerImpl.java:173)
      at org.jboss.bootstrap.AbstractServerImpl.init(AbstractServerImpl.java:143)
      at org.jboss.Main.boot(Main.java:218)
      at org.jboss.Main$1.run(Main.java:556)
      at java.lang.Thread.run(Thread.java:722)
  Caused by: java.lang.ClassNotFoundException: org.jboss.bootstrap.BaseServerConfig
      at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
      at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
      at java.security.AccessController.doPrivileged(Native Method)
      at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
      ... 6 more