如何在启动jboss服务器时解决ClassNotFound异常

Question

启动jboss 7.1时出现以下错误

            Exception in thread "main" java.lang.NoClassDefFoundError:

            Caused by: java.lang.ClassNotFoundException:

            at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
            at java.security.AccessController.doPrivileged(Native Method)
            at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
            at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
            at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
            at java.lang.ClassLoader.loadClass(ClassLoader.java:248)

如何解决此异常.....？ 请任何人帮我出去......？