Getting java.lang.NoClassDefFoundError: com/sun/org/apache/xerces/internal/dom/DocumentImpl in JBoss

Issue

• The Webservice application deployed on JBoss is not working, it is throwing errors on server.log file. The same webservice is working properly on Tomcat 6.0.3.
• We are getting the following below exception in the server.log file,

Caused by: java.lang.NoClassDefFoundError: com/sun/org/apache/xerces/internal/dom/DocumentImpl
    at java.lang.ClassLoader.defineClass1(Native Method) [rt.jar:1.7.0_21]
...
...
Caused by: java.lang.ClassNotFoundException: com.sun.org.apache.xerces.internal.dom.DocumentImpl from [Module "deployment.xxx.war:main" from Service Module Loader]
    at org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:190)