org.apache.xerces.dom.DeferredDocumentImpl.getXmlStandalone()Z reason

org.apache.xerces.dom.DeferredDocumentImpl.getXmlStandalone()Z

Reason : It occurs when xercesImpl-X.X.X.jar doesn't exist in the class path.
Solution : Just replace xerces-X.X-X.jar to xercesImpl-X.X.X.jar.

You can download xercesImpl-X.X.X.jar the following URL.
http://mirrors.ibiblio.org/pub/mirrors/maven/mule/dependencies/maven2/xerces/xercesImpl/2.9.1/xercesImpl-2.9.1.jar