web service invocation using Jboss 6 throwing null pointer exception, works fine with jboss 5

I am new to webservice and jboss 6 ,earlier I was working with Jboss 5 and my we wervice was working fine but as a part of migration to RichFaces 4 we moved to J boss 6, and now I have started getting this problem.
While invoking JAXb web service (SOAP) using JBOSS 6 Final I am getting a null pointer Exception: the complete stack Trace is as follows:

WARN [org.apache.cxf.phase.PhaseInterceptorChain] Interceptor for

{http://www.webservice.weservice1/}

weservice1#

{http://www.webservice.weservice1/}

Some_method has thrown exception, unwinding now: java.lang.NullPointerException
at com.cognizant.epc.webservice.SoapHeaderHandler.handleMessage(SoapHeaderHandler.java:57) [:]
at com.cognizant.epc.webservice.SoapHeaderHandler.handleMessage(SoapHeaderHandler.java:27) [:]
at org.apache.cxf.jaxws.handler.HandlerChainInvoker.invokeHandleMessage(HandlerChainInvoker.java:335) [:2.3.1-patch-01]
at org.apache.cxf.jaxws.handler.HandlerChainInvoker.invokeHandlerChain(HandlerChainInvoker.java:253) [:2.3.1-patch-01]
at org.apache.cxf.jaxws.handler.HandlerChainInvoker.invokeProtocolHandlers(HandlerChainInvoker.java:131) [:2.3.1-patch-01]
at org.apache.cxf.jaxws.handler.soap.SOAPHandlerInterceptor.handleMessageInternal(SOAPHandlerInterceptor.java:171) [:2.3.1-patch-01]
at org.apache.cxf.jaxws.handler.soap.SOAPHandlerInterceptor.handleMessage(SOAPHandlerInterceptor.java:126) [:2.3.1-patch-01]
at org.apache.cxf.jaxws.handler.soap.SOAPHandlerInterceptor.handleMessage(SOAPHandlerInterceptor.java:71) [:2.3.1-patch-01]
at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:255) [:2.3.1-patch-01]
at org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:113) [:2.3.1-patch-01]
at org.apache.cxf.transport.servlet.ServletDestination.invoke(ServletDestination.java:97) [:2.3.1-patch-01]
at org.apache.cxf.transport.servlet.ServletController.invokeDestination(ServletController.java:461) [:2.3.1-patch-01]
at org.jboss.wsf.stack.cxf.ServletControllerExt.invoke(ServletControllerExt.java:172) [:3.4.1.GA]
at org.jboss.wsf.stack.cxf.RequestHandlerImpl.handleHttpRequest(RequestHandlerImpl.java:57) [:3.4.1.GA]
at org.jboss.wsf.stack.cxf.transport.ServletHelper.callRequestHandler(ServletHelper.java:156) [:3.4.1.GA]
at org.jboss.wsf.stack.cxf.CXFServletExt.invoke(CXFServletExt.java:90) [:3.4.1.GA]
at org.apache.cxf.transport.servlet.AbstractHTTPServlet.handleRequest(AbstractHTTPServlet.java:179) [:2.3.1-patch-01]
at org.apache.cxf.transport.servlet.AbstractHTTPServlet.doPost(AbstractHTTPServlet.java:103) [:2.3.1-patch-01]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:754) [:1.0.0.Final]
at org.apache.cxf.transport.servlet.AbstractHTTPServlet.service(AbstractHTTPServlet.java:159) [:2.3.1-patch-01]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:324) [:6.1.0.Final]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:242) [:6.1.0.Final]
at com.cognizant.epc.filter.ErrorFilter.doFilter(ErrorFilter.java:39) [:]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:274) [:6.1.0.Final]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:242) [:6.1.0.Final]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275) [:6.1.0.Final]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161) [:6.1.0.Final]
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:181) [:6.1.0.Final]
at org.jboss.modcluster.catalina.CatalinaContext$RequestListenerValve.event(CatalinaContext.java:285) [:1.1.0.Final]
at org.jboss.modcluster.catalina.CatalinaContext$RequestListenerValve.invoke(CatalinaContext.java:261) [:1.1.0.Final]
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:88) [:6.1.0.Final]
at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:100) [:6.1.0.Final]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:159) [:6.1.0.Final]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [:6.1.0.Final]
at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158) [:6.1.0.Final]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [:6.1.0.Final]
at org.jboss.web.tomcat.service.request.ActiveRequestResponseCacheValve.invoke(ActiveRequestResponseCacheValve.java:53) [:6.1.0.Final]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:362) [:6.1.0.Final]
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877) [:6.1.0.Final]
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:654) [:6.1.0.Final]
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:951) [:6.1.0.Final]
at java.lang.Thread.run(Thread.java:619) [:1.6.0_12]

Please Provide me a solution to this problem. Thanks in advance!