Getting below exception while calling a WebSerivce with Addressing enabled and made optional

Below error is not observed when the webservice client is running on JBoss server. But when the client is running on a WAS(7.0.0.19) server.

2012-08-07 02:19:02,348 ERROR [org.jboss.ws.core.jaxws.SOAPFaultHelperJAXWS] (http-0.0.0.0-8680-1) SOAP request exception
java.lang.NullPointerException
at org.jboss.ws.extensions.addressing.soap.SOAPAddressingPropertiesImpl.registerNamespaces(SOAPAddressingPropertiesImpl.java:235)
at org.jboss.ws.extensions.addressing.soap.SOAPAddressingPropertiesImpl.readHeaders(SOAPAddressingPropertiesImpl.java:128)
at org.jboss.ws.extensions.addressing.jaxws.WSAddressingServerHandler.handleInbound(WSAddressingServerHandler.java:116)
at org.jboss.wsf.common.handler.GenericHandler.handleMessage(GenericHandler.java:53)
at org.jboss.ws.core.jaxws.handler.HandlerChainExecutor.handleMessage(HandlerChainExecutor.java:328)
at org.jboss.ws.core.jaxws.handler.HandlerChainExecutor.handleMessage(HandlerChainExecutor.java:146)
at org.jboss.ws.core.jaxws.handler.HandlerDelegateJAXWS.callRequestHandlerChain(HandlerDelegateJAXWS.java:98)
at org.jboss.ws.core.server.ServiceEndpointInvoker.callRequestHandlerChain(ServiceEndpointInvoker.java:129)
at org.jboss.ws.core.server.ServiceEndpointInvoker.invoke(ServiceEndpointInvoker.java:176)
at org.jboss.wsf.stack.jbws.RequestHandlerImpl.processRequest(RequestHandlerImpl.java:527)
at org.jboss.wsf.stack.jbws.RequestHandlerImpl.handleRequest(RequestHandlerImpl.java:316)
at org.jboss.wsf.stack.jbws.RequestHandlerImpl.doPost(RequestHandlerImpl.java:222)
at org.jboss.wsf.stack.jbws.RequestHandlerImpl.handleHttpRequest(RequestHandlerImpl.java:147)
at org.jboss.wsf.common.servlet.AbstractEndpointServlet.service(AbstractEndpointServlet.java:87)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:235)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190)
at org.jboss.web.tomcat.service.session.ClusteredSessionValve.handleRequest(ClusteredSessionValve.java:135)
at org.jboss.web.tomcat.service.session.ClusteredSessionValve.invoke(ClusteredSessionValve.java:94)
at org.jboss.web.tomcat.service.session.LockingValve.invoke(LockingValve.java:62)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92)
at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126)
at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:829)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:598)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:662)