I am using Jboss-4.0.5 and JbossWS-1.2.1. I get this error, and it occurs now and then. 80% of the time it works and 20% of the time it throws the following error.

2007-08-24 17:09:41,540 ERROR [org.jboss.ws.jaxrpc.SOAPFaultExceptionHelper] Err
or creating SOAPFault message
java.lang.NullPointerException
 at com.sun.org.apache.xerces.internal.dom.NodeImpl.toString(Unknown Sour
ce)
 at org.jboss.ws.soap.NodeImpl.toString(NodeImpl.java:561)
 at java.lang.String.valueOf(String.java:1475)
 at org.jboss.lang.JBossStringBuilder.append(JBossStringBuilder.java:116)
 at org.jboss.ws.soap.SOAPContentElement.appendChild(SOAPContentElement.j
ava:713)
 at org.jboss.ws.soap.SOAPElementImpl.addChildElement(SOAPElementImpl.jav
a:221)
 at org.jboss.ws.soap.SOAPContentElement.addChildElement(SOAPContentEleme
nt.java:441)
 at org.jboss.ws.soap.SOAPFaultImpl.setFaultCode(SOAPFaultImpl.java:253)
 at org.jboss.ws.soap.SOAPBodyImpl.addFault(SOAPBodyImpl.java:133)
 at org.jboss.ws.jaxrpc.SOAPFaultExceptionHelper.toSOAPMessage(SOAPFaultE
xceptionHelper.java:214)
 at org.jboss.ws.jaxrpc.SOAPFaultExceptionHelper.exceptionToFaultMessage(
SOAPFaultExceptionHelper.java:188)
 at org.jboss.ws.server.ServiceEndpoint.handleRequest(ServiceEndpoint.jav
a:223)
 at org.jboss.ws.server.ServiceEndpointManager.processSOAPRequest(Service
EndpointManager.java:355)
 at org.jboss.ws.server.StandardEndpointServlet.doPost(StandardEndpointSe
rvlet.java:115)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
 at org.jboss.ws.server.StandardEndpointServlet.service(StandardEndpointS
ervlet.java:76)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:252)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:173)
 at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFi
lter.java:96)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:202)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:173)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:213)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:178)
 at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(Securit
yAssociationValve.java:175)
 at org.apache.catalina.authenticator.AuthenticatorBase.invoke(Authentica
torBase.java:524)
 at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValv
e.java:74)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:126)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:105)
 at org.jboss.web.tomcat.tc5.jca.CachedConnectionValve.invoke(CachedConne
ctionValve.java:156)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:107)
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav
a:148)
 at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:869)
 at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.p
rocessConnection(Http11BaseProtocol.java:664)
 at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpo
int.java:527)
 at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWor
kerThread.java:112)
 at java.lang.Thread.run(Thread.java:797)
2007-08-24 17:09:41,541 ERROR [org.jboss.ws.server.StandardEndpointServlet] Erro
r processing web service request
Servlet.service
() for servlet AutoLendingServlet threw exception
javax.xml.rpc.JAXRPCException: Cannot create SOAPFault message for: javax.xml.rp
c.soap.SOAPFaultException: java.lang.NullPointerException
 at org.jboss.ws.jaxrpc.SOAPFaultExceptionHelper.exceptionToFaultMessage(
SOAPFaultExceptionHelper.java:194)
 at org.jboss.ws.server.ServiceEndpoint.handleRequest(ServiceEndpoint.jav
a:223)
 at org.jboss.ws.server.ServiceEndpointManager.processSOAPRequest(Service
EndpointManager.java:355)
 at org.jboss.ws.server.StandardEndpointServlet.doPost(StandardEndpointSe
rvlet.java:115)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
 at org.jboss.ws.server.StandardEndpointServlet.service(StandardEndpointS
ervlet.java:76)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:252)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:173)
 at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFi
lter.java:96)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:202)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:173)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:213)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:178)
 at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(Securit
yAssociationValve.java:175)
 at org.apache.catalina.authenticator.AuthenticatorBase.invoke(Authentica
torBase.java:524)
 at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValv
e.java:74)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:126)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:105)
 at org.jboss.web.tomcat.tc5.jca.CachedConnectionValve.invoke(CachedConne
ctionValve.java:156)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:107)
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav
a:148)
 at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:869)
 at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.p
rocessConnection(Http11BaseProtocol.java:664)
 at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpo
int.java:527)
 at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWor
kerThread.java:112)
 at java.lang.Thread.run(Thread.java:797)

The Client side is registering the SOAP request which was sent down to the server, and everything looks OK. Is there any known issue regarding this?