NullPointer Exception of JAXWS interface

[xuhb]

Hi:
 if wsdl operation's input message is empty(zero part), but output message has 
multi part. then the generated JAXWS service will raise NullPointer Exception;
Such a wsdl is not practical , only for marginal testing;

version :     CXF-2.3.3;  I haven't try the latest CXF version;

Here is a example:

  <wsdl:message name="notifyRequest">
  </wsdl:message>
  <wsdl:message name="notifyReponse">
    <wsdl:part name="r0" element="ns:SimpleSymbol"/>
    <wsdl:part name="r1" element="ns:Symbol"/>
  </wsdl:message>

   <wsdl:operation name="notify">
      <wsdl:input message="axis2:notifyRequest">
    </wsdl:input>
      <wsdl:output message="axis2:notifyReponse">
    </wsdl:output>
   </wsdl:operation>

JAXWS Operation is :
public void notify(Holder<String> r0, Holder<SymbolType> r1) {
}

Analyse: 
    Because when <soap:Body> has no child element, the DocLiteralInterceptor 
doesn't create a MessageContentsList ( because input is nothing)

    But HolderInInterceptor will always except the MessageContentsList exists; 
so nullPointer raised while accesing the MessageContentsList

Exception Stack Trace:

java.lang.NullPointerException
 at 
org.apache.cxf.jaxws.interceptors.HolderInInterceptor.handleMessage(HolderInInterceptor.java:78)
 at 
org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:255)
 at 
org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:113)
 at 
org.apache.cxf.transport.http_jetty.JettyHTTPDestination.serviceRequest(JettyHTTPDestination.java:322)
 at 
org.apache.cxf.transport.http_jetty.JettyHTTPDestination.doService(JettyHTTPDestination.java:291)
 at 
org.apache.cxf.transport.http_jetty.JettyHTTPHandler.handle(JettyHTTPHandler.java:72)
 at 
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:936)
 at 
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:873)
 at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)
 at 
org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:247)
 at 
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
 at org.eclipse.jetty.server.Server.handle(Server.java:346)
 at 
org.eclipse.jetty.server.HttpConnection.handleRequest(HttpConnection.java:581)
 at 
org.eclipse.jetty.server.HttpConnection$RequestHandler.content(HttpConnection.java:1057)
 at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:807)
 at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:220)
 at org.eclipse.jetty.server.HttpConnection.handle(HttpConnection.java:411)
 at 
org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:526)
 at 
org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:41)
 at 
org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:528)
 at java.lang.Thread.run(Thread.java:595)