Message d'erreur SOAPUI axis 2 Spring

Bonjour ,
j'ai un fichier wsdl qui contient 2 méthodes une pour la somme de deux variables ( x,y) et l'autre pour l'ajout .
j’utilise le SoapUi pour tester ce fichier en effet la méthode de la somme fonctionne tandis que la méthode de l'ajout me provoque l'erreur suivant ,,,:calim2:

Code:

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<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
   <soapenv:Body>
      <soapenv:Fault>
         <faultcode>soapenv:Server</faultcode>
         <faultstring>unknown</faultstring>
         <detail>
            <Exception>org.apache.axis2.AxisFault
	at org.apache.axis2.AxisFault.makeFault(AxisFault.java:430)
	at com.jalma.ws.sommeservice.SommeServiceMessageReceiverInOut.invokeBusinessLogic(SommeServiceMessageReceiverInOut.java:101)
	at org.apache.axis2.receivers.AbstractInOutMessageReceiver.invokeBusinessLogic(AbstractInOutMessageReceiver.java:40)
	at org.apache.axis2.receivers.AbstractMessageReceiver.receive(AbstractMessageReceiver.java:100)
	at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:176)
	at org.apache.axis2.transport.http.HTTPTransportUtils.processHTTPPostRequest(HTTPTransportUtils.java:275)
	at org.apache.axis2.transport.http.AxisServlet.doPost(AxisServlet.java:133)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
	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.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
	at java.lang.Thread.run(Thread.java:595)
Caused by: java.lang.NullPointerException
	at com.jalma.service.somme.SommeServiceImpl.ajouter(SommeServiceImpl.java:35)
	at com.jalma.ws.sommeservice.SommeServiceSkeleton.ajouter(SommeServiceSkeleton.java:47)
	at com.jalma.ws.sommeservice.SommeServiceMessageReceiverInOut.invokeBusinessLogic(SommeServiceMessageReceiverInOut.java:51)
	... 19 more</Exception>
         </detail>
      </soapenv:Fault>
   </soapenv:Body>
</soapenv:Envelope>

merci d'avance :ccool: