title: java.lang.NullPointerException when invoking java web service from .net
body: <p>I am consuming a java web service from .Net web application and i get the mentioned exception "java.lang.NullPointerException", the .NET exception type is Sysem.ServiceModel.FaultException.
  I have not access to the web service code</p>
  
  <p>The web service call is :</p>
  
  <pre><code>var response = tere.agregarGuia( guia );
  </code></pre>
  
  <p>Relevant wsdl: </p>
  
  <pre><code>&lt;xs:complexType name="agregarGuia"&gt;
      &lt;xs:sequence&gt;
      &lt;xs:element minOccurs="0" name="guia" type="xs:string"/&gt;
      &lt;xs:element minOccurs="0" name="autenticacion" type="tns:autenticacion"/&gt;
      &lt;/xs:sequence&gt;
  &lt;/xs:complexType&gt;
  &lt;xs:complexType name="autenticacion"&gt;
      &lt;xs:sequence&gt;
      &lt;xs:element minOccurs="0" name="codAduana" type="xs:string"/&gt;
      &lt;xs:element minOccurs="0" name="firmaWSAA" type="xs:string"/&gt;
      &lt;xs:element minOccurs="0" name="idUsuario" type="xs:string"/&gt;
      &lt;xs:element minOccurs="0" name="ticketWSAA" type="xs:string"/&gt;&lt;/xs:sequence&gt;&lt;/xs:complexType&gt;
  .....
  &lt;operation name="agregarGuia" parameterOrder="agregarGuia"&gt;
      &lt;input message="tns:serviciotereSoap_agregarGuia"/&gt;
      &lt;output message="tns:serviciotereSoap_agregarGuiaResponse"/&gt;
  &lt;/operation&gt;
  </code></pre>
  
  <p>What could be the problem? Is there a tool that allows me to get more inside from the web service execution?</p>