I think i'm getting a little closer, after reading the JAX-RPC user guild I think I need to set the: Unbound SOAP Headers on the client proxy, see http://jbws.dyndns.org/mediawiki/index.php?title=JAX-RPC_User_Guide#Unbou... I've tried this but it didn't seem to work | URL urlToWSDL = JbossWSConnection.class.getResource("/partner-wsdl.xml"); | QName q = new QName("urn:partner.soap.sforce.com", "SforceService"); | SforceService service = new SforceService(urlToWSDL, q); | Soap soapBinding = service.getSoap(); | StubExt stub = (StubExt)soapBinding; | LoginResult lr = soapBinding.login("username", "password"); | SessionHeader session = new SessionHeader(); | session.setSessionId(lr.getSessionId()) | QName headerQ = new QName(service.getServiceName().getNamespaceURI(), "SessionHeader"); | stub.addUnboundHeader(headerQ, Constants.TYPE_LITERAL_ANYTYPE, SessionHeader.class, ParameterMode.IN); | stub.setUnboundHeaderValue(headerQ, session); This is the error that I get: Caused by: org.jboss.ws.WSException: Cannot obtain serializer factory for: [xmlType={http://www.w3.org/2001/XMLSchema}anyType,javaType=class com.sforce.soap.partner.SessionHeader] at org.jboss.ws.core.soap.ObjectContent.getSerializerFactory(ObjectContent.java:189) at org.jboss.ws.core.soap.ObjectContent.marshallObjectContents(ObjectContent.java:139) at org.jboss.ws.core.soap.ObjectContent.transitionTo(ObjectContent.java:65) at org.jboss.ws.core.soap.SOAPContentElement.transitionTo(SOAPContentElement.java:129) at org.jboss.ws.core.soap.SOAPContentElement.writeElement(SOAPContentElement.java:536) at org.jboss.ws.core.soap.SOAPHeaderElementImpl.writeElement(SOAPHeaderElementImpl.java:132) at org.jboss.ws.core.soap.SOAPElementImpl.writeElementContent(SOAPElementImpl.java:825) at org.jboss.ws.core.soap.SOAPElementImpl.writeElement(SOAPElementImpl.java:810) at org.jboss.ws.core.soap.SOAPElementImpl.writeElementContent(SOAPElementImpl.java:825) at org.jboss.ws.core.soap.SOAPElementImpl.writeElement(SOAPElementImpl.java:810) at org.jboss.ws.core.soap.SOAPElementWriter.writeElementInternal(SOAPElementWriter.java:149) at org.jboss.ws.core.soap.SOAPElementWriter.writeElement(SOAPElementWriter.java:130) at org.jboss.ws.core.soap.SOAPMessageImpl.writeTo(SOAPMessageImpl.java:288) at org.jboss.ws.core.soap.SOAPMessageMarshaller.write(SOAPMessageMarshaller.java:76) at org.jboss.remoting.transport.http.HTTPClientInvoker.useHttpURLConnection(HTTPClientInvoker.java:164) I'm guessing the problem has to do with stub.addUnboundHeader(headerQ, Constants.TYPE_LITERAL_ANYTYPE, SessionHeader.class, ParameterMode.IN); any Idea on which QName xmlType I should pick? I'm using the org.jboss.ws.Constants Interface. I've also tried: | QName headerQ = new QName(service.getServiceName().getNamespaceURI(), "SessionHeader"); | SessionHeader.class, ParameterMode.IN); | stub.addUnboundHeader(headerQ, Constants.TYPE_LITERAL_STRING, String.class, ParameterMode.IN); | stub.setUnboundHeaderValue(headerQ, lr.getSessionId()); | but then I get the infamous: Exception in thread "main" javax.xml.ws.soap.SOAPFaultException: INVALID_SESSION_ID: Invalid Session ID found in SessionHeader: Illegal Session at org.jboss.ws.core.jaxws.SOAPFaultHelperJAXWS.getSOAPFaultException(SOAPFaultHelperJAXWS.java:56) at org.jboss.ws.core.jaxws.binding.SOAP11BindingJAXWS.throwFaultException(SOAP11BindingJAXWS.java:111) at org.jboss.ws.core.CommonSOAPBinding.unbindResponseMessage(CommonSOAPBinding.java:460) at org.jboss.ws.core.CommonClient.invoke(CommonClient.java:333) at org.jboss.ws.core.jaxws.client.ClientImpl.invoke(ClientImpl.java:185) at org.jboss.ws.core.jaxws.client.ClientProxy.invoke(ClientProxy.java:163) at org.jboss.ws.core.jaxws.client.ClientProxy.invoke(ClientProxy.java:149) at $Proxy22.query(Unknown Source) at salesforce.JbossWSConnection.querySample(JbossWSConnection.java:165) at salesforce.JbossWSConnection.main(JbossWSConnection.java:66) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at com.intellij.rt.execution.application.AppMain.main(AppMain.java:90) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4062129#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...