Ok I have managed to create a simple example of the behavior. Please note that I am pretty new to webservices and JBossWS (started using it a few days ago) so sorry if something is overly complicated. Feedback is highly appreciated.
I am using JBoss 4.2.0.GA and java version "1.5.0_08" I started with the following WSDL (I have modified an echo tutorial I found on the web so please dont be confused by the namespace and other irregularities): | <?xml version="1.0" encoding="UTF-8"?> | <definitions name='EchoService' targetNamespace='http://echo/' | xmlns='http://schemas.xmlsoap.org/wsdl/' | xmlns:soap='http://schemas.xmlsoap.org/wsdl/soap/' | xmlns:tns='http://echo/' | xmlns:xsd='http://www.w3.org/2001/XMLSchema'> | <types> | <xs:schema targetNamespace='http://echo/' version='1.0' | xmlns:tns='http://echo/' | xmlns:xs='http://www.w3.org/2001/XMLSchema'> | | <xs:complexType name='Something'> | <xs:sequence> | <xs:element minOccurs='0' name='arg0' type='xs:string' /> | </xs:sequence> | </xs:complexType> | | <xs:complexType name='A'> | <xs:sequence> | <xs:element minOccurs='0' name='arg0' type='xs:string' /> | </xs:sequence> | </xs:complexType> | | <xs:complexType name='B'> | <xs:complexContent> | <xs:extension base="tns:A"> | <xs:sequence> | <xs:element minOccurs='0' name='arg1' type='xs:string' /> | </xs:sequence> | </xs:extension> | </xs:complexContent> | </xs:complexType> | <xs:complexType name='C'> | <xs:complexContent> | <xs:extension base="tns:B"> | <xs:sequence> | <xs:element minOccurs='0' name='arg2' type='xs:string' /> | </xs:sequence> | </xs:extension> | </xs:complexContent> | </xs:complexType> | | <xs:complexType name="BResponse"> | <xs:sequence> | <xs:element name="something" type="tns:Something" minOccurs="1" maxOccurs="1" nillable="true"/> | <xs:element name="b" type="tns:B" minOccurs="1" maxOccurs="1" nillable="true"/> | </xs:sequence> | </xs:complexType> | | <xs:element name="bResponse" type="tns:BResponse"/> | <xs:element name="something" type="tns:Something"/> | </xs:schema> | </types> | | <message name='GetB_Request' /> | | <message name='GetB_GetBResponse'> | <part name='para' element="tns:bResponse"/> | </message> | | <portType name='GetB'> | <operation name='getB' > | <input message='tns:GetB_Request'/> | <output message='tns:GetB_GetBResponse' /> | </operation> | </portType> | <binding name='GetBBinding' type='tns:GetB'> | <soap:binding style='document' transport='http://schemas.xmlsoap.org/soap/http' /> | <operation name='getB'> | <soap:operation soapAction='' /> | <input> | <soap:body use='literal' /> | </input> | <output> | <soap:body use='literal' /> | </output> | </operation> | </binding> | <service name='GetBService'> | <port binding='tns:GetBBinding' name='GetBPort'> | <soap:address location='REPLACE_WITH_ACTUAL_URL' /> | </port> | </service> | </definitions> | We have an A->B->C Class Hierarchy here, and a BResponse Complex Type which consists of a "B" and a "Something". Note the "minOccurs=1 maxOccurs=1 nillable=true " . If I throw the file at wsconsume it creates a number of classes. The BResponse Class looks like this: | @XmlAccessorType(XmlAccessType.FIELD) | @XmlType(name = "BResponse", propOrder = { | "something", | "b" | }) | public class BResponse { | | @XmlElement(required = true, nillable = true) | protected Something something; | @XmlElement(required = true, nillable = true) | protected B b; | ....} | I have written a very simple Server: | @javax.jws.WebService(endpointInterface="echo.GetB", serviceName="GetBService", targetNamespace="http://echo/";, portName="GetBPort" ) | public class DummyGetB implements GetB { | | public BResponse getB() { | | BResponse response = new BResponse(); | | C c = new C(); | c.setArg0("1"); | c.setArg1("2"); | c.setArg2("3"); | | response.setB(c); | | return response; | } | | } | and a Client: | public class Client { | | public static void main(String[] args) throws Exception { | GetBService getB = new GetBService(new URL("http://127.0.0.1:8080/server?wsdl";),new QName("http://echo/";, "GetBService")); | | GetB getBPort = getB.getGetBPort(); | BResponse bResponse = getBPort.getB(); | | System.out.println(bResponse.getB().getClass()); | B b = bResponse.getB(); | System.out.println(b.getArg0()); | System.out.println(b.getArg1()); | C c = (C)bResponse.getB(); | System.out.println(c.getArg2()); | } | If I try this example I get: | class echo.B | 1 | 2 | Exception in thread "main" java.lang.ClassCastException: echo.B | at at.ac.arsenal.Client.main(Client.java:53) | Only a "B" gets transmitted, although it should be a "C" Now, to get the behavior I was talking about change the minOccurrs parameter of something element of BResponse to 0: | .............. | <xs:complexType name="BResponse"> | <xs:sequence> | <xs:element name="something" type="tns:Something" minOccurs="0" maxOccurs="1" nillable="true"/> | <xs:element name="b" type="tns:B" minOccurs="1" maxOccurs="1" nillable="true"/> | </xs:sequence> | </xs:complexType> | ................ | Then rerun wsconsume. The generated BResponse class now looks like this. Notice the JAXBElement type of variable something; | @XmlAccessorType(XmlAccessType.FIELD) | @XmlType(name = "BResponse", propOrder = { | "something", | "b" | }) | public class BResponse { | | @XmlElementRef(name = "something", type = JAXBElement.class) | protected JAXBElement<Something> something; | @XmlElement(required = true, nillable = true) | protected B b; | I Recompile and Redeploy the server then rerun the Client. The output is now: | class echo.C | 1 | 2 | 3 | now C gets transmitted and the arg2 property has the correct value. As I said before this is of course no solution to the original problem, but I think it might be useful in tracking down the source of it. 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