Hi,

When I generate the classes using a WSDL I get a return type of Object[] instead of the java.util.List object. From what I understand List is serializable.

Any reason why it is changing the return type to Object[]?

Thanks,

-Ray

Here's a little more info on this subject:

Java interface used to generate WSDL.
//**** iDAO.java
import java.util.List;

public interface iDAO {
        public List executeQuery(String s);
        public int executeUpdate(String s);
}


WSDL file generate by running Java2WSDL using iDAO.class (above)
//****daoservice.wsdl
<?xml version="1.0" encoding="UTF-8"?>
<wsdl:definitions targetNamespace="http://Interface.daopackage" xmlns:impl="http://Interface.daopackage" xmlns:intf="http://Interface.daopackage" xmlns:apachesoap="http://xml.apache.org/xml-soap" xmlns:wsdlsoap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns="http://schemas.xmlsoap.org/wsdl/">
   <wsdl:message name="executeUpdateResponse">
      <wsdl:part name="executeUpdateReturn" type="xsd:int"/>
   </wsdl:message>
   <wsdl:message name="executeQueryResponse">
      <wsdl:part name="executeQueryReturn" type="soapenc:Array"/>
   </wsdl:message>
   <wsdl:message name="executeQueryRequest">
      <wsdl:part name="in0" type="xsd:string"/>
   </wsdl:message>
   <wsdl:message name="executeUpdateRequest">
      <wsdl:part name="in0" type="xsd:string"/>
   </wsdl:message>
   <wsdl:portType name="iDAO">
      <wsdl:operation name="executeQuery" parameterOrder="in0">
         <wsdl:input name="executeQueryRequest" message="impl:executeQueryRequest"/>
         <wsdl:output name="executeQueryResponse" message="impl:executeQueryResponse"/>
      </wsdl:operation>
      <wsdl:operation name="executeUpdate" parameterOrder="in0">
         <wsdl:input name="executeUpdateRequest" message="impl:executeUpdateRequest"/>
         <wsdl:output name="executeUpdateResponse" message="impl:executeUpdateResponse"/>
      </wsdl:operation>
   </wsdl:portType>
   <wsdl:binding name="DAOServiceSoapBinding" type="impl:iDAO">
      <wsdlsoap:binding style="rpc" transport="http://schemas.xmlsoap.org/soap/http"/>
      <wsdl:operation name="executeQuery">
         <wsdlsoap:operation soapAction=""/>
         <wsdl:input name="executeQueryRequest">
            <wsdlsoap:body use="encoded" encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" namespace="http://Interface.daopackage"/>
         </wsdl:input>
         <wsdl:output name="executeQueryResponse">
            <wsdlsoap:body use="encoded" encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" namespace="http://Interface.daopackage"/>
         </wsdl:output>
      </wsdl:operation>
      <wsdl:operation name="executeUpdate">
         <wsdlsoap:operation soapAction=""/>
         <wsdl:input name="executeUpdateRequest">
            <wsdlsoap:body use="encoded" encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" namespace="http://Interface.daopackage"/>
         </wsdl:input>
         <wsdl:output name="executeUpdateResponse">
            <wsdlsoap:body use="encoded" encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" namespace="http://Interface.daopackage"/>
         </wsdl:output>
      </wsdl:operation>
   </wsdl:binding>
   <wsdl:service name="iDAOService">
      <wsdl:port name="DAOService" binding="impl:DAOServiceSoapBinding">
         <wsdlsoap:address location="http://thehost:8082/axis/services/DAOService"/>
      </wsdl:port>
   </wsdl:service>
</wsdl:definitions>


IDAO.java generated by running WSDL2Java using above WSDL.
/**
 * IDAO.java
 *
 * This file was auto-generated from WSDL
 * by the Apache Axis WSDL2Java emitter.
 */

package com.rf3labs.services.dbconn.dao.ws;

public interface IDAO extends java.rmi.Remote {
    public java.lang.Object[] executeQuery(java.lang.String in0) throws java.rmi.RemoteException;
    public int executeUpdate(java.lang.String in0) throws java.rmi.RemoteException;
}

You will notice that the return type of executeQuery method is java.lang.Object[] rather than what was defined in iDAO.java interface whic is java.util.List.

Ray:
    Axis generates client-side classes from the service's WSDL. In the WSDL you have NO WAY of knowing how is a collection (list, set or whatever) implemented in the server-side. So, Axis makes a choice and returns Object[].
    What if you're trying to use a third-party WebService? You don't know if it is implemented in Java (where you have java.util.List) or COBOL (where you have something else I don't know).
    I believe there's some weird way to plug your own code generator into WSDL2Java, if you MUST use java.util.List.

Regards,
Martin

Check this link:

http://www-106.ibm.com/developerworks/xml/library/ws-tip-roundtrip1.html

I think ur problem is similiar to the one expalined in the article....