[castor-dev] How is schema instance supported in castor framework?

[Liu, Scott]

Hi, all,

I am using castor framework in a web service project. I have built a
prototype involving Axis, castor and .NET, which worked pretty well.
Thanks to all, who has contributed to the success of the castor project.


I have moved from prototyping to the actual project recently and
generated server side code using Castor. But I encountered a problem in
unmarshalling an inherited xml element on the server side when I ran my
application.

Basically there is a base element with type of "Record" and several
elements with types extending the base type of "Record" (see below for
the schema section). I have a .NET client which marshaled it
successfully as below in the soap request. 

         <soap:Body>
            <addRequest xmlns="urn:webservices">
               <record xmlns:q1="urn:crm" xsi:type="q1:Event">
                  <q1:title>A test event</q1:title>
 
<q1:startDate>2004-02-21T01:01:01.008:00</q1:startDate>
              </record>
            </addRequest>
         </soap:Body>

Notice that the body contains an element "record" with instance type of
"Event".

The soap request then was posted to the server and I was expecting
Castor would recognize the "record" element with schema instance
"q1:Event" and unmarshal it using "EventDescriptor" class instead of the
"RecordDescriptor" class. Since "Record" descriptor does not have
elements defined in the "event" descriptor and it failed with the
following message as indicated in the soap response. 

         <soapenv:Body>  
            <soapenv:Fault>   
               <faultcode>soapenv:Server.userException</faultcode>   
               <faultstring>org.xml.sax.SAXException: Unable to marshall
between XML and Castor Objects :unable to find FieldDescriptor for
&apos;title&apos; in ClassDescriptor of Record</faultstring>   
               <detail>    
                  <ns1:stackTrace ................. />
               </detail>  
            </soapenv:Fault> 
         </soapenv:Body>

Can anyone tell me how to solve this inheritance issue in castor
marshalling/unmarshalling process?

Any hint or suggestion is extremely welcome.

Thanks,

Scott

P.S. the schema involving the base record and the elements inherited
from the it.

        <complexType name="Record" abstract="true">
                <attribute name="key" type="xsd:string"/>
        </complexType>
        <element name="record" type="dto:Record"/>

        <xsd:element name="Event" type="act:Event"/>
        <xsd:complexType name="Event">
                <xsd:complexContent>
                        <xsd:extension base="dto:Record">
                                <xsd:sequence>
                                        <xsd:element name="title"
type="xsd:string"/>
                                        <xsd:element name="startDate"
type="xsd:dateTime" minOccurs="0"/>
                                </xsd:sequence>
                        </xsd:extension>
                </xsd:complexContent>
        </xsd:complexType>

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