RE: Serializers/Deserializers

[Hung D. Viet]

This error seems that SOAP doesn't recorgnized your deserializer.

I have noticed you didn't declared properly the namespace for your
deserializer in deployment descriptor.

In client code, you registered:

<quote>
smr.mapTypes(Constants.NS_URI_SOAP_ENC,
                new QName("urn:SimpleURLService", "URL"), URL.class, ser,
des);
</quote>

Hence in DD file, you should have the same namespace. Instead of using
namespace "http://www.w3.org/1999/XMLSchema";, you should the namespace you
registered in client code, which is "urn:SimpleURLService".

It means, in your DD file, instead of:
     xmlns:xsd="http://www.w3.org/1999/XMLSchema"; qname="xsd:URL"
You should change to:
     xmlns:xsd="urn:SimpleURLService" qname="xsd:URL"


That may get rid of the Deserializer error :-)

cheers,
Hung











-----Original Message-----
From: David Turner [mailto:[EMAIL PROTECTED]]
Sent: Thursday, October 25, 2001 10:12 PM
To: [EMAIL PROTECTED]
Subject: Serializers/Deserializers


Has anyone developed their own serializers & deserializers for their
classes instead of using the BeanSerializer?

I've attempted to write my own serializer/deserializer for the
java.net.URL class in order to pass URL's to my service method, but the
server sends back a fault:
      Fault Code = SOAP-ENV:Server.Exception:
      Fault String = org/apache/soap/util/xml/Deserializer

I've attempted to write serializers/deserializers for a simple class
also (class contains only Strings) instead of the BeanSerializer and I
still get the above exception.

Anybody know what's going wroing?  How do you set this up on both the
client and server (deployment descr)?

Below is the code:

Deployment Descriptor
----------------------------------------------------------------------------
----------------------------------

<isd:service xmlns:isd="http://xml.apache.org/xml-soap/deployment";
             id="urn:SimpleURLService">
  <isd:provider type="java"
                scope="Session"
                methods="serviceMethod">
    <isd:java
class="examples.omnitide.SimpleURLService.SimpleURLService"
static="false"/>
  </isd:provider>


<isd:faultListener>org.apache.soap.server.DOMFaultListener</isd:faultListene
r>

  <isd:mappings>
    <isd:map encodingStyle="http://schemas.xmlsoap.org/soap/encoding/";
             xmlns:xsd="http://www.w3.org/1999/XMLSchema";
qname="xsd:URL"
             javaType="java.net.URL"

xml2JavaClassName="examples.omnitide.SimpleURLService.URLDeserializer"/>

  </isd:mappings>

</isd:service>



Client that calls soap service
----------------------------------------------------------------------------
----------------------------------

      // Map the types
       SOAPMappingRegistry smr = new SOAPMappingRegistry();

       URLSerializer ser = new URLSerializer();
       URLDeserializer des = new URLDeserializer();

       smr.mapTypes(Constants.NS_URI_SOAP_ENC, new
QName("urn:SimpleURLService", "URL"),
           URL.class, ser, des);

       // Build the call
       Call call = new Call();
       call.setSOAPMappingRegistry(smr);
       call.setEncodingStyleURI(Constants.NS_URI_SOAP_ENC);
       call.setTargetObjectURI("urn:SimpleURLService");
       call.setMethodName("serviceMethod");

       Vector params = new Vector();
       params.addElement(new Parameter("request", URL.class, url,
null));
       call.setParams(params);



Serializer
----------------------------------------------------------------------------
----------------------------------

import java.net.URL;

public class URLSerializer implements Serializer
{

  public void marshall(String inScopeEncStyle, Class javaType, Object
src,
                       Object context, Writer sink, NSStack nsStack,
                       XMLJavaMappingRegistry xjmr, SOAPContext ctx)
                        throws IllegalArgumentException, IOException
  {
      nsStack.pushScope();

      SoapEncUtils.generateStructureHeader(inScopeEncStyle, javaType,
context,
                                          sink, nsStack, xjmr);

      sink.write(StringUtils.lineSeparator);

      URL src2 = (URL) src;

      Parameter param;

      param = new Parameter("URL", String.class, src2.toString(), null);

      xjmr.marshall(inScopeEncStyle, Parameter.class, param, null,
                    sink, nsStack, ctx);
      sink.write(StringUtils.lineSeparator);

      sink.write("</" + context + ">");

      nsStack.popScope();
  }
}



Deserializer
----------------------------------------------------------------------------
----------------------------------

public class URLDeserializer implements Deserializer
{
  public Bean unmarshall(String inScopeEncStyle, QName elementType, Node
src,
                         XMLJavaMappingRegistry xjmr, SOAPContext ctx)
                          throws IllegalArgumentException
  {
    Element root = (Element)src;
    Element tempEl = DOMUtils.getFirstChildElement(root);

    URL url = null;

    while (tempEl != null)
    {
        Bean paramBean = xjmr.unmarshall(inScopeEncStyle,
RPCConstants.Q_ELEM_PARAMETER,
                                         tempEl, ctx);
        Parameter param = (Parameter)paramBean.value;
        String tagName = tempEl.getTagName();

        if (tagName.equals("URL"))
        {
            try
            {
                url = new URL( (String)param.getValue() );
            }
            catch (Exception e)
            {
                throw new IllegalArgumentException("Problem
instantianting bean: " + e.getMessage());
            }

        }

        tempEl = DOMUtils.getNextSiblingElement(tempEl);
    }


    return new Bean(URL.class, url);
  }
}