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From "Kwiatkowski, Jeremy" <jkwiatkow...@fcg.com>
Subject ClassCastException on Return Value of service when axis.streaming is enabled (latest 1.2 CVS)
Date Thu, 20 Jan 2005 03:51:12 GMT
I'm getting a class cast exception on the return value of my service
call (both server & client generated using wsdl2java)
 
        public java.lang.String
_import(com.fcg.dmsl.fdk.services.common.WebServiceValueObject
properties, javax.activation.DataHandler theDocument) throws
java.rmi.RemoteException {

        ...
        setRequestHeaders(_call);
        setAttachments(_call);
        // *** This should be a java.lang.String.  Instead, its an
instance of the same typed as the 1st argument (properties)
        java.lang.Object _resp = _call.invoke(new java.lang.Object[]
{properties, theDocument});
 
        if (_resp instanceof java.rmi.RemoteException) {
            throw (java.rmi.RemoteException)_resp;
        }
        else {
            extractAttachments(_call);
            try {
                return (java.lang.String) _resp;
            } catch (java.lang.Exception _exception) {
                // *** Which eventually causes the ClassCastException
here
                return (java.lang.String)
org.apache.axis.utils.JavaUtils.convert(_resp, java.lang.String.class);
            }
        }

I think I traced this down to the following code in 
 
package org.apache.axis.message;
...
public class BodyBuilder extends SOAPHandler
...
    public SOAPHandler onStartChild(String namespace,
                                     String localName,
                                     String prefix,
                                     Attributes attributes,
                                     DeserializationContext context)
...
                // Only deserialize this way if there is a unique
operation
                // for this QName.  If there are overloads,
                // we'll need to start recording.  If we're making a
high-
                // fidelity recording anyway, don't bother (for now).
                if (msgContext != null && !msgContext.isHighFidelity()
&&
                        (operations == null || operations.length == 1))
{
                    ((RPCElement)element).setNeedDeser(false);
                    handler = new RPCHandler((RPCElement)element,
false);                // *** Hard coded false seems wrong to me
                    if (operations != null) {
 
((RPCHandler)handler).setOperation(operations[0]);
                        msgContext.setOperation(operations[0]);
                    }
                }

The 2nd argument to the RPCHandler() constructor is named "isResponse"
 
    public RPCHandler(RPCElement rpcElem, boolean isResponse)

 
It seems wrong to me that this should be hard-coded to false.  It
appears that this code is (also) used when deserializing the response
from the server.  Since the RPCHandler class uses the "isResponse" flag
to determine what the type should be, this explains why my Axis client
code is incorrectly thinking the return value is the same type as my
first request parameter.
 
Also, the test for msgContext.isHighFidelity() explains why streaming
needs to be in effect for this issue to arise.
 
As a quick test, I changed this to "true", and my Axis client
application worked fine.  However, this can't be the right fix, since I
suppose that this same code is used to deserialize the request message
on the server side.
 
I noted that the one other call to the RPCHandler constructor determined
the value of isResponse as follows.
 
        boolean isResponse = ((msg != null) &&
 
Message.RESPONSE.equals(msg.getMessageType()));
 
        // We're going to need this below, so create one.
        RPCHandler rpcHandler = new RPCHandler(this, isResponse);

Hopefully, this is coherent.
 
Regards,
 
Jeremy

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