How to return null element with Camel-CXF

[Chubutin]

Hi! 

I'm having problems when I try to return a null element in SOAP response.
When I send a null body as response to CXF Bean, this Bean doesn't create a
null response and return that null element to the response. So, i want to
return a null element in the response but I can't.

If I test the service with mocks I can see if the response is 

[1]
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/";
xmlns:ves="http://service.esb.com/";>
   <soapenv:Header/>
   <soapenv:Body>
      <ves:getByNameResponse/>
   </soapenv:Body>
</soapenv:Envelope>

This will get a null element in the response and this is what I want.

But, CXF doesn't make that response with any element in the body response.




My camel route with CXF consumer, processors, http call and xslt 

this is my route 

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<route group="com.esb.camel.route.InternalGetRouteBuilder"
id="searchByNameRouteGET" xmlns="http://camel.apache.org/schema/spring";>
    <from uri="cxf:bean:getConsumerEndpoint"/>
    <to uri="getByNamePreProcessor"/>
    <setHeader headerName="CamelHttpQuery">
        <property>params_tos</property>
    </setHeader>
    <setHeader headerName="CamelHttpMethod">
        <simple>GET</simple>
    </setHeader>
    <setBody>
        <expressionDefinition/> (this is setBody(xpath("/*"))
    </setBody>
    <to
uri="http://192.168.16.201:10080/apex/api/query?authUsername=n4api&authPassword=lookitup&authMethod=Basic&httpClient.authenticationPreemptive=true"/>
    <to uri="xslt:xslt/transformationByNameXSLT.xslt?failOnNullBody=false"/>
<unmarshal>
        <protobuf xsi:type="dataFormat"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"/>
    </unmarshal>
</route>

I use a dataformat at the end to Marshall the XML after the XSLT. When I
send null to the dataformat it get an exception.

After the xslt transformation I send many thing to test, but I cant get
figure what to configure in my service to response a null response. like [1]

I only can response a not null response, like 

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/";
xmlns:ves="http://vessel.service.esb.com/";>
   <soapenv:Header/>
   <soapenv:Body>
      <ves:getVesselVisitByNameResponse>
         <vesselVisitor/>
      </ves:getVesselVisitByNameResponse>
   </soapenv:Body>
</soapenv:Envelope>

My CXF bean is 

        <camelcxf:cxfEndpoint id="getConsumerEndpoint"
                serviceClass="com.esb.service.vessel.VesselVisitorsService"
                address="/vesselVisitorsService">
                <camelcxf:properties>
                        <entry key="dataFormat" value="POJO" />
                </camelcxf:properties>
        </camelcxf:cxfEndpoint>


The SEI of The service is 

@WebService(name = "VesselVisitorsService")
@SOAPBinding(parameterStyle = SOAPBinding.ParameterStyle.WRAPPED, style =
Style.DOCUMENT, use = Use.LITERAL)
public interface com.esb.service.vessel.VesselVisitorsService
{

        
        @WebMethod(operationName = "getByName")
        @RequestWrapper(localName = "visitorName")
        @ResponseWrapper(localName = "getByNameResponse")
        @WebResult(name = "vesselVisitor")
        @SOAPBinding(parameterStyle = SOAPBinding.ParameterStyle.WRAPPED, style 
=
Style.DOCUMENT, use = Use.LITERAL)
        public VesselVisitor getByName(
                        @WebParam(name = "vesselName") String vesselName) throws
ServiceException;



In org.apache.cxf.databinding.AbstractWrapperHelper


Object wrapperObject = createWrapperObject(wrapperType);
            
            for (int x = 0; x < setMethods.length; x++) {
                if (getMethods[x] == null
                    && setMethods[x] == null 
                    && fields[x] == null) {
                    //this part is a header or something
                    //that is not part of the wrapper.
                    continue;
                }
              *  Object o = lst.get(x); [2]*
                o = getPartObject(x, o);                
                if (o instanceof List && getMethods[x] != null) {
                    List col =
CastUtils.cast((List<?>)getMethods[x].invoke(wrapperObject));
                    if (col == null) {
                        //broken generated java wrappers
                        if (setMethods[x] != null) {
                            setMethods[x].invoke(wrapperObject, o);
                        } else {
                            fields[x].set(wrapperObject, lst.get(x));
                        }
                    } else {
                        List olst = CastUtils.cast((List<?>)o);
                        col.addAll(olst);
                    }
                } else if (setMethods[x] != null) {                        
                    setMethods[x].invoke(wrapperObject, o);
                } else if (fields[x] != null) {
                    fields[x].set(wrapperObject, lst.get(x));
                }
            }


The line remarked is what get the NPE. So in debugging I initialized a List
and put a null element to the list. And with this I had a null valid
response!  

So, Does I always have to response with a list with a element inside the
wrapper to make  a null response? 


Thank you!



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