Using XSLT "adapter" for invoking a WS with SOAP-ENC array type param.

Question

Hello,
I had to write a BPEL process that calls inside it a web service which has as an input an array parameter and as an output, also an array. I already know that BPEL has limitations regarding using the SOAP-ENC Array type. I tried to rewrite the web service in order to use a literal encoding of the array parameters (using "maxOccurs" attribute), but unfortunately, the OC4J container 9.0.4 that I have to use doesn't allow this. It only allows the SOAP-ENC types for array types.
I started to write, inside the BPEL process, some "adapters" XSLT transformations before and after the invoking of the web service that uses SOAP-ENC array. The XSLT transformation before the web service invoking will translate the input array parameter defined with no SOAP encoding types (based on "maxOccurs" attribute) into a SOAP-ENC type, as it is expected by the web service. The XSLT transformation after the web service invoking will translate the returned array SOAP-ENC type into a data type defined with no SOAP encoding types (based on "maxOccurs" attribute).
The approach is pretty hairy, from the XSLT point of view and it introduces a supplementary delay due to the XSLT processing needed, but it works. The only think is that when I build the service, I obtain the following error message:
[bpelc] [Error] GCDBWebservice?WSDL:30:42: src-resolve.4.2: Error resolving component 'SOAP-ENC:Array'. It was detected that 'SOAP-ENC:Array' is in namespace 'http://schemas.xmlsoap.org/soap/encoding/', but components from this namespace are not referenceable from schema ...
But in spite of this, the process is built and deployed successfully and I was able to run it from the BPEL console.
Do you think that this approach could hide some other future problems that I can't see in this moment?
Thanks,
Marinel

Answer 1

Please help me for this.
I am new to Webservices and SOAP.
I am facing problem when i am calling a "add" method in the .net webservices with the following code but it gives correct result when i'm calling the "HelloWorld" method present in the webservice.
I think it will happening because, when i'm going to pass any parameter to the "add method , it does not process it.It will return me 0.
Please help me in this.
The code is:
import java.io.*;
import java.util.*;
import java.net.*;
import org.w3c.dom.*;
import org.apache.soap.util.xml.*;
import org.apache.soap.*;
import org.apache.soap.encoding.*;
import org.apache.soap.encoding.soapenc.*;
import org.apache.soap.encoding.literalxml.*;
import org.apache.soap.rpc.*;
import org.apache.soap.transport.http.SOAPHTTPConnection;
import org.apache.soap.transport.*;
import org.apache.soap.messaging.*;
import org.apache.xerces.parsers.*;
import org.apache.xerces.dom.DocumentImpl;
public class testClient {
public static void main(String[] args) throws Exception {
URL url = new URL ("http://Eurotele-it3/webService1/Service1.asmx");
//Map the Types.
SOAPMappingRegistry smr = new SOAPMappingRegistry ();
StringDeserializer sd = new StringDeserializer ();
smr.mapTypes(Constants.NS_URI_SOAP_ENC,new QName("http://Eurotele-it3/WebService1/Service1","addResult"),Integer.class,null,sd);
// create the transport and set parameters
SOAPHTTPConnection st = new SOAPHTTPConnection();
// build the call.
Call call = new Call();
call.setSOAPTransport(st);
call.setSOAPMappingRegistry(smr);
call.setTargetObjectURI ("http://Eurotele-it3/WebService1/Service1/add");
call.setMethodName("add");
//call.setEncodingStyleURI("http://schemas.xmlsoap.org/soap/encoding/");
call.setEncodingStyleURI(Constants.NS_URI_SOAP_ENC);
Vector params = new Vector();
params.addElement(new Parameter("x",Integer.class,"10",null));
params.addElement(new Parameter("y",Integer.class,"20",null));
call.setParams(params);
Response resp = null;
try {
resp = call.invoke (url,"http://Eurotele-it3/WebService1/Service1/add");
catch (SOAPException e) {
System.err.println("Caught SOAPException (" + e.getFaultCode () + "): " +e.getMessage ());
return;
// check response
if (resp != null && !resp.generatedFault()) {
Parameter ret =resp.getReturnValue();
Object value =ret.getValue();
System.out.println ("Answer--> " +value );
else {
Fault fault = resp.getFault ();
System.err.println ("Generated fault: ");
System.out.println (" Fault Code = " + fault.getFaultCode());
System.out.println (" Fault String = " + fault.getFaultString());
This is the complete WSDL format:
<?xml version="1.0" encoding="utf-8" ?>
- <wsdl:definitions xmlns:http="http://schemas.xmlsoap.org/wsdl/http/" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:s="http://www.w3.org/2001/XMLSchema" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/" xmlns:tns="http://Eurotele-it3/WebService1/Service1" xmlns:tm="http://microsoft.com/wsdl/mime/textMatching/" xmlns:mime="http://schemas.xmlsoap.org/wsdl/mime/" targetNamespace="http://Eurotele-it3/WebService1/Service1" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/">
- <wsdl:types>
- <s:schema elementFormDefault="qualified" targetNamespace="http://Eurotele-it3/WebService1/Service1">
- <s:element name="HelloWorld">
<s:complexType />
</s:element>
- <s:element name="HelloWorldResponse">
- <s:complexType>
- <s:sequence>
<s:element minOccurs="1" maxOccurs="1" name="HelloWorldResult" type="s:int" />
</s:sequence>
</s:complexType>
</s:element>
- <s:element name="add">
- <s:complexType>
- <s:sequence>
<s:element minOccurs="1" maxOccurs="1" name="x" type="s:int" />
<s:element minOccurs="1" maxOccurs="1" name="y" type="s:int" />
</s:sequence>
</s:complexType>
</s:element>
- <s:element name="addResponse">
- <s:complexType>
- <s:sequence>
<s:element minOccurs="1" maxOccurs="1" name="addResult" type="s:int" />
</s:sequence>
</s:complexType>
</s:element>
</s:schema>
</wsdl:types>
- <wsdl:message name="HelloWorldSoapIn">
<wsdl:part name="parameters" element="tns:HelloWorld" />
</wsdl:message>
- <wsdl:message name="HelloWorldSoapOut">
<wsdl:part name="parameters" element="tns:HelloWorldResponse" />
</wsdl:message>
- <wsdl:message name="addSoapIn">
<wsdl:part name="parameters" element="tns:add" />
</wsdl:message>
- <wsdl:message name="addSoapOut">
<wsdl:part name="parameters" element="tns:addResponse" />
</wsdl:message>
- <wsdl:portType name="Service1Soap">
- <wsdl:operation name="HelloWorld">
<wsdl:input message="tns:HelloWorldSoapIn" />
<wsdl:output message="tns:HelloWorldSoapOut" />
</wsdl:operation>
- <wsdl:operation name="add">
<wsdl:input message="tns:addSoapIn" />
<wsdl:output message="tns:addSoapOut" />
</wsdl:operation>
</wsdl:portType>
- <wsdl:binding name="Service1Soap" type="tns:Service1Soap">
<soap:binding transport="http://schemas.xmlsoap.org/soap/http" style="document" />
- <wsdl:operation name="HelloWorld">
<soap:operation soapAction="http://Eurotele-it3/WebService1/Service1/HelloWorld" style="document" />
- <wsdl:input>
<soap:body use="literal" />
</wsdl:input>
- <wsdl:output>
<soap:body use="literal" />
</wsdl:output>
</wsdl:operation>
- <wsdl:operation name="add">
<soap:operation soapAction="http://Eurotele-it3/WebService1/Service1/add" style="document" />
- <wsdl:input>
<soap:body use="literal" />
</wsdl:input>
- <wsdl:output>
<soap:body use="literal" />
</wsdl:output>
</wsdl:operation>
</wsdl:binding>
- <wsdl:service name="Service1">
<documentation xmlns="http://schemas.xmlsoap.org/wsdl/" />
- <wsdl:port name="Service1Soap" binding="tns:Service1Soap">
<soap:address location="http://eurotele-it3/webService1/Service1.asmx" />
</wsdl:port>
</wsdl:service>
</wsdl:definitions>