Question

Calling ASP.NET Web Service from Java client using Axis

Asked by: Triskelion

...new to Java and just messing around...
I am attempting to call the "BigAdd" method on this page:
http://www.meizlik.com/Service.asmx

I get a multitude of errors no matter what I try; the latest of which is a NullReferenceException:
    at BigAddService.Bob_Services.BigAdd_Method(String a1, String a2)
    at BigAddService.Bob_Services.BigAdd(String addend_1, String addend_2)

I just want to see this work.  Any suggestions or answers?

import org.apache.axis.client.Call;
import org.apache.axis.client.Service;
import org.apache.axis.encoding.XMLType;
import javax.xml.namespace.QName;
import javax.xml.rpc.NamespaceConstants;
import javax.xml.rpc.ParameterMode;
import java.net.URL;
 
public class JavaWS3
{
	public static void main(String [] args)
	{
		try
		{
			////////////////////////////////////////////////////////////////////
			// Responds the same with or without the ?WSDL
			String	strEndPoint		= "http://www.meizlik.com/Service.asmx";
			String	strSoapAction	= "http://www.meizlik.com/BigAdd";
			String	strSchemaURL	= "http://www.w3.org/2001/XMLSchema";
			String	strParamName1	= "addend_1";
			String	strParamName2	= "addend_2";
			String	strParameterVal1= "6";
			String	strParameterVal2= "7";
			String	strFunctionName	= "BigAdd";
 
			//Call	call   = (Call) new Service().createCall();//Works
			//Call	call   = new Call(strSoapAction);//Works same
			Call	call   = new Call(strEndPoint);//Works same
 
			call.setEncodingStyle(NamespaceConstants.NSURI_SOAP_ENCODING);
			//
			call.setTargetEndpointAddress(new URL(strEndPoint));
			//
			////////////////////////////////////////////////////////////////////
			// first parameter in QName seemingly takes ANYTHING
			call.setOperationName(new QName(strSchemaURL, strFunctionName));
 
			////////////////////////////////////////////////////////////////////
			// Set the name of the parameter and the return type
			call.setReturnType(XMLType.XSD_STRING);
			call.addParameter(strParamName1, XMLType.XSD_STRING, ParameterMode.IN);
			call.addParameter(strParamName2, XMLType.XSD_STRING, ParameterMode.IN);
 
			//
			////////////////////////////////////////////////////////////////////
			// Catch the result and print it
			// Parameter count is now ONE (1).
			// call.setUseSOAPAction(true);//Not Necessary
			call.setSOAPActionURI(strSoapAction);//Yes Necessary
 
			String	strResult = (String) call.invoke(
				new Object[] {
					new String(strParameterVal1),
					new String(strParameterVal2)
					}
				);
 
			System.out.println("Result='" + strResult + "'");
		}
		catch (Exception e)
		{
			System.err.println(e.toString());
		}
	}
}

                                  
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Asked On
2008-07-15 at 13:28:57ID23567542
Tags

Sun, Microsoft

,

Web Services, Axis, ASP.NET

,

JDK 6

Topics

Java Standard Edition

,

New to Java Programming

,

Web Services Description Language

Participating Experts
1
Points
500
Comments
5

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Answers

 

by: shivaspkPosted on 2008-07-16 at 10:58:17ID: 22018451

Can you show me the exception, and as such if you don't want to use SOAP you can also go with HTML post its very simple too

take a look at my solution here

http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/SOAP/Q_23510450.html

 

by: TriskelionPosted on 2008-07-16 at 18:55:16ID: 22021807

Thanks for the respose Shivaspk.
Yes, I do want to use SOAP.
Your "POST" solution is neat, but still requires parsing the XML to get the result.
I could use it in different applications however.

Please see the attached Exception.

C:\science\java>java JavaWS3
System.Web.Services.Protocols.SoapException: Server was unable to process reques
t. ---> System.NullReferenceException: Object reference not set to an instance o
f an object.
   at BigAddService.Bob_Services.BigAdd_Method(String a1, String a2)
   at BigAddService.Bob_Services.BigAdd(String addend_1, String addend_2)
   --- End of inner exception stack trace ---

                                              
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by: shivaspkPosted on 2008-07-16 at 18:56:20ID: 22021813

OK here is your code :)

Problem was with Qnames

import org.apache.axis.client.Call;
import org.apache.axis.client.Service;
import org.apache.axis.encoding.XMLType;
import javax.xml.namespace.QName;
import javax.xml.rpc.NamespaceConstants;
import javax.xml.rpc.ParameterMode;
import java.net.URL;
 
public class JavaWS3
{
	public static void main(String [] args)
	{
		try
		{
			////////////////////////////////////////////////////////////////////
			// Responds the same with or without the ?WSDL
			String	strEndPoint		= "http://www.meizlik.com/Service.asmx";
			String	strSoapAction	= "http://www.meizlik.com/BigAdd";
			String	strSchemaURL	= "http://www.w3.org/2001/XMLSchema";
			String	strParamName1	= "addend_1";
			String	strParamName2	= "addend_2";
			String	strParameterVal1= "10";
			String	strParameterVal2= "7";
			String	strFunctionName	= "BigAdd";
 
			//Call	call   = (Call) new Service().createCall();//Works
			//Call	call   = new Call(strSoapAction);//Works same
			//Call	call   = new Call(strEndPoint);//Works same
			Service  service = new Service();
			 
	         Call call= (Call) service.createCall();
 
 
			call.setEncodingStyle(NamespaceConstants.NSURI_SOAP_ENCODING);
			//
			call.setTargetEndpointAddress(new URL(strEndPoint));
			//
			////////////////////////////////////////////////////////////////////
			// first parameter in QName seemingly takes ANYTHING
			call.setOperationName(new QName("http://www.meizlik.com", strFunctionName));
 
			////////////////////////////////////////////////////////////////////
			// Set the name of the parameter and the return type
			call.setReturnType(XMLType.XSD_STRING);
			call.addParameter(new QName("http://www.meizlik.com",strParamName1), XMLType.XSD_STRING, ParameterMode.IN);
			call.addParameter(new QName("http://www.meizlik.com",strParamName2), XMLType.XSD_STRING, ParameterMode.IN);
 
			//
			////////////////////////////////////////////////////////////////////
			// Catch the result and print it
			// Parameter count is now ONE (1).
			// call.setUseSOAPAction(true);//Not Necessary
			call.setSOAPActionURI(strSoapAction);//Yes Necessary
 
			String	strResult = (String) call.invoke(
				new Object[] {
					new String(strParameterVal1),
					new String(strParameterVal2)
					}
				);
 
			System.out.println("Result='" + strResult + "'");
		}
		catch (Exception e)
		{
			e.printStackTrace();
			System.err.println(e.toString());
		}
	}
}

                                              
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by: shivaspkPosted on 2008-07-16 at 18:57:33ID: 22021820

Oh i didn't see your above comment was busy debugging your stuff :)

Thank you.

 

by: TriskelionPosted on 2008-07-16 at 19:25:51ID: 31476824

YOU ROCK!!!
Thank you so much.

20120131-EE-VQP-002

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