RE: SOAP getValue() returns NULL

[Liam DeMasi]

I tried integrating the code below that you suggested, but my compiler isn't recognizing Hashtable ("cannot resolve symbol").

As to your question about where the NPE occurs: It is occuring when I reference the return value. But I don't know for sure that the line that does the result.getValue() line is working properly also.
Below is the code for my client.


package mypackage.io;

import java.net.*;
import org.apache.soap.*;
import org.apache.soap.rpc.*;

public class GetCountApp {
        public static void main(String[] args) throws Exception
        {
                URL url = "" URL("http://localhost:8080/soap/servlet/rpcrouter");
                Call call = new Call();
                call.setTargetObjectURI("urn:CallCounterService");
                call.setMethodName("getCount");
               
                try
                        {
                                Response resp = call.invoke(url, "");
                                Parameter ret = resp.getReturnValue();
                                Object value = ret.getValue(); <-- This is the line that is returning the NPE
                                System.out.println("Result is " + value);
                        }
                catch (SOAPException e)
                        {
                                System.err.println("Caught SOAPException (" + e.getFaultCode() + "): " + e.getMessage());
                        }
        }
}
               

-----Original Message-----
From: Scott Nichol [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, August 05, 2003 2:21 PM
To: [EMAIL PROTECTED]
Subject: Re: SOAP getValue() returns NULL


Handling the return from a call is typically done like:


        // Invoke the call and handle the response.
        Response resp = call.invoke(url, "");
        if (resp.generatedFault()) {
            Fault fault = resp.getFault();
            System.err.println("Generated fault: " + fault);
        } else {
            Parameter result = resp.getReturnValue();
            Hashtable hash = (Hashtable) result.getValue();
            System.out.println("keys: " + hash.get("keys"));
            System.out.println("values: " + hash.get("values"));
        }
Does your NPE occur on the line where you do result.getValue(), or does it occur when you reference the return value, e.g. the hash.get() call in the above code?After reading the code, your next step in debugging is typically to run TcpTunnelGui provided with Apache SOAP to capture the messages between the endpoints.  I don't recall what the docs look like for TcpTunnelGui, but http://www.scottnichol.com/basicapachesoapcoding.htm gives a very basic example of using it.Scott Nichol

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----- Original Message -----
From: "Liam DeMasi" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, August 05, 2003 1:56 PM
Subject: SOAP getValue() returns NULL


> I am having a problem with a simple service and client that I have created.
> The server and client are both on the same Linux machine.
>
> The service keeps track of the number of method calls it receives from the
> client and returns that value. Or at least it should. The problem I am
> having is that when I run the client, I get that the Parameter class
> getValue() is returning null from the service. The exact error message that
> I receive is "Exception in thread 'main' java.lang.NullPointerException at
> mypackage.io.Program_Name"
>
> Can you give me any tips on what this problem might be? This is my first
> attempt at SOAP.
>
> thank you.
>
> Liam A. DeMasi
> Atlantic Consulting Services, Inc.
> 167 Ave at the Commons, Suite 4
> Shrewsbury, NJ 07702
> (732) 460-9416 x15
> (732) 460-9419 (FAX)
> [EMAIL PROTECTED]
>
>
>