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]
>
>
>
