Calling a web service from JSP

[Kirth]

I am doing a project on RESTful web services on Google App Engine
(Java) in Netbeans IDE. The problem is, after creating a RESTful web
service in Netbeans, error comes while attempting to test the service
using the option TEST RESTFUL WEB SERVICES. I get ERROR 400 or ERROR
500.
The HTTP Error 500 says like this:
"Need to specify class name in environment or system property, or as
an applet parameter or in an application resource file:
java.naming.factory.initial"

I have created RESTful web service from a newly created database. Now,
when I run the project, the JSP page I have created appears on the
browser. But, I need to know WHAT THE CODE IS to CONNECT THE JSP page
with the Service. Meaning, how can I call the web service from the JSP
page or how do I connect the JSP page and the WEB SERVICE.

For example, if I click on the SUBMIT button on the JSP output page on
the browser, the details that I have entered on in the browser page
must contact the HTTP Methods of the RESTful web service and update in
the database correspondingly. So, is there any tutorial or any
specific code to be inserted so that my project works flawlessly?

URGENT!!! PLS HELP...

[midi]

Pls post the code that is used for calling the URI.

Maly
http://servetube.appspot.com