which class is implementing the RequestDispatcher interface

[ramchander yshetti]

hai
please tell me which class is implementing the RequestDispatcher interface
interface RequestDispatcher
{
----
}
class ?? implements RequestDispatcher
{
-------
}

2.Q) the service() method is compulsory required ServletException and IOException

ex: public void service(HttpServletRequest request,HttpServletResponse response) throws IOException

while writing the above service() method i am able to run the servlet program. I am getting the output with out writing the ServletException.

please clear me.

[David O'Meara]

These are basic Java questions, not so much Servlet questions.

[Ben Souther]

1.) The container you are using will pass you an instance of RequestDispatcher when you call either
http://java.sun.com/j2ee/1.4/docs/api/javax/servlet/ServletContext.html#getRequestDispatcher(java.lang.String)
or
http://java.sun.com/j2ee/1.4/docs/api/javax/servlet/ServletRequest.html#getRequestDispatcher(java.lang.String)

You don't really need to concern yourself with the actual class. You nust need to know that it implements RequestDispatcher.
If you're curious about the class name and you want to see it, the following code, will print it to stdout.

 
RequestDispatcher requestDispatcher = request.getRequestDispatcher('somePage');
System.out.println("CLASS = " requestDispatcher.getName());

[Ben Souther]

2.) As David mentioned, exception handling and inheritance are not servlet specific questions. I'll let someone else answer that but....

It is worth mentioning that overriding the service method in a servlet is not a good practice. Rather, you should override the methods for the specific request type that you want your servlet to handle. This usually means doGet and/or doPost.