Answer Posted / sanjeev kumar

When ever a http client request is sumbitted servlet engine
will received this request and it identifies the proper
servlet to handle this request from web.xml and calls the
public service method of the perticular servlet. Internally
this public service will call the private service method
and private service method will call the doGet() or doPost
() method based on the client request. This public void
service(HttpServletRequest request, HttpServletResponse
response) will be called once per the request.

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