Servlet container model

• Servlets are pure java code 
• JSP contains HTML and small amount of java code 
• Browser sends the request to the webserver 
• Webserver hands the request to the servlet container 
• Webserver checks the type of request 
• If the request is coming from jsp it will be translated to servlet in the container 
• Container loads the servlets if not already loaded 
• Container hands the request object to init() ,the service() and last the destroy()
• service() calles the appropriate doXXX() 
• Container creates the HTTP response 
• If Http response is fine it will send the http response or error response.