How container handles the Servlet request

Author posted by Jitendra on Posted on under category Categories Servlet and tagged as Tags with 4 Comments on How container handles the Servlet request

How container handles the Servlet request or How the apache Tomcat works

1. User clicks a link that has a URL of Servlet.

Client Browse Servlet URL
Client Browse Servlet URL

2. Container (Apache Tomcat is one of the example) sees that the request is for servlet , so create two objects :
HttpServletRequest
HttpServletResponse

HttpServletRequest and HttpServletResponse
HttpServletRequest and HttpServletResponse

3. Container finds correct servlet on the basis of URL passed with the help deployment descriptor (web.xml) file. Creates / Allocate thread for that request and pass request and response object to servle thread.

Create Thread for Servlet
Create Thread for Servlet

4. Container calls the servlets service() method, on the type of request, service calls doGet() or doPost() methods.

Service method of servlet
Service method of servlet

5. Lets assume that service calls the doPost() method. doPost() method generates dynamic page and add the page in response object.

Servlet - doPost  - response object
Servlet - doPost - response object

6. Thread completes, container converts the response object into HttpResponse object and destroys the response and request object.

destroy response and request object
destroy response and request object

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  • Miranda

    appreciate the work. really helps

  • Azhar

    Nice presentation.
    I have few doubts regarding the http requests handled by tomcat.
    say I’m client, I make http request and suddenly close connection when our code is run still. what will happen to the request.How to handle transaction if i have to roll back entire transaction.Have any Idea on how tomcat handles the request, tomcat keeps all in memory.
    If I have a broken request and nobody is listining to it , how the situation is handled.

  • Sachin Kale

    Nice Article.