Request Lifecycle in Struts 2 applications

Request Lifecycle in Struts 2 applications

1.User Sends request: User sends a request to the server for some resource.
 
2.FilterDispatcher determines the appropriate action: The FilterDispatcher looks at the request and then determines the appropriate Action.
 
3.Interceptors are applied: Interceptors configured for applying the common functionalities such as workflow, validation, file upload etc. are automatically applied to the request.
 
4.Execution of Action: Then the action method is executed to perform the database related operations like storing or retrieving data from the database.
 
5.Output rendering: Then the Result renders the output.
 
6.Return of Request: Then the request returns through the interceptors in the reverse order. The returning request allows us to perform the clean-up or additional processing.
 
7.Display the result to user: Finally the control is returned to the servlet container, which sends the output to the user browser.
Image: Struts 2 high level overview of request processing:

These all are the step's ,that follow in struts2 application.