Servlet life cycle

Servlet Life Cycle:
init()
service()
destroy()
§    container load the servlet class.
§    Container Instantiate servlet. It runs the constructor. The constructor is default one given by compiler.
§    Container calls the init() method after Servlet Instance is created. It will be called only once in servlet lifecycle, must complete before container call the service().
§    Then container call the service() method.
§    [...]

Read Full Post »

Web app Architecture

Container:
Container helps servlets.
It instantiate the servlet or make a thread to handle the request
It calls the servlet’s doGet() or doPost() method
It create HTTP request and response object to the servlet.
It manages the life cycle of servlet.
It finds the URL in DD to find the correct servlet for the request.
[...]

Read Full Post »