INTERVIEW QUESTIONS J2EE SERVLET DETAILS

Question: How the server will know (i.e) when it can invoke init, service,destroy methods of servlet life cycle?

Answer: When a request for a servlet is made the container will check for the servlet instance 1. If an instance of the servlet does not exist, the web container 1. Loads the servlet class. 2. Creates an instance of the servlet class. 3. Initializes the servlet instance by calling the init() method. 2. Invokes the service() method, passing request and response objects. 3. If the container needs to remove the servlet, it finalizes the servlet by calling the servlet's destroy() method.

When a request for a servlet is made the container will check for the servlet instance 1. If an instance of the servlet does not exist, the web container 1. Loads the servlet class. 2. Creates an instance of the servlet class. 3. Initializes the servlet instance by calling the init() method. 2. Invokes the service() method, passing request and response objects. 3. If the container needs to remove the servlet, it finalizes the servlet by calling the servlet's destroy() method. Source: CoolInterview.com

In brief only container will decide when call servlet life cycle method. Source: CoolInterview.com

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