Explain the lifecycle of a Java Servlet.

 

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Explain the lifecycle of a Java Servlet.

The lifecycle of a Java Servlet is managed by the servlet container and consists of three key phases: initialization, servicing requests, and termination. Here's an explanation of each phase:

1. Initialization Phase (init)
When a servlet is first loaded into memory, the container calls the init() method to initialize the servlet.

The init() method is called once during the servlet's lifecycle, and it performs tasks such as:

Allocating resources.

Reading configuration parameters.

Performing startup logic.

After initialization, the servlet is ready to process client requests.

2. Request Handling Phase (service)
Once the servlet is initialized, the container calls the service() method to handle client requests.

The service() method determines the request type (GET, POST, etc.) and delegates the request to corresponding HTTP-specific methods like doGet(), doPost(), doPut(), or doDelete().

This phase is where the majority of servlet logic occurs—processing requests, generating responses, and interacting with databases or other systems.

3. Termination Phase (destroy)
When the servlet is no longer needed (e.g., the container shuts down or the servlet is explicitly unloaded), the container calls the destroy() method.

The destroy() method performs cleanup tasks, such as:

Releasing resources (e.g., database connections, file handles).

Saving any necessary state.

After the destroy() method is executed, the servlet is removed from memory and cannot process any more requests.

Lifecycle Methods in a Servlet
init(): Called once when the servlet is loaded.

service(): Called each time a request is received.

destroy(): Called once before the servlet is unloaded.

The servlet lifecycle ensures efficient resource management and provides developers with hooks to implement custom logic at each phase. 

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