Explain the life cycle of a Servlet.

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Aryan Kumar · Answer

The life cycle of a servlet describes the various stages that a servlet goes through, from its instantiation to its destruction. Understanding the servlet life cycle is crucial for developing effective and efficient web applications. Here are the key stages in the life cycle of a servlet:

Instantiation:

When a web server starts or when a servlet is first accessed, the servlet container (e.g., Tomcat) creates an instance of the servlet class by calling its default constructor.
The init method is then invoked to perform any one-time initialization tasks.

Initialization:

The init method is called once during the servlet's life cycle.
It is used to perform any initialization tasks, such as setting up database connections, loading configuration parameters, or preparing resources needed by the servlet.

Request Handling:

The servlet is now ready to handle client requests.
The service method is called by the servlet container for each incoming request.
The service method, in turn, dispatches the request to the appropriate doXXX method based on the HTTP method (e.g., doGet for GET requests, doPost for POST requests).

Request Handling (doXXX Methods):

The doXXX methods (e.g., doGet, doPost) contain the actual logic for processing client requests.
Developers override these methods to implement the specific functionality of the servlet.

Destruction:

When the servlet container decides to take the servlet out of service (e.g., during server shutdown), the destroy method is called.
The destroy method allows the servlet to release any resources it acquired during its life cycle.

Garbage Collection:

After the destroy method is called, the servlet instance becomes eligible for garbage collection.
The Java Virtual Machine (JVM) will eventually reclaim the memory occupied by the servlet instance.

In summary, the life cycle of a servlet involves instantiation, initialization, handling client requests, destruction, and eventual garbage collection. The servlet container manages these stages to ensure the proper functioning and resource management of servlets in a web application.

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Explain the life cycle of a Servlet.

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