How does session tracking work in servlets?

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Session tracking in servlets is the mechanism used to maintain user-specific data across multiple requests, as HTTP is a stateless protocol. Each request from a client is independent, so the server needs a way to identify returning users and retain their data (like login info, preferences, cart items).

Common methods:

1. Cookies – The server sends a small text file (cookie) with a unique session ID to the client. The browser sends it back with each request, allowing the server to fetch session data.

2. URL Rewriting – The session ID is appended to the URL as a parameter (e.g., ?jsessionid=1234). Useful when cookies are disabled.

3. Hidden Form Fields – Session data is passed through hidden <input> fields in forms.

4. HTTPSession – Servlet API provides HttpSession to store/retrieve user data easily. The container generates a session ID and manages storage automatically.

Workflow:

• Client sends first request → Server creates session & assigns unique ID.

• Session ID is shared via cookies or URL rewriting.

• On subsequent requests, the ID identifies the user’s session until it expires or is invalidated.

This enables personalized, continuous interactions in web apps.

Read more: 

Difference between doGet() and doPost()

What is the Optional class used for?

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