Java:Why http session is not destroyed when tab or browser is closed?

Question

I have the following implementation of HttpSessionlistener

public class SessionListener implements HttpSessionAttributeListener, HttpSessionListener {


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Answer 1

How would the server know when the browser is closed or the tab closed? At that point the browser doesn't send anything to the server.

This is a fundamental part of HTTP - it's a request/response protocol, not a "permanently open conversation" where you can tell if one party leaves the conversation. Think of it as a series of telegrams rather than a phone call - and you can't tell when you've received the last telegram you're going to get.

You'll need to design your way round this - to avoid needing to know when the browser has been closed. There are some ugly hacks to work around it - making AJAX poll the server with a heartbeat message, for example - but changing the design is a better solution.