When and How is a JSESSIONID Cookie Created and Used?

Conditions for JSESSIONID Creation

A JSESSIONID cookie is generated when a session is established, typically by invoking the request.getSession() or request.getSession(true) method for the first time in your code. Conversely, using request.getSession(false) retrieves an existing session or returns null if none exists, preventing the creation of a new session and the transmission of a JSESSIONID cookie.

Scope of JSESSIONIDs

Sessions are confined within the context of a web application, not spanning across applications deployed on the same domain. The Servlet 2.4 specification stipulates that HTTP session objects must be scoped at the application level and that the container must not share the referenced object or its attributes between contexts.

Implicit Session Creation

Calling a JSP page triggers the creation of a new session if one does not already exist. This behavior can be disabled by setting the session page directive to false, restricting access to session variables within the JSP page.

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