How and When Are JSESSIONIDs Created Across Multiple Applications in a Domain?

Session Lifecycle and JSESSIONID Creation

When does a JSESSIONID get created, and how does it relate to multiple applications within a domain?

Session Creation

A JSESSIONID cookie is generated when a session is established. This occurs when the code executes request.getSession() or request.getSession(true) for the first time. It's worth noting that request.getSession(false) only retrieves an existing session, avoiding session creation and JSESSIONID transmission.

Session Scope

Sessions are scoped at the application (or servlet context) level. Therefore, multiple applications deployed under the same domain will have distinct JSESSIONID cookies.

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