How do I get a list of all HttpSession objects in a web application?

java servlets web-applications httpsession

Solution 1:

No, the Servlet API doesn't provide a way. You really have to get hold of them all with help of a HttpSessionListener. You can find several examples in the following answers:

  • How to find HttpSession by jsessionid?
  • How to find number of active sessions per IP?
  • How to check Who's Online?
  • How to invalidate another session when a user is logged in twice?

Solution 2:

There is no straight forward way. It depends on deployment. Above will fail once you decide to introduce distributed deployment and load balancing.

Solution 3:

Not really an answer, but in the good ol' days there was "javax.servlet.http.HttpSessionContext", but it was dropped as of version 2.1, explicitly with no replacement: https://tomcat.apache.org/tomcat-5.5-doc/servletapi/javax/servlet/http/HttpSessionContext.html

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