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== session



=== Purpose


The link:{servletApiRefFromRef}session.html[session] object is an instance of the Servlet API's {jakartaee}jakarta/servlet/http/HttpSession.html[HttpSession] class.


=== Examples


[source,groovy]
----
class UserController {

    def logout() {
        log.info "User agent: " + request.getHeader("User-Agent")
        session.invalidate()
        redirect(action: "login")
    }

    def login() {}
}
----


=== Description


The {jakartaee}jakarta/servlet/http/HttpSession.html[HttpSession] class is useful for associated session data with a client.

NOTE: The additional methods added to the link:{servletApiRefFromRef}session.html[session] object are documented in the Grails Servlet API reference guide
