directory

domain-dir/generated/jsp/j2ee-apps/appname/appname_war

(optional) Specifies the absolute or relative pathname of the directory into which individual session files are written. A relative path is relative to the temporary work directory for this web application. 

reap-interval-in-seconds

60

(optional) Specifies the time between checks for expired sessions. 

Set this value lower than the frequency at which session data changes. For example, this value should be as low as possible (1 second) for a hit counter servlet on a frequently accessed web site, or you could lose the last few hits each time you restart the server.