In the last version of Jigsaw , you have many properties to configure. Value is specified in milliseconds. Max number of sessions in memory, if the number of sessions exceeds this number the sessions with the bigest idle time will be invalidated. This is checked each time a session is added. Time interval when Jigsaw checks for sessions that have gone unused long enough to be invalidated.
Value is an integer, specifying the interval in milliseconds.
Jigsaw use a local ClassLoader to load servlet classes from the servlet Directory. If a servlet class is modified when Jigsaw is running, the ClassLoader load automatically the new class. It's a very useful feature for servlets developers. In those versions there is a auto-reload flag in ServletWrapper. Now this problem has been resolved and we don't need the auto-reload flag anymore.