reapIntervalSeconds

60

Specifies the number of seconds between checks for expired sessions. This is also the interval at which sessions are passivated if maxSessions is exceeded.

To prevent data inconsistency, 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 the last few hits might be lost each time the server is restarted.

Applicable only if the persistence-type attribute of the parent session-manager element is file.

maxSessions

-1

Specifies the maximum number of sessions that are permitted in the cache, or -1 for no limit. After this, an attempt to create a new session causes an IllegalStateException to be thrown.

The session manager passivates sessions to the persistent store when this maximum is reached. 

Applicable only if the persistence-type attribute of the parent session-manager element is file.

sessionFilename

none; state is not preserved across restarts 

Specifies the absolute or relative path to the directory in which the session state is preserved between application restarts, if preserving the state is possible. A relative path is relative to the temporary directory for this web application. 

Applicable only if the persistence-type attribute of the parent session-manager element is memory.