You may want to specify StandardManager explicitly to change its default parameters. To do so, edit the sun-web.xml file for the web application as in the following example. Note that persistence-type must be set to memory.
<sun-web-app> ... <session-config> <session-manager persistence-type=”memory”> <manager-properties> <property name="reapIntervalSeconds" value="20" > </manager-properties> </session-manager> ... </session-config> ... </sun-web-app>
For more information about the sun-web.xml file, Chapter 7, Deploying Web Applications.