You can specify file 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 file.
<sun-web-app> ... <session-config> <session-manager persistence-type=”file”> <manager-properties> <property name=reapIntervalSeconds value=20 /> </manager-properties> <store-properties> <property name=directory value=sessions /> </store-properties> </session-manager> ... </session-config> ... </sun-web-app>
For more information about the sun-web.xml file, see Chapter 9, Deploying Web Applications.