To enable and configure availability for an individual web application, edit the application deployment descriptor file, sun-web.xml. The settings in an application’s deployment descriptor override the web container’s availability settings.
The session-manager element’s persistence-type attribute determines the type of session persistence an application uses. It must be set to ha to enable high availability session persistence.
For more information about the sun-web.xml file, see The sun-web.xml File in Sun Java System Application Server Enterprise Edition 8.1 2005Q2 Developer’s Guide.
<sun-web-app> ... <session-config> <session-manager persistence-type=ha> <manager-properties> <property name=persistenceFrequency value=web-method /> </manager-properties> <store-properties> <property name=persistenceScope value=session /> </store-properties> </session-manager> ... </session-config> ...