A TreeCache is a tree-structured, replicated, transactional cache from JBoss Cache. TreeCache is the backbone for many fundamental JBoss Application Server clustering services, including - in certain versions - clustering JNDI, HTTP and EJB sessions, and clustering JMS.

In addition to this, TreeCache can be used as a standalone transactional and replicated cache or even an object oriented data store, may be embedded in other J2EE compliant application servers such as BEA WebLogic or IBM WebSphere, servlet containers such as Tomcat, or even in Java applications that do not run from within an application server.