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Web Application session replication is enabled in a clustered environment from WSO2 Application Server 5.0.0. Therefore, when a Web application is defined as "distributable" and once a session is created for it from a node, that session gets replicated to other nodes as well. The subsequent changes in the session from any node will also get replicated to other nodes. The same session replication mechanism from Tomcat ( ) is used here, except for the Axis2 Tribes Framework used to send the session replication messages across the cluster.