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A cluster maintains copies of application components (objects), so if a component becomes unavailable, the cluster uses the failed object's copy to complete the processing of the task. WebLogic Server uses session replication to fail over servlets and JSP. Similarly, it uses replica-aware stubs to maintain information about the state of application components such as EJBs and RMIs. Replication allows the copies of the failed objects to finish the job when an application component fails.