Application Failover and Replication
WebLogic Server offers failover capabilities when an application component such as an EJB or servlet fails during the processing of a task. Since a cluster maintains a cluster-wide JNDI tree that provides information about the availability and location of all clustered objects, WebLogic Server uses a copy of the failed object located on a different server to complete the processing that was left incomplete due to the component failure. Making use of an alternate copy of a failed object is called application failover. How does WebLogic Server know the state of the job that failed? It uses two types of replication techniques to identify the state of the incomplete job—session replication for servlets and JSPs, ...
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