0 Resource redundancy (EJB database, JMS resource, LDAP)

EJB failover relies on data and resource availability. If the data and resources are unavailable, the EJB client request will fail. For example, if the queue manager fails and the queue has no message(s) for MDB to process, the client will fail. If the database fails, the entity bean cannot complete the transaction, and the EJB client will fail. We discuss high availability of all these in the following sections.

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