Does Oracle9iAS provide clustering support?
OC4J fully supports clustered configurations for stateful Java based Web applications. In a clustered environment, the J2EE container replicates Serializable data contained in HttpSession and ServletContext objects to other servers which are specified as belonging to the same cluster-island. A cluster-island is a definition of a set of servers on which the state of applications will be replicated. Using this approach, application state is only shared on servers defined within the same cluster-island. This enables you to provide stateful Web application failover to another server, without being forced to replicate web application state to all of the other servers within your deployment environment. OC4J does not require a homogenous application server environment to implement clustering and does not depend on any hardware or operating system provided functionality. The clustering capabilties are implemented within OC4J and can be used across application server instances running on diffe
