This graphic compares the clustering features of OC4J and Oracle WebLogic Server. On the left is a Oracle Application Server 10g Release 3 (10.1.3) cluster topology, consisting of two application server instances that are identical. The instances are managed from the Cluster Topology page in the active Fusion Middleware Control.
Both application server instances contain an Oracle HTTP Server instance and an OC4J instance. The two OC4J instances are configured as a single OC4J group.
On the left, a series of boxes represent a single Oracle WebLogic Server domain, which consists of four servers: an administration server and three managed servers. Two of the managed servers are configured as an Oracle WebLogic Server cluster, similar to the way the two OC4J instances were configured a single OC4J group.