For example, Application Server Enterprise Edition enhances the core application server platform with high availability, load balancing and cluster management capabilities. The management capabilities of the Platform Edition are extended in Enterprise Edition to account for multi-instance and multi-machine deployments.
Application Server’s clustering support includes easy-to-configure groups of cloned application server instances to which client requests can be load balanced. Both external load balancers and load balancing web tier-based proxies are supported by this edition. Application Server EE provides failover for HTTP sessions and stateful session beans using the highly available database (HADB).
See the Application Server Enterprise Edition 8.2 documentation for more information: