WebLogic is a complex, professional application server environment with a complex and powerful security environment. WebLogic server at its core implements the J2EE specification stack and its main purpose is to offer a hosting environment for J2EE applications. But WebLogic is much more than that. Like most professional J2EE server WebLogic also offers a large number of extended features like comprehensive management, clustering and failover functionality on different levels, plus a number of extended enterprise features not required by J2EE but very useful in the enterprise world, enterprise features that are required by many companies.