The Oracle Application Server 10g (the “g” stands for grid) (short Oracle AS), consists of an integrated, standards-based software platform.
It forms part of Oracle Corporation’s Fusion Middleware technology stack.
The heart of Oracle Application Server consists of Oracle HTTP Server (based on Apache HTTP Server) and OC4J (OracleAS Containers for Java EE) which deploys Java EE-based applications.
The latest version of OC4J offers full compatibility with the Java EE 1.4 specifications.
Oracle Application Server became the first platform designed for grid computing as well as with full life-cycle support for service-oriented architecture (SOA).
The current release of Oracle Application Server, 10g R3, does not feature a metadata repository tier, relying instead on metadata repositories provided in previous releases.
Following Oracle’s acquisition of BEA Systems: “key features [will be] integrated with WebLogic Server with seamless migration”.