Oracle Containers for J2EE (OC4J) is the core J2EE runtime component of Oracle Application Server. Being J2EE 1.4 compatible and running on standard J2SE distributions, OC4J maintains its heritage of being easy to use and highly productive for developers, while at the same time, offering outstanding performance and scalability for production environments. Oracle Containers for J2EE now provides full EJB 3.0 support, JPA based on TopLink Essentials and annotations support in the web and application client container.
Oracle Containers for J2EE 10.1.3.3 is Now Available Now with EJB 3.0/JPA support
The Oracle Enterprise Messaging Service (OEMS) is a standards based solution built on the Java Message Service (JMS) and the J2EE Connector Architecture (J2CA) which allows customers to develop and integrate distributed applications.