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The specification describes how an EJB interacts with its container and how client code interacts with the container/EJB combination. The EJB classes used by applications are included in the javax.ejb package. (The javax.ejb.spi package is a service provider interface used only by EJB container implementations.)
An "Entity Bean" is a type of Enterprise JavaBean, a server-side Java EE component, that represents persistent data maintained in a database.An entity bean can manage its own persistence (Bean managed persistence) or can delegate this function to its EJB Container (Container managed persistence).
OpenEJB is an open-source, embeddable and lightweight Enterprise JavaBeans Container System and EJB Server, released under the Apache License 2.0. OpenEJB has been integrated with Java EE application servers such as Geronimo [1] and WebObjects. [2]
Jakarta Contexts and Dependency Injection (CDI) is a specification to provide a dependency injection container; Jakarta Enterprise Beans (EJB) specification defines a set of lightweight APIs that an object container (the EJB container) will support in order to provide transactions (using JTA), remote procedure calls (using RMI or RMI-IIOP ...
Apache TomEE (pronounced "Tommy") is the Enterprise Edition of Apache Tomcat (Tomcat + Java/Jakarta EE = TomEE) that combines several Java enterprise projects including Apache OpenEJB, Apache OpenWebBeans, Apache OpenJPA, Apache MyFaces and others. [3]
EasyBeans is an open-source Enterprise JavaBeans container hosted by the OW2 Consortium. The License used by EasyBeans is the LGPL. EasyBeans is the EJB 3.0 container of the JOnAS application server. EasyBeans is integrated in the JOnAS application server Java EE 5 certified application server.
EJB container: Enterprise Beans are used to manage transactions. According to the Java BluePrints , the business logic of an application resides in Enterprise Beans —a modular server component providing many features, including declarative transaction management, and improving application scalability .
(The underlying interaction between the EJB Server and the TM is transparent to the application; the burden of implementing transaction management is on the EJB container and server provider. [1]) The code sample below illustrates the usage of UserTransaction via bean-managed transactions in an EJB session bean: