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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).
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 ...
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 .
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 .
Support for the EJB 3.0 technology and support for some webservices standards were provided by the EJB feature pack and the webservices feature packs, respectively. These function in these feature packs has been folded into the main product in version 7. Functions in the webservices feature pack include:
The EJB 3.0 specification (itself part of the Java EE 5 platform) included a definition of the Java Persistence API. However, developers do not need an EJB container or a Java EE application server to run applications that use this persistence API. [4]
It aims to provide an EJB 3.0 container as specified in the Java Platform Enterprise Edition (Java EE) in its fifth version. It means that Session beans (Stateless or Stateful), Message Driven Beans (MDB) are available on EasyBeans. Open JPA is only the persistence API for EJB 3.0, at the same level as Hibernate.