ejb3

EJB Deployment Descriptor Example

1. Introduction Deployment descriptor is the file which tells the EJB server that which classes make up the bean implementation, the home interface and the remote interface. it also indicates the behaviour of one EJB with other. The deployment descriptor is generally called as ejb-jar.xml and is in the directory META-INF of the client application. This is the main deployment ...

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EJB Life Cycle Example

1. The LifeCycle of EJB The various stages through which an enterprise bean go through its lifetime is known as the life cycle of EJB. Each type of enterprise bean (stateful session, stateless session, singleton session, or message-driven) has a different lifecycle. 2. Life Cycle of a Stateful Session Bean The following figure shows the life cycle of a stateful ...

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EJB Tutorial for Beginners with Example

1. Introduction The Enterprise Java Beans (EJB) is a specification for deployable server-side components in Java. It is an agreement between components and application servers that enable any component to run in any application server. EJB components (called enterprise beans) are deployable, and can be imported and loaded into an application server, which hosts those components to develop secured, robust and ...

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EJB Transaction Management Example

1. Introduction Transactions free the application programmer from dealing with the complex issues of failure recovery and multi-user programming. The transactional system ensures that a unit of work either fully completes, or the work is fully rolled back. 2. Transaction Management Type in EJB The Enterprise Bean Provider and the client application programmer are not exposed to the complexity of ...

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EJB Tutorial for Beginners

1. Introduction Enterprise Java Beans (EJB) is a development architecture for building highly scalable and robust enterprise level applications to be deployed on JEE compliant Application Server such as JBOSS, Web Logic etc. This tutorial explains basics about EJB3 and shows a simple work through to set up a EJB3 project, create a entity bean and a session bean. EJB are ...

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EJB Interceptors Example

1. Introduction This is an example of how to use the javax.interceptor.* in an EJB. Interceptors are used, as the name suggests, to intercept ejb methods calls using methods annotated with interceptor annotation (@AroundInvoke , @AroundTimeout , @PostConstruct etc ). An interceptor method is called by Ejb Container before ejb method call it is intercepting. The Interceptors specification defines two ...

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EJB Timer Service Example

1. Introduction In this example we will show how to use EJB Timer Service . The EJB timer service is a container-provided service that allows the Bean Provider to register enterprise beans for timer callbacks to occur according to a calendar-based schedule, at a specified time, or at specified intervals. 2. Create a new EJB Module Open NetBeans IDE, choose ...

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Expose EJB as a Web Service

With this example we are going to demonstrate how to expose an EJB as a web service. Enterprise beans are Java EE components that implement Enterprise JavaBeans (EJB) technology. Enterprise beans run in the EJB container, a runtime environment within the Application Server (see Container Types). Although transparent to the application developer, the EJB container provides system-level services such as ...

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Reference EJB in another EJB of different applications

This is an example of how to create a reference of an EJB in another EJB of different applications. Enterprise beans are Java EE components that implement Enterprise JavaBeans (EJB) technology. Enterprise beans run in the EJB container, a runtime environment within the Application Server (see Container Types). Although transparent to the application developer, the EJB container provides system-level services ...

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Reference EJB in another EJB of the same application

In this example we shall show you how to get a reference of an EJB in another EJB of the same application. Enterprise beans are Java EE components that implement Enterprise JavaBeans (EJB) technology. Enterprise beans run in the EJB container, a runtime environment within the Application Server (see Container Types). Although transparent to the application developer, the EJB container ...

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