EJB2 TUTORIAL PDF

Vudobei Stateless3Bean also exposes a business-remote interface, so that the org. Make sure the AS is not running. To create the local home interface, extend javax. This will bring up a page where you can click on the Test button to check that the EJB2. EJBLocalObject for the local interface. You may need to download Eclipse and Java JDK and get them installed on your machine regardless your operating system Windows or Linux.

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EJB application is deployed on the server, so it is called server side component also. When use Enterprise Java Bean? Application needs Remote Access. In other words, it is distributed. Application needs to be scalable. EJB applications supports load balancing, clustering and fail-over. Application needs encapsulated business logic. EJB application is separated from presentation and persistent layer. Types of Enterprise Java Bean There are 3 types of enterprise bean in java.

Session Bean Session bean contains business logic that can be invoked by local, remote or webservice client. Message Driven Bean Like Session Bean, it contains the business logic but it is invoked by passing message. Entity Bean It encapsulates the state that can be persisted in the database.

It is deprecated. RMI is not a server-side component. It is not required to be deployed on the server. EJB is a server-side component, it is required to be deployed on the server. RMI is built on the top of socket programming. If bean client need to be written in other language such as.

So EJB with web service will be better option. Disadvantages of EJB Requires only java client. For other language client, you need to go for webservice.

Complex to understand and develop ejb applications.

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