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If you are wondering what EJB is, then you have landed at the right place. EJB stands for Enterprise Java beans. It is one of the several Java APIs for standard manufacture of enterprise software. In this tutorial, you will get a complete insight on this topic.
The agenda for this article is mentioned below:
EJB is server-side software that helps to summarizes the business logic of a certain application. EJB was provided by sun micro-systems in order to develop robust, secure applications. The EJB enumeration is a subset of the Java EE enumeration. Enterprise Java beans managers concerns such as endurance security transnational property that would leave the programmers in a position to focus more on parts of the enterprise software at hand.
Whenever you have to run an EJB application, an application server is needed, for example, Glass-fish, Web-logic, Web-sphere etc. The functions it performs are as follows:
There are several types of enterprise Java beans. The list can be seen below:
Session beans: these are non-persistent enterprise beans. There are two kinds of session beans:
Stateful: a stateful session Bean maintains client-specific session information across several transactions. It exists for the duration of a single client/server session.
Stateless: a stateless session bean is an old bye their container so that they can easily handle several requests from clients.
Entity beans: These beans contain persistent data and it can be saved in the data source. There are two types:
Message-driven beans: Message-driven beans are enterprise beans that receive and process Java message service messages. They can be accessed only through messaging. They do not have interfaces. Asynchronous communication between the queue and the listener takes place.
There are certain cases when you can use enterprise Java beans. Have a look:
I have mentioned a few advantages of EJB which are as follows:
Here is a list showcasing the disadvantages of enterprise Java beans:
With this, we come to the end of this EJB in Java article. I hope you have understood what is EJB in Java and how to implement it.
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