The full form of EJB is Enterprise Java Bean. One of the Java APIs (application programming interfaces) for the Java Platform, Enterprise Edition (JEE), and enterprise applications is EJB. EJB is a flexible and manageably constructed Java API. Sun Microsystems can make the process of growing and expanding large, fixed, guaranteed, and scalable application components easier.
The main components of business processes are communicated via EJB, a server-side and platform-independent software element that is rigid, guaranteed, defined, multi-layer, and application programmes. It supports their efforts by enabling app developers to concentrate on their business operations.
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EJB Types
EJB is categorized into three types:
Entity bean
The preservation of the object constitutes EJB. It is a part of data that retains the information in the database.
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Session bean
A session bean is a non-persevering item; the customers’ business logic is implemented. Example: It can compute interest on deposits for a banking application.
Message-driven bean
It organizes concurrently occurring messages, so it is implemented in an asynchronous communication system such as formulating JMS messages.
EJB’s Requirement
- Data and services are spread over many sites.
- When the software must be adaptable and focused on productivity.
- Whenever a user requires the organisation of transactions, the EJB web framework can coordinate transaction restrictions.
- Whenever the application includes expressing the fundamental elements of business logic, there is a disjunction between presentation and business logic.
EJB usage
- In a Web-centric framework, the EJBs will include the business logic that rests behind the Web-oriented components, such as servlets & JSPs.
- EJBs can be used by thick client applications, such as Swing programmes, in a manner comparable to web-centric apps.
- EJBs could act as a bridge between company systems and the network technologies routinely used to disseminate business-to-business (B2B) e-commerce.
Benefits
- Free protection is provided to EJB access.
- Declarative payments are dispensed within the EJB.
- In EJBs, caching & pooling are also used to improve performance. EJB web containers execute life cycles with EJBs.
- In the EJB, remote access skills are accessible, and scalability is increasing.
- Programming is possible depending on the use of attributes or annotations.
- For unrestricted use, many complicated options are available.