Entity Bean

Definition of Entity Bean

An Entity Bean is a server-side component in Enterprise JavaBeans (EJB), a Java-based technology for building enterprise-level applications. It represents a business object that exists in a persistent storage system, such as a database, and persists across multiple application sessions. Entity Beans manage interactions with the underlying data source, providing an object-oriented interface for data manipulation and business logic.


The phonetic pronunciation of the keyword “Entity Bean” would be:ɛnˈtɪti bin

Key Takeaways

  1. Entity Beans are server-side components in Enterprise JavaBeans (EJB) that represent business objects and encapsulate their persistent data, providing a means of storing and retrieving data from a database.
  2. Entity Beans come in two types: Bean-Managed Persistence (BMP) and Container-Managed Persistence (CMP). BMP allows the developer to have complete control over the interactions with the database, while CMP allows the EJB container to manage most aspects of data persistence.
  3. Entity Beans offer numerous advantages, including transaction support, object caching, and the ability to interact with other EJB components like Session Beans, enabling developers to create scalable and reusable enterprise applications.

Importance of Entity Bean

The term “Entity Bean” is important in the realm of technology because it represents a crucial component in Enterprise JavaBeans (EJB), a server-side software architecture built on the Java platform.

Entity Beans facilitate the development of scalable, robust, and transaction-aware enterprise-level applications by encapsulating the business objects’ state and behavior in a reusable and portable form.

They can map directly to an underlying data source, such as a database, allowing for seamless persistence and retrieval of data.

This efficient representation of data models not only promotes object-relational mapping, but also encourages complex operations and logic to be performed on the server-side, leading to improved performance, enhanced security, and easier maintenance.

Overall, Entity Beans play a vital role in simplifying and streamlining the creation of dependable and scalable enterprise applications.


Entity beans serve as an essential component in Java-based web applications, specifically within the Enterprise JavaBeans (EJB) architecture. The primary purpose of an entity bean is to facilitate object-relational mapping (ORM), which essentially translates an object’s data and relationships to its corresponding relational database representation. In other words, entity beans bridge the gap between the object-oriented programming world and the relational database systems.

They are designed to represent and store the persistent state of an object in a database, helping developers build a clean, logical, and efficient representation of data storage when working on complex applications. Efficient data manipulation and retrieval, as well as transactional support, play critical roles in successful web-based applications. Entity beans, with their robust built-in capabilities, help achieve this by providing a well-organized connection between the application’s business logic and the underlying persistence layer.

This offers a higher level of abstraction while working with databases, eliminating the need for developers to write detailed SQL queries to query the database directly. With the use of entity beans, developers can primarily focus on designing business logic rather than intricate, low-level persistence operations. Moreover, entity beans simplify the overall development process and enhance maintainability by centralizing access to data within the application.

Examples of Entity Bean

Online Banking System: In an online banking system, Entity Beans can be utilized to represent the various components and data within the system, such as bank accounts, transactions, and customers. Each of these components can be mapped to a unique Entity Bean, allowing the system to store data related to these entities and enable users to perform operations like viewing account details, transferring funds, and managing their personal information.

E-commerce Platform: Entity Beans can play a crucial role in the development of an e-commerce platform by representing various entities like products, customers, orders, and vendors. For example, a Product Entity Bean can store all the relevant details of a product, such as its name, price, category, and description. Similarly, a Customer Entity Bean can store customer information like name, address, and purchase history. By encapsulating this data in Entity Beans, the platform can efficiently manage and organize data as well as streamline the operations related to inventory management, order processing, and customer support.

Library Management System: In a library management system, Entity Beans can represent entities like books, authors, library members, and transactions (borrowing and returning books). Each of these entities can have their respective Entity Beans to store relevant data—for instance, a Book Entity Bean can hold information like title, author, publisher, and availability status. Using these Entity Beans, the library management system can efficiently manage data related to book inventory, member registration, and borrowing/returning transactions, improving the overall functioning and user experience of the system.

Entity Bean FAQ

What is an Entity Bean?

An Entity Bean is a server-side component in Enterprise JavaBeans (EJB) technology that represents a business object in a persistent storage mechanism, such as a database. The primary function of Entity Beans is to encapsulate the business logic and to provide a way to manage the data access related to the underlying business objects.

What are the types of Entity Beans?

There are two types of Entity Beans: Bean-Managed Persistence (BMP) and Container-Managed Persistence (CMP). BMP Entity Beans require developers to write code for the data access operations, while CMP Entity Beans allow the EJB container to generate and manage the data access code automatically.

What is the difference between Bean-Managed Persistence (BMP) and Container-Managed Persistence (CMP)?

The main difference between BMP and CMP is in the way data access operations are handled. In BMP, the developer is responsible for writing the data access code and managing the database connections, transactions, and query execution. In CMP, the EJB container takes care of generating the necessary data access code and manages database operations, allowing the developer to focus on the business logic.

How does an Entity Bean interact with a database?

An Entity Bean interacts with a database using either Bean-Managed Persistence (BMP) or Container-Managed Persistence (CMP). In BMP, the developer writes database access code, manages database connections and transactions, and executes queries using standard JDBC API. In CMP, the EJB container generates the data access code and handles database operations, based on the mappings provided in the Entity Bean’s deployment descriptor.

What are the advantages of using Entity Beans?

Entity Beans provide several benefits in developing enterprise applications, including:

  • Encapsulation of business logic and data access code, promoting separation of concerns and maintainability
  • Automatic transaction management, improving reliability and performance of data operations
  • Scalability by leveraging the EJB container’s capabilities, such as load balancing and clustering
  • Improved code reusability, as Entity Beans can be easily integrated with other components and systems

Related Technology Terms

  • Enterprise JavaBeans (EJB)
  • Java Persistence API (JPA)
  • Object-relational mapping (ORM)
  • Session Beans
  • Container-Managed Persistence (CMP)

Sources for More Information


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