Enterprise Java beans (EJB) are components of a Java EE application that run in a container and provide business logic for the application. EJBs can be session beans, message-driven beans, or entity beans.
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When Enterprise Java beans was introduced?
Enterprise Java beans were introduced in the Java EE platform in 1999.
When to use Enterprise Java beans?
There are many situations where Enterprise Java beans can be used. For example, if you need to develop a complex business system that will be deployed on a Java EE application server, Enterprise Java beans would be a good choice. Similarly, if you need to develop a system that will be accessed by many users concurrently, Enterprise Java beans would again be
Types of Enterprise Java beans?
There are three types of Enterprise Java beans: session beans, message-driven beans, and entity beans.
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- Session beans can be stateless or stateful and are used to represent a single client interaction with the enterprise bean.
- Message-driven beans are used to process messages from a message queue.
- Entity beans are used to represent data in a database. Entity beans can be either Container-Managed Persistence (CMP) or Bean-Managed Persistence (BMP).
How do Enterprise Java beans access the database?
Enterprise Java beans can access the database using either JDBC or JPA.
JDBC is a Java API that allows Java programs to access databases.
JPA is a Java Persistence API that allows Java programs to access relational databases. JPA is a standard specification and there are many implementations of JPA available.
Enterprise Java beans vs spring?
There are many differences between Enterprise Java beans and spring. Enterprise Java beans are components of a Java EE application that run in a container and provide business logic for the application. Spring is a Java framework that provides a comprehensive programming and configuration model for modern Java applications.
Difference between JavaBeans and Enterprise Java beans?
JavaBeans are components of a Java application that can be reused in other applications. Enterprise Java beans are components of a Java EE application that run in a container and provide business logic for the application. JavaBeans are not tied to any specific architecture or framework, whereas Enterprise Java beans are tied to the Java EE platform.
Are Enterprise Java beans still used?
Yes, Enterprise Java beans are still used. They are a standard component of the Java EE platform and are used in many applications.
What is the purpose of Enterprise Java beans?
The purpose of Enterprise Java beans is to provide a component-based, platform-independent architecture for developing enterprise applications. Enterprise Java beans are used in a wide variety of applications, such as e-commerce, banking, and healthcare.
What are the benefits of Enterprise Java beans?
There are many benefits to using Enterprise Java beans. Some of these benefits include:
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- Reduced development time
- Increased flexibility
- Reduced complexity
- Platform independence
What is the difference between a local and a remote interface?
A local interface is an interface that is used by a single client. A remote interface is an interface that can be used by multiple clients. Local interfaces are typically faster and more efficient than remote interfaces.
What is the difference between a stateless and a stateful session bean?
A stateless session bean does not maintain any state between client invocations. A stateful session bean maintains state between client invocations. Stateless session beans are typically used for simple operations, such as calculating a total, whereas stateful session beans are used for more complex operations, such as maintaining a shopping cart.
What is the difference between a message-driven bean and a normal bean?
A message-driven bean is a type of Enterprise Java bean that processes messages from a message queue. A normal bean is a type of Enterprise Java bean that does not process messages from a message queue. Message-driven beans are typically used for asynchronous processing, such as processing email messages.
What is the difference between an entity bean and a session bean?
An entity bean represents data in a database. A session bean represents a single client interaction with the enterprise bean. Entity beans can be either Container-Managed Persistence (CMP) or Bean-Managed Persistence (BMP). Session beans are typically used for simple operations, such as calculating a total.
