EJB Types

 EJB types

➡️ Session Bean : Session bean represents a single client inside the App Server.
➡️ Entity Bean : Entity bean represents a business object in a persistent storage mechanism.
➡️ Message Driven Bean : A message-driven bean is an enterprise bean that allows J2EE applications to process messages asynchronously.

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Usage of EJB

 

When to Use Enterprise Java Beans

➡️ To Simplify development of large scale enterprise level app.
➡️ To focus only on business logic of the app.
➡️ When the app is distributed : When the resources and data are distributed across multiple sites, Choose EJB when application will need to support multiple, concurrent users.
➡️ When the app is performance-centric : use of EJBs and the application server provide high performance and very good scalability.
➡️ Manage transactions : When transaction management is required to ensure data integrity, EJBs may be used.
➡️ Manage security : Separation of Business Logic

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EJB Introduction

An Enterprise Java Bean is:

➡️ A reusable component
➡️ A Java object
➡️ An encapsulation of enterprise business logic and data
➡️ Executed in a Containers

What is EJB?
➡️ EJB is an architecture for setting up program components, that run in the server, to develop modular construction of enterprise app.
➡️ It is reusable in multiple apps.
➡️ It is built on the JavaBeans technology to distribute components. It encapsulates the business logic of a web app.
➡️ It provides an architecture to develop and deploy component based enterprise apps.

Summary of video:
➡️ Java Bean Vs Enterprise Java Bean
➡️ Difference between RMI and EJB
➡️ EJB Architecture
➡️ Benefits of EJB
➡️ Restriction on EJB
➡️ Disadvantages of Enterprise Java Beans

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