What is EJB explain its architecture?

What is EJB explain its architecture?

Enterprise Java Beans (EJB) is a development architecture for building highly scalable and robust enterprise level applications to be deployed on J2EE compliant Application Server such as JBOSS, Web Logic etc. EJB 3.0 is being a great shift from EJB 2.0 and makes development of EJB based applications quite easy.

What are the components of EJB architecture?

The EJB architecture consists of three main components: enterprise beans (EJBs), the EJB container, and the Java application server.

What is EJB and its types?

Enterprise JavaBeans (EJBs) can be one of three types: session beans, entity beans, or message-driven beans. Session beans can be stateful or stateless and are used for business logic functionality. Stateless session beans are used for business services. They do not retain client state across calls.

What does the EJB specification architecture define Mcq?

Enterprise Java Beans as EJB is an architecture for setting up the program components, written in the Java programming language, that run in the server parts of a computer network that uses in the client/server model.

Which role in EJB architecture is responsible for EJB server?

The EJB container provider is responsible for supplying a server and container that conform to the EJB 2.0 architecture specifications. The EJB container is a hosting environment for EJB instances. The container also has a deployment management tool that enables the deployer to manage J2EE applications.

What are the functions of EJB?

EJB provides an architecture to develop and deploy component based enterprise applications considering robustness, high scalability, and high performance. An EJB application can be deployed on any of the application server compliant with the J2EE 1.3 standard specification.

What is the purpose of EJB in Java?

EJB is a server-side software component that encapsulates business logic of an application. An EJB web container provides a runtime environment for web related software components, including computer security, Java servlet lifecycle management, transaction processing, and other web services.

How does EJB works in Java?

An EJB container is a run-time container for beans that are deployed to an application server. The container is automatically created when the application server starts up, and serves as an interface between a bean and run-time services such as: Life-cycle management. Code generation.

What are the benefits of EJB?

Advantages of EJB The EJB developer focuses on solving business problems and business logic. Java beans are portable components that help the JAVA application assembler to formulate new applications for the already existing JavaBeans. EJB container helps in providing system-level services to enterprise Java beans.

What is an EJB module?

An Enterprise JavaBeans (EJB) module is used to assemble one or more enterprise beans into a single deployable unit. An EJB module is stored in a standard Java™ archive (JAR) file. An EJB module contains the following: One or more deployable enterprise beans.

What is EJB technology?

Enterprise JavaBeans (EJB) technology is the server-side component architecture for Java Platform, Enterprise Edition (Java EE). EJB technology enables rapid and simplified development of distributed, transactional, secure and portable applications based on Java technology.

What are the key features of EJB technology?

5. What are the key features of the EJB technology?

  • EJB components are server-side components written entirely in the Java programming language.
  • EJB components contain business logic only – no system-level programming & services, such as transactions, security, life-cycle, threading, persistence, etc.

Where EJB are used in software architecture implementation?

The Stateful EJBs are used when we have to maintain the state of the application on the backend during the user session. The shopping cart of an online shopping application is an example of the Stateful EJB. In order to achieve such application, we will use the following steps: We will create the stateful session bean.