What is Java 2 Platform, Enterprise Edition (J2EE)

J2EE stands for Java 2 Platform, Enterprise Edition (J2EE). The J2EE is a platform popularly used for building server-side applications and provides a convenient component-based approach. J2EE is also used to develop Enterprise applications. Enterprise applications are software applications that facilitate various activities in an enterprise. In short, Enterprise applications are ones, which helps an enterprise to manage its various business activities.
The purpose of J2EE is to simplify the technical complexities for building Enterprise applications. The J2EE specifies the following for building an Enterprise application:
  • A programming model that comprises a set of Application Programming Interfaces (API) and approaches to building applications.
  • An applications infrastructure, to provide support for the Enterprise application built by using API.

J2EE Architecture:

The architecture of the J2EE platform uses a multi-tier distributed application model. J2EE multi-tier applications are generally considered to be 3-tier applications because of architecture defines a client tier, a middle-tier, and a backend tier as shown in figure:
Client-tier consists of a web component such as Servlet, JSP, or java standalone application. This tier consists of the program that interacts with the user. It provides dynamic interfaces to middle-tier.

Middle-tier is also known as the server-tier. In the middle tier enterprise bean and the web services encapsulates distributable business logic for the application.

Enterprise data tier is the database tier in which enterprise level data stored and persists in a relational database.

J2EE Technologies:

The J2EE Technologies can be divided as per their use.

1. Component Technologies: 

These technologies are an important part of the application as it holds the business logic. There are three types of components ie. JSP Page, Servlets, and Enterprise JavaBeans.

2. Service Technologies:

These technologies help the components of applications with support services to function efficiently.

3. Communications Technologies:

These technologies provide the mechanism for communication between different parts of applications irrespective of their location. These technologies are most transparent in nature to the application programmer.

J2EE Advantages:

1. Platform Independent:

J2EE is Platform independent that may be spread across many different platforms. Such kind of platform-independent programming model also reduces the difficulties encountered by integrating many of the different technologies that are specific to certain platforms and applications.

2. Reusability:

In the programming field, the code reusability is very important. Java is an object-oriented language and it provides the mechanism of reuse. We can reuse the code to use the object orientation to encapsulates shared functionality.

3. Modularity:

When we develop a complete server-side application, the server-side applications are large and complex. We can break down the large and complex application into various modules that are individually responsible for a specific task. It will make the application much easier to maintain and understand.

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What is Java 2 Platform, Enterprise Edition (J2EE) What is Java 2 Platform, Enterprise Edition (J2EE) Reviewed by Prashant Srivastava on December 25, 2018 Rating: 5

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