What is Java 2 Platform, Enterprise Edition (J2EE) – Architecture, Technologies, Features Supported, Advantages,

What is java2: J2EE stands for Java 2 Platform, Enterprise Edition (J2EE). This platform is popularly used for building server-side applications and gives 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 help an enterprise to manage its various business activities.

About J2EE

J2EE’s Purpose is to simplify the technical complexities while building Enterprise applications.

The J2EE specifies the following for building an Enterprise application:

  • A programming model includes a set of Application Programming Interfaces (API) and approaches to building applications.
  • Applications infrastructure, to offer support for the Enterprise application built using the 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 the figure:

What is Java 2 Platform, Enterprise Edition

Client-tier consists of a web component such as Servlet, JSP, or java standalone application. This tier includes a program interacts with the user. It provides dynamic interfaces to the 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.

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

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Key Features and Services Offered by J2EE

  • J2EE supports pure HTML along with Java Applets or Applications. It depends on Java Server Pages and Servlet Code for HTML Creation or other formatted data for client.
  • EJBs provide another layer in which the platform’s logic is stored. EJB Server Provides the functions like threading, security and memory management, concurrency. These Services are Transparent to the Author.
  • JDBC is the JAVA equivalent to ODBC and is the standard interface for JAVA Databases. Servlet API in JAVA enhances consistency for developers eliminating the need for a Graphical User Interface.

J2EE Technologies

The J2EE Technologies can be divided as per their use.

1. Component Technologies: These technologies play an important part in the application as it contains 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 a Platform independent that may be spread across many different platforms. This kind of platform-independent programming model reduces the difficulties encountered due to integration of many different technologies that are specific to certain platforms and applications.

2. Reusability: In the programming field, code reusability is very important. As Java is an object-oriented language and it allows for 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. Makes the application much simpler to maintain and understand.