J2EE Projects

J2EE_Application_Architrechture
J2EE_JSP
J2EE_JSF_tomcat_jetty
J2EE_JBOSS_Java_Messaging
J2EE_IEEE_TRAINING_Projects_Maxaim
J2EE_Main_Components

About J2EE

J2EE stands for Java 2 Enterprise Edition and is formerly known as the Java 2 Platform. J2EE is known as being the industry standard for building next-generation web applications and implementing enterprise-class service-oriented architecture (SOA). J2EE (Java 2 Platform, Enterprise Edition) is a Java platform designed specifically for the mainframe-scale computing typical of large enterprises. Sun Microsystems along with industry partners IBM designed J2EE to simplify application development in this environment. J2EE simplifies the process of application development and decreases the need for programming and programmer training by creating standardized, reusable modular components. It enables the tier to handle many aspects of programming automatically.

The current version of J2EE changes the name to Java EE 5. However, the functions remain largely the same. This language allows developers to create enterprise applications that are scalable and portable. These applications are then able to easily integrate with enterprise applications.

J2EE Applications and Usage

  • J2EE Applications
  • Enterprise Integration

  • Portals
  • Wireless
  • Personalisation
  • Web Services

Advantages of J2EE

  • Write Once, Run Anywhere! technology is included to ensure portability.
  • Support is provided for Common Object Request Broker Architecture (CORBA), a predecessor of Enterprise JavaBeans (EJB), so that Java objects can communicate with CORBA objects both locally and over a network through its interface broker.
  • Java Database Connectivity 2.0 (JDBC), is included as the standard interface for connecting databases.
  • A security model is included to protect data both locally and in Web-based applications.

J2EE Application Model

  • Full support is included for Enterprise JavaBeans. EJB is a server-based technology for the delivery of program components in an enterprise environment. It supports the Extensible Markup Language (XML) and has enhanced deployment and security features.
  • The Java servlet API (application programming interface) enhances consistency for developers without requiring a graphical user interface (GUI).
  • Java Server Pages (JSP) is used for dynamic Web-enabled data access and manipulation.

J2EE architecture

  • The J2EE Application Programming Model is the standard programming model used to facilitate the development of multi-tier, thin client applications.
  • The J2EE Platform includes necessary policies and APIs such as the Java servlets and Java Message Service (JMS).
  • The J2EE Compatibility Test Suite ensures that J2EE products are compatible with the platform standards.
  • The J2EE Reference Implementation explains J2EE capabilities and provides its operational definition.

Uses of J2EE

A server that is running J2EE can handle transactions, scalability, concurrency and security along with the management of various other components. The Java Servlet application programming interface negates the necessity for a graphical user interface for developers, and other specifications are unique to J2EE.

  • Java Beans
  • Enterprise JavaBeans
  • Servlets
  • Portlets
  • JavaServer pages messaging

XML

Enterprise JavaBeans supports XML (Extensible Markup Language) and has security and improved deployment features. The purpose of Enterprise JavaBeans is a server-based technology for use in an enterprise environment and is enabled to deliver various program components.

Four Major Components of J2EE

The first major component of J2EE is the ability to speed up the development of client multi-tier applications. Secondly, the J2EE platform allows for Java servlets and a Java-based message service, which is commonly referred to as JMS. A third component, the compatibility test suite of J2EE, ensures that J2EE products are compatible with platform standards. Fourth, reference implementation covers all of the capabilities of the J2EE platform and also provides its operational definition.

Enterprise JavaBeans

Enterprise JavaBeans (EJB) is a Java API developed by Sun Microsystems that defines component architecture for multi-tier client/server systems.
EJB systems allow developers to focus on the actual business architecture of the model, rather than worry about endless amounts of programming and coding needed to connect all the working parts. This task is left to EJB server vendors. Developers just design (or purchase) the needed EJB components and arrange them on the server

JBOSS

An application server written in Java that can host business components developed in Java. Essentially, JBOSS is an open source implementation of J2EE that relies on the Enterprise JavaBeans specification for functionality.

Java Beans

A specification developed by Sun Microsystems that defines how Java objects interact. An object that conforms to this specification is called a JavaBeans and is similar to an ActiveX control. It can be used by any application that understands the JavaBeans format.

The principal difference between ActiveX controls and JavaBeans are that ActiveX controls can be developed in any programming language but executed only on a Windows platform, whereas JavaBeans can be developed only in Java, but can run on any platform.

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