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The Java 2 Platform, Enterprise Edition (J2ee) defines the standard for developing multitier enterprise applications.
Enterprise Edition (J2ee) defines a standard architecture that is delivered as the following elements:

• Application Programming Model;
• J2ee Platform;
• J2ee Compatibility Test Suite;
• J2ee Reference Implementation.
  
  The J2ee platform consists of standardized, modular components, by providing a complete set of services to those components, and by handling many details of application behavior automatically, without complex programming.
  
  The J2ee platform takes advantage of many features of the Java 2 Platform, Standard Edition (J2SE), such as "Write Once, Run Anywhere" portability, JDBC API for database access, CORBA technology for interaction with existing enterprise resources, and a security model that protects data even in internet applications. Building on this base, the Java 2 Platform, Enterprise Edition adds full support for Enterprise JavaBeans components, Java Servlets API, JavaServer Pages and XML technology. The J2ee standard includes complete specifications and compliance tests to ensure portability of applications across the wide range of existing enterprise systems capable of supporting the J2ee platform. In addition, the J2ee specification now ensures Web services interoperability through support for the WS-I Basic Profile. The main strong points of J2ee technology include: :

• A simplified architecture which is based on standard components, services and clients, that takes advantage of the write-once, run-anywhere Java technology;
• Services providing integration with existing systems, including Java DataBase Connectivity (JDBC); Java Message Service (JMS); Java Connector Architecture (JCA); Java Interface Definition Language (Java IDL); the JavaMail API; and Java Transaction API (JTA and JTS) for reliable business transactions;
• Scalability to meet demand, by distributing containers across multiple system and using database connection pooling, for example;
• A better choice of application development tools and components from vendors providing standard solutions;
• A flexible security model that provides single sign-on support, integration with legacy security schemes, and a unified approach to securing application components.
  

Related Links
Microsoft Technologies	Java Enterprise Platform
Oracle’s Applications and technology	ERP Services