In the world of software, a platform is a combination of hardware and software necessary to run applications. J2EE is a platform for delivering enterprise applications. But what does it mean to say that J2EE is a platform? J2EE isn't hardware, although it can run on any hardware with an appropriate JVM. And J2EE isn't software exactly, since many vendors provide J2EE-compatible systems, and even provide their own JVMs.
J2EE is a platform-independent, Java-centric environment from Sun for developing, building and deploying Web-based enterprise applications
online.
The J2EE platform is a collection of related technology specifications that describe required APIs and policies. The content of the specifications is controlled by the Java Community Process (JCP). Interested vendors come to consensus on the specifications' contents, and then compete on implementations of those specifications. The J2EE platform consists of a set of services, APIs, and protocols that provide the functionality for developing multitiered, Web-based applications.
Some benefits of deploying to a J2EE-compliant architecture include:
1. A simplified architecture that is based on standard components, services, and clients. The architecture maximizes the write-once, run-anywhere Java technology.
2. 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.
3. Scalability to meet demand, by distributing containers across multiple systems and using database connection pooling, for example.
4. A better choice of application development tools and components from vendors providing standard solutions.
5. A flexible security model that provides single sign-on support, integration with legacy security schemes, and a unified approach to securing application components.
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