Java Platform, Enterprise Edition

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(Redirected from J2EE)

Template:Java platforms Java Platform, Enterprise Edition or Java EE (formerly known as Java 2 Platform, Enterprise Edition or J2EE up to version 1.4), is a programming platform—part of the Java platform—for developing and running distributed multi-tier architecture Java applications, based largely on modular software components running on an application server. The Java EE platform is defined by a specification. Java EE is also considered informally to be a standard because providers must agree to certain conformance requirements in order to declare their products as Java EE compliant; albeit with no ISO or ECMA standard.

Java EE includes several API specifications, such as JDBC, client-side applets, RPC, CORBA, and defines how to coordinate them. Java EE also features some specifications unique to Java EE for components. These include Enterprise Java Beans, servlets, portlets (following the Java Portlet specification), JavaServer Pages and several web service technologies. This allows the developer to create an enterprise application that is portable between platforms and scalable, while integrating with legacy technologies.

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History

The original J2EE specification was developed by Sun Microsystems. Starting with J2EE 1.3, the specification has been developed under the Java Community Process. JSR 58 specifies J2EE 1.3 and JSR 151 specifies the J2EE 1.4 specification. As of 2006, the Java EE 5 specification is being developed under JSR 244.

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General APIs

The Java EE APIs includes several technologies that extend the functionality of the base Java SE APIs.

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Template:Javadoc:EE.*

The Enterprise Java Beans API defines a set of APIs that a distributed object container will support in order to provide persistence, remote procedure calls (using RMI or RMI-IIOP), concurrency control, and access control for distributed objects.

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The Servlets API defines a set of APIs between a web container and a servlet that is responsible for processing requests and issuing responses.

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The javax.servlet.jsp and Template:Javadoc:EE packages define the JavaServer Pages API.

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The javax.naming, Template:Javadoc:EE, Template:Javadoc:EE, Template:Javadoc:EE and Template:Javadoc:EE packages define the Java Naming and Directory Interface (JNDI) API.

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Template:Javadoc:EE, Template:Javadoc:EE

The java.sql and javax.sql packages define the Java Database Connectivity (JDBC) API.

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These packages define the Java Transaction API (JTA).

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These packages define the JAXP API.

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These packages define the Java Message Service (JMS) API.

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Low cost development

One of the benefits of Java EE as a platform is that it is possible to get started with little or no cost. The Java EE implementation from Sun Microsystems can be downloaded for free, and there are a great many open source tools available to extend the platform or to simplify development.

Examples of third party open source Java development tools include:

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J2EE 1.4 application server certified

  • GlassFish, an open-source application server from Sun
  • JBoss, an open-source application server from JBoss
  • Geronimo, an open-source application server from Apache
  • JOnAS, an open-source application server from ObjectWeb
  • Resin, an application server with integrated XML support
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Java EE vs. .NET

Arguments about the merits of Java EE vs. Microsoft's .NET abound. One "consensus" is that Java EE is best for multiplatform architectures, whereas .NET should be used for a strictly Microsoft platform (and not to be migrated to for non-Microsoft platform integration).

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Publications

  • {{cite book 
| last = Perrone
| first = Paul J.
| authorlink = 
| coauthors = Chaganti, Krishna
| year = 2003
| title = J2EE Developer's Handbook
| publisher = Sam's Publishing
| location = Indianapolis, Indiana
| id = ISBN 0-672-32348-6

}}

  • {{cite book 
| last = Bodoff
| first = Stephanie
| year = 2004
| title = The J2EE Tutorial
| publisher = Addison-Wesley
| location = Boston
| id = ISBN 0-321-24575-X

}}

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See also

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External links

Examples of Java EE application servers include:

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