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 <h1 class="id_title">Java EE 5: Overview</h1>


 <div><p class="id_shortdesc">Using the Java™ Platform, Enterprise Edition (Java EE)
 architecture, you can build distributed Web and enterprise applications. This
 architecture helps you focus on presentation and application issues, rather
 than on systems issues.</p>

 <p>You can use the Java EE 5 tools and features to create applications
 that are structured around modules with different purposes, such as Web sites
 and Enterprise JavaBeans™ (EJB) applications. When you use EJB
 3.0 components, you can create a distributed, secure application with transactional
 support. When you develop applications that access persistent data, you can
 use the new Java Persistence API (JPA). This standard simplifies
 the creation and use of persistent entities, as well as adding new features.
 For developing presentation logic, you can use technologies such as JavaServer
 Pages (JSP) or JavaServer Faces (JSF).</p>

 <div class="p">Using the Java EE 5 Platform Enterprise Edition (Java EE) , you
 can develop applications more quickly and conveniently than in previous versions.
 The Java EE
 5 platform replaces Java 2 Enterprise Edition (J2EE), version
 1.4. The product tools support for both versions. Java EE 5 significantly
 enhances ease of use providing<ul>
 <li>Reduced development time</li>

 <li>Reduced application complexity</li>

 <li>Improved application performance</li>

 </ul>
 </div>

 <div class="p">Java EE 5 provides a simplified programming model, including the following
 tools:<ul>
 <li>Inline configuration with annotations, making deployment descriptors now
 optional</li>

 <li>Dependency injection, hiding resource creation and lookup from application
 code</li>

 <li>Java persistence API (JPA) allows data management without explicit SQL
 or JDBC</li>

 <li>Use of plain old Java objects (POJOs) for Enterprise JavaBeans and Web
 services</li>

 </ul>
 </div>

 <div class="p">Java EE 5 provides simplified packaging rules for enterprise applications:<ul>
 <li>Web applications us .WAR files</li>

 <li>Resource adapters use .RAR files</li>

 <li>Enterprise applications use .EAR files</li>

 <li>The <samp class="codeph">lib</samp> directory contains shared .JAR files</li>

 <li>A .JAR file with <samp class="codeph">Main-Class</samp> implies an application client</li>

 <li>A .JAR file with @Stateless annotation implies an EJB application</li>

 <li>Many simple applications no longer require deployment descriptors, including<ul>
 <li>EJB applications (.JAR files)</li>

 <li>Web applications that use JSP technology only</li>

 <li>Application clients</li>

 <li>Enterprise applications (.EAR files)</li>

 </ul>
 </li>

 </ul>
 </div>

 <div class="p">Java EE 5 provides simplified resource access using dependency injection:<ul>
 <li>In the Dependency Injection pattern, an external entity automatically
 supplies an object's dependencies.<ul>
 <li>The object need not request these resources explicitly</li>

 </ul>
 </li>

 <li>In Java EE 5, dependency injection can be applied to all resources that
 a component needs<ul>
 <li>Creation and lookup of resources are hidden from application code</li>

 </ul>
 </li>

 <li>Dependency injection can be applied throughout Java EE 5 technology:<ul>
 <li>EJB containers</li>

 <li>Web containers</li>

 <li>Clients</li>

 <li>Web services</li>

 </ul>
 </li>

 </ul>
 </div>

 </div>

 <div>
 <div class="familylinks">
 <div class="parentlink"><strong>Parent topic:</strong> <a href="../topics/cjavaee5.html" title="The Java EE 5 programming model simplifies the process of creating Java applications.">Developing Java EE Applications</a></div>
 </div>
 </div>

 </body>
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	<meta content="text/html; charset=utf-8" http-equiv="Content-Type" />
	<meta name="copyright" content="Copyright (c) 2000, 2009 IBM Corporation and others. All rights reserved. This program and the accompanying materials are made available under the terms of the Eclipse Public License v1.0 which accompanies this distribution, and is available at https://www.eclipse.org/legal/epl-2.0/. Contributors: IBM Corporation - initial API and implementation" />
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	<meta name="DC.Title" content="Java EE 5: Overview" />
	<meta name="abstract" content="Using the Java Platform, Enterprise Edition (Java EE) architecture, you can build distributed Web and enterprise applications. This architecture helps you focus on presentation and application issues, rather than on systems issues." />
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	<title>Java EE 5: Overview</title>
	</head>
	<body id="cjavaee5"><a name="cjavaee5"><!-- --></a>


	<h1 class="id_title">Java EE 5: Overview</h1>



	<div><p class="id_shortdesc">Using the Java™ Platform, Enterprise Edition (Java EE)
	architecture, you can build distributed Web and enterprise applications. This
	architecture helps you focus on presentation and application issues, rather
	than on systems issues.</p>

	<p>You can use the Java EE 5 tools and features to create applications
	that are structured around modules with different purposes, such as Web sites
	and Enterprise JavaBeans™ (EJB) applications. When you use EJB
	3.0 components, you can create a distributed, secure application with transactional
	support. When you develop applications that access persistent data, you can
	use the new Java Persistence API (JPA). This standard simplifies
	the creation and use of persistent entities, as well as adding new features.
	For developing presentation logic, you can use technologies such as JavaServer
	Pages (JSP) or JavaServer Faces (JSF).</p>

	<div class="p">Using the Java EE 5 Platform Enterprise Edition (Java EE) , you
	can develop applications more quickly and conveniently than in previous versions.
	The Java EE
	5 platform replaces Java 2 Enterprise Edition (J2EE), version
	1.4. The product tools support for both versions. Java EE 5 significantly
	enhances ease of use providing<ul>
	<li>Reduced development time</li>

	<li>Reduced application complexity</li>

	<li>Improved application performance</li>

	</ul>
	</div>

	<div class="p">Java EE 5 provides a simplified programming model, including the following
	tools:<ul>
	<li>Inline configuration with annotations, making deployment descriptors now
	optional</li>

	<li>Dependency injection, hiding resource creation and lookup from application
	code</li>

	<li>Java persistence API (JPA) allows data management without explicit SQL
	or JDBC</li>

	<li>Use of plain old Java objects (POJOs) for Enterprise JavaBeans and Web
	services</li>

	</ul>
	</div>

	<div class="p">Java EE 5 provides simplified packaging rules for enterprise applications:<ul>
	<li>Web applications us .WAR files</li>

	<li>Resource adapters use .RAR files</li>

	<li>Enterprise applications use .EAR files</li>

	<li>The <samp class="codeph">lib</samp> directory contains shared .JAR files</li>

	<li>A .JAR file with <samp class="codeph">Main-Class</samp> implies an application client</li>

	<li>A .JAR file with @Stateless annotation implies an EJB application</li>

	<li>Many simple applications no longer require deployment descriptors, including<ul>
	<li>EJB applications (.JAR files)</li>

	<li>Web applications that use JSP technology only</li>

	<li>Application clients</li>

	<li>Enterprise applications (.EAR files)</li>

	</ul>
	</li>

	</ul>
	</div>

	<div class="p">Java EE 5 provides simplified resource access using dependency injection:<ul>
	<li>In the Dependency Injection pattern, an external entity automatically
	supplies an object's dependencies.<ul>
	<li>The object need not request these resources explicitly</li>

	</ul>
	</li>

	<li>In Java EE 5, dependency injection can be applied to all resources that
	a component needs<ul>
	<li>Creation and lookup of resources are hidden from application code</li>

	</ul>
	</li>

	<li>Dependency injection can be applied throughout Java EE 5 technology:<ul>
	<li>EJB containers</li>

	<li>Web containers</li>

	<li>Clients</li>

	<li>Web services</li>

	</ul>
	</li>

	</ul>
	</div>

	</div>

	<div>
	<div class="familylinks">
	<div class="parentlink"><strong>Parent topic:</strong> <a href="../topics/cjavaee5.html" title="The Java EE 5 programming model simplifies the process of creating Java applications.">Developing Java EE Applications</a></div>
	</div>
	</div>

	</body>
	</html>