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 <body id="cejb3"><a name="cejb3"><!-- --></a>


 <h1 class="topictitle1">Developing EJB 3.1 Applications</h1>


 <div><p>You can use the workbench to develop and test enterprise
 beans that conform to the distributed component architecture defined
 in the Sun Microsystems Enterprise JavaBeans (EJB) 3.10 specification.</p>

 <p> Using this specification, you can develop beans more simply than
 in the 2.1 standard. You can annotate your Java source code to provide
 information that was previously contained in XML deployment descriptors.
 Using Java™ annotations allows you to create EJBs and Java Persistence Architecture (JPA) beans quickly
 and easily from “plain old Java objects
 (POJOs).  For EJBs, these can be created without implementing EnterpriseBean
 interfaces. </p>

 <p>This product supports the Enterprise JavaBeans 2.1 and 3.0 specification
 levels.  All of the EJB tools in the product are accessible from the Java EE perspective in the workbench. You can
 create session beans (stateful or stateless) or message-driven beans,
 by simply specifying the component defining annotation in your POJO.
  Additional configuration for your bean can be done by specifying
 additional annotations in the Java class.
 The Java editor provides validation, content assistance
 and QuickFixes for your EJB 3.0 annotations, as well as support for
 refactoring beans. For richer assistance with the EJB 3.0 annotations,
 you can use the Annotations view to add or delete annotations, and
 to modify the attribute values of annotations. Deployment descriptors
 for your EJB 3.0 modules are optional, but can be created for additional
 configuration.</p>

 <p><strong>New in EJB 3.1 (JSR 318)</strong></p>

 <div class="p"><ul>
 <li>Singleton beans (@Singleton)<ul>
 <li>Before EJB 3.1, there was no easy way to share data throughout
 the application; the EJB 3.1 Singleton is an application-wide singleton.</li>

 <li> Concurrency can be managed either by the container or by the
 Bean Developer</li>

 </ul>
 </li>

 </ul>
 </div>

 <div class="p">Java EE 5 streamlines EJB development in the following ways: <ul>
 <li>Fewer required classes and interfaces<ul>
 <li>Home and object interfaces are no longer required – you need the
 business interface only</li>

 <li>No need to implement javax.ejb.SessionBean</li>

 <li>No need to declare checked exceptions</li>

 </ul>
 </li>

 <li>Optional deployment descriptors<ul>
 <li>Annotations provide component definition and dependency injection</li>

 </ul>
 </li>

 <li>Simple lookups<ul>
 <li>new EJBContext() interface method replaces JNDI calls</li>

 </ul>
 </li>

 <li>Lightweight persistence for object-relational mapping<ul>
 <li>Entities are POJOs that provide an object-oriented view of the
 data stored in relational database</li>

 </ul>
 </li>

 <li>New Interceptors class (new in Java EE 5)<ul>
 <li>Interceptors are objects that can intercept a call to a business
 method (to handle security for example)</li>

 <li>Similar in purpose and action to servlet filter or Web services
 handler</li>

 <li>Provide limited form of aspect-oriented programming</li>

 </ul>
 </li>

 </ul>
 </div>

 <p>For further additional information on EJB 3.0, see the official
 specification: <a href="http://jcp.org/en/jsr/detail?id=220" target="_blank">JSR 220: Enterprise JavaBeans™ 3.0</a></p>

 </div>

 <div>
 <ul class="ullinks">
 <li class="ulchildlink"><strong><a href="../topics/tecrtpro.html">Creating EJB projects</a></strong><br />
 An EJB project is used to organize the resources contained in an EJB module.</li>
 <li class="ulchildlink"><strong><a href="../topics/ccontentassist3.html">Content assist and EJB 3.1</a></strong><br />
 The content assist tool is a feature of the workbench. You can type code in your Java editor and the content assist tool recommends possibilities to complete your code.</li>
 </ul>

 <div class="familylinks">
 <div class="parentlink"><strong>Parent topic:</strong> <a href="../topics/ceover.html" title="The workbench provides a specialized environment that you can use to develop and test enterprise beans that conform to the distributed component architecture defined in the Sun Microsystems Enterprise JavaBeans (EJB) version specification. This product supports the Enterprise JavaBeans 1.1, 2.0, 2.1, and 3.0 specification levels.">EJB 2.x application development</a></div>
 </div>
 </div>

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	<head>
	<meta content="text/html; charset=utf-8" http-equiv="Content-Type" />
	<meta name="copyright" content="Copyright (c) 2000, 2011 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 http://www.eclipse.org/legal/epl-v10.html. Contributors: IBM Corporation - initial API and implementation" />
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	<meta content="concept" name="DC.Type" />
	<meta name="DC.Title" content="Developing EJB 3.1 Applications" />
	<meta name="abstract" content="You can use the workbench to develop and test enterprise beans that conform to the distributed component architecture defined in the Sun Microsystems Enterprise JavaBeans (EJB) 3.10 specification." />
	<meta name="description" content="You can use the workbench to develop and test enterprise beans that conform to the distributed component architecture defined in the Sun Microsystems Enterprise JavaBeans (EJB) 3.10 specification." />
	<meta content="Enterprise JavaBeans 3.0" name="DC.subject" />
	<meta content="Enterprise JavaBeans 3.0" name="keywords" />
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	<link href="../../org.eclipse.wst.doc.user/common.css" type="text/css" rel="stylesheet" />
	<title>Developing EJB 3.1 Applications</title>
	</head>
	<body id="cejb3"><a name="cejb3"><!-- --></a>


	<h1 class="topictitle1">Developing EJB 3.1 Applications</h1>



	<div><p>You can use the workbench to develop and test enterprise
	beans that conform to the distributed component architecture defined
	in the Sun Microsystems Enterprise JavaBeans (EJB) 3.10 specification.</p>

	<p> Using this specification, you can develop beans more simply than
	in the 2.1 standard. You can annotate your Java source code to provide
	information that was previously contained in XML deployment descriptors.
	Using Java™ annotations allows you to create EJBs and Java Persistence Architecture (JPA) beans quickly
	and easily from “plain old Java objects
	(POJOs). For EJBs, these can be created without implementing EnterpriseBean
	interfaces. </p>

	<p>This product supports the Enterprise JavaBeans 2.1 and 3.0 specification
	levels. All of the EJB tools in the product are accessible from the Java EE perspective in the workbench. You can
	create session beans (stateful or stateless) or message-driven beans,
	by simply specifying the component defining annotation in your POJO.
	Additional configuration for your bean can be done by specifying
	additional annotations in the Java class.
	The Java editor provides validation, content assistance
	and QuickFixes for your EJB 3.0 annotations, as well as support for
	refactoring beans. For richer assistance with the EJB 3.0 annotations,
	you can use the Annotations view to add or delete annotations, and
	to modify the attribute values of annotations. Deployment descriptors
	for your EJB 3.0 modules are optional, but can be created for additional
	configuration.</p>

	<p><strong>New in EJB 3.1 (JSR 318)</strong></p>

	<div class="p"><ul>
	<li>Singleton beans (@Singleton)<ul>
	<li>Before EJB 3.1, there was no easy way to share data throughout
	the application; the EJB 3.1 Singleton is an application-wide singleton.</li>

	<li> Concurrency can be managed either by the container or by the
	Bean Developer</li>

	</ul>
	</li>

	</ul>
	</div>

	<div class="p">Java EE 5 streamlines EJB development in the following ways: <ul>
	<li>Fewer required classes and interfaces<ul>
	<li>Home and object interfaces are no longer required – you need the
	business interface only</li>

	<li>No need to implement javax.ejb.SessionBean</li>

	<li>No need to declare checked exceptions</li>

	</ul>
	</li>

	<li>Optional deployment descriptors<ul>
	<li>Annotations provide component definition and dependency injection</li>

	</ul>
	</li>

	<li>Simple lookups<ul>
	<li>new EJBContext() interface method replaces JNDI calls</li>

	</ul>
	</li>

	<li>Lightweight persistence for object-relational mapping<ul>
	<li>Entities are POJOs that provide an object-oriented view of the
	data stored in relational database</li>

	</ul>
	</li>

	<li>New Interceptors class (new in Java EE 5)<ul>
	<li>Interceptors are objects that can intercept a call to a business
	method (to handle security for example)</li>

	<li>Similar in purpose and action to servlet filter or Web services
	handler</li>

	<li>Provide limited form of aspect-oriented programming</li>

	</ul>
	</li>

	</ul>
	</div>

	<p>For further additional information on EJB 3.0, see the official
	specification: <a href="http://jcp.org/en/jsr/detail?id=220" target="_blank">JSR 220: Enterprise JavaBeans™ 3.0</a></p>

	</div>

	<div>
	<ul class="ullinks">
	<li class="ulchildlink"><strong><a href="../topics/tecrtpro.html">Creating EJB projects</a></strong><br />
	An EJB project is used to organize the resources contained in an EJB module.</li>
	<li class="ulchildlink"><strong><a href="../topics/ccontentassist3.html">Content assist and EJB 3.1</a></strong><br />
	The content assist tool is a feature of the workbench. You can type code in your Java editor and the content assist tool recommends possibilities to complete your code.</li>
	</ul>

	<div class="familylinks">
	<div class="parentlink"><strong>Parent topic:</strong> <a href="../topics/ceover.html" title="The workbench provides a specialized environment that you can use to develop and test enterprise beans that conform to the distributed component architecture defined in the Sun Microsystems Enterprise JavaBeans (EJB) version specification. This product supports the Enterprise JavaBeans 1.1, 2.0, 2.1, and 3.0 specification levels.">EJB 2.x application development</a></div>
	</div>
	</div>

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