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 <h1 class="topictitle1">Developing EJB 3.0 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) 3.0 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>

 <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 3.0</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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	<meta content="text/html; charset=utf-8" http-equiv="Content-Type" />
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	<meta content="concept" name="DC.Type" />
	<meta name="DC.Title" content="Developing EJB 3.0 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) 3.0 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) 3.0 specification." />
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	<link href="../../org.eclipse.wst.doc.user/common.css" type="text/css" rel="stylesheet" />
	<title>Developing EJB 3.0 Applications</title>
	</head>
	<body id="cejb3"><a name="cejb3"><!-- --></a>


	<h1 class="topictitle1">Developing EJB 3.0 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) 3.0 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>

	<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 3.0</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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