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 <h1 class="topictitle1">EJB 3.0 architecture</h1>


 <div><p>This topic provides a high-level overview of the distributed component
 architecture defined in the Sun Microsystems Enterprise JavaBeans™ (EJB)
 version 3.0 architecture specification.</p>

 <p><strong>Enterprise JavaBeans</strong> is a standard server-side component
 model for distributed business applications. The EJB specification is part
 of the <strong>Java™ Platform Enterprise Edition</strong>.</p>

 <p><strong>EJB 3.0</strong> makes it much easier to develop EJBs, using annotations
 rather than the complex deployment descriptors used in version 2.x. The use
 of home and remote interfaces and the <em>ejb-jar.xml</em> file are also no
 longer required in this release. They are replaced with a business interface
 and a bean class that implements the interface.</p>

 <p>For more information about EJB 3.0 specification go to the following Web
 site: <a href="http://java.sun.com/products/ejb/docs.html#specs" target="_blank" title="">http://java.sun.com</a> </p>

 </div>

 <div>
 <ul class="ullinks">
 <li class="ulchildlink"><strong><a href="../topics/cpojosandee5.html">Plain old Java objects</a></strong><br />
 Although POJOs existed before, they play a more important role in the programming methodology of Java EE 5. Now, you can now create EJB applications with persistence capabilities by using enterprise beans and entities created from POJOs.</li>
 <li class="ulchildlink"><strong><a href="../topics/cejb3vejb21.html">Differences between EJB 3.0 and EJB 2.1</a></strong><br />
 Compared to EJB 2.1, EJB 3.0 simplifies the process of creating Enterprise JavaBean applications.</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 name="abstract" content="This topic provides a high-level overview of the distributed component architecture defined in the Sun Microsystems Enterprise JavaBeans (EJB) version 3.0 architecture specification." />
	<meta name="description" content="This topic provides a high-level overview of the distributed component architecture defined in the Sun Microsystems Enterprise JavaBeans (EJB) version 3.0 architecture specification." />
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	<title>EJB 3.0 architecture</title>
	</head>
	<body id="ejbarch"><a name="ejbarch"><!-- --></a>


	<h1 class="topictitle1">EJB 3.0 architecture</h1>



	<div><p>This topic provides a high-level overview of the distributed component
	architecture defined in the Sun Microsystems Enterprise JavaBeans™ (EJB)
	version 3.0 architecture specification.</p>

	<p><strong>Enterprise JavaBeans</strong> is a standard server-side component
	model for distributed business applications. The EJB specification is part
	of the <strong>Java™ Platform Enterprise Edition</strong>.</p>

	<p><strong>EJB 3.0</strong> makes it much easier to develop EJBs, using annotations
	rather than the complex deployment descriptors used in version 2.x. The use
	of home and remote interfaces and the <em>ejb-jar.xml</em> file are also no
	longer required in this release. They are replaced with a business interface
	and a bean class that implements the interface.</p>

	<p>For more information about EJB 3.0 specification go to the following Web
	site: <a href="http://java.sun.com/products/ejb/docs.html#specs" target="_blank" title="">http://java.sun.com</a> </p>

	</div>

	<div>
	<ul class="ullinks">
	<li class="ulchildlink"><strong><a href="../topics/cpojosandee5.html">Plain old Java objects</a></strong><br />
	Although POJOs existed before, they play a more important role in the programming methodology of Java EE 5. Now, you can now create EJB applications with persistence capabilities by using enterprise beans and entities created from POJOs.</li>
	<li class="ulchildlink"><strong><a href="../topics/cejb3vejb21.html">Differences between EJB 3.0 and EJB 2.1</a></strong><br />
	Compared to EJB 2.1, EJB 3.0 simplifies the process of creating Enterprise JavaBean applications.</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>
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