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 <h1 class="topictitle1">EJB 3.0 and EJB 3.1 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 and EJB 3.1</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 and EJB 3.1 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="DC.Title" content="EJB 3.0 and EJB 3.1 architecture" />
	<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." />
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	<title>EJB 3.0 and EJB 3.1 architecture</title>
	</head>
	<body id="ejbarch"><a name="ejbarch"><!-- --></a>


	<h1 class="topictitle1">EJB 3.0 and EJB 3.1 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 and EJB 3.1</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 and EJB 3.1 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>
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