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 <h1 class="id_title">J2EE architecture</h1>


 <div class="id_conbody"><p class="id_shortdesc">The Java™ 2 Platform, Enterprise Edition (J2EE)
 provides a standard for developing multitier, enterprise services.</p>

 <p class="anchor_topictop">The economy and technology of today have
 intensified the need for faster, more efficient, and larger-scale information
 management solutions. The J2EE specification satisfies these challenges by
 providing a programming model that improves development productivity, standardizes
 the platform for hosting enterprise applications, and ensures portability
 of developed applications with an extensive test suite.</p>

 <p>J2EE architecture supports component-based development of multi-tier enterprise
 applications. A J2EE application system typically includes the following tiers:</p>

 <ul>
 <li><strong>Client tier</strong>: In the client tier, Web components, such as Servlets
 and JavaServer Pages (JSPs), or standalone Java applications provide a dynamic interface
 to the middle tier.</li>

 <li><strong>Middle tier</strong>: In the server tier, or middle tier, enterprise beans
 and Web Services encapsulate reusable, distributable business logic for the
 application. These server-tier components are contained on a J2EE Application
 Server, which provides the platform for these components to perform actions
 and store data.</li>

 <li><strong>Enterprise data tier</strong>: In the data tier, the enterprise's data is
 stored and persisted, typically in a relational database.</li>

 </ul>

 <p>J2EE applications are comprised of components, containers, and services.
 Components are application-level components. Web components, such as Servlets
 and JSPs, provide dynamic responses to requests from a Web page. EJB components
 contain server-side business logic for enterprise applications. Web and EJB
 component containers host services that support Web and EJB modules.</p>

 <p>For more information on J2EE architecture and its implicit technologies,
 download and read the <a href="http://java.sun.com/j2ee/download.html#platformspec" target="_blank" title="">J2EE 1.4 Specification</a>.</p>

 <p class="anchor_topicbottom" />

 </div>

 <div><div class="relconcepts"><strong>Related concepts</strong><br />
 <div><a href="../topics/cjearproj.html" title="An enterprise application project ties together the resources that are required to deploy a J2EE enterprise application.">Enterprise application projects</a></div>
 <div><a href="../topics/cjappcliproj.html" title="">Application client projects</a></div>
 </div>
 <div class="reltasks"><strong>Related tasks</strong><br />
 <div><a href="../topics/tjear.html" title="">Creating an enterprise application project</a></div>
 <div><a href="../topics/tjimpear.html" title="Enterprise application projects are deployed into EAR files. You can import an enterprise application project by importing it from a deployed EAR file.">Importing an enterprise application EAR file</a></div>
 <div><a href="../topics/tjexpear.html" title="Enterprise applications are deployed in the form of an EAR file. Use the Export wizard to export an enterprise application project into an EAR file for deployment.">Exporting an enterprise application into an EAR file</a></div>
 <div><a href="../topics/tjappproj.html" title="You can use a wizard to create a new application client project and add it to a new or existing enterprise application project.">Creating an application client project</a></div>
 <div><a href="../topics/tjexpapp.html" title="You can export an application client project as a JAR file.">Exporting an application client project</a></div>
 <div><a href="../topics/tjimpapp.html" title="Application client projects are deployed as JAR files. You can import an application client project that has been deployed into a JAR file by using the Import wizard.">Importing an application client JAR file</a></div>
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	<title>J2EE architecture</title>
	</head>
	<body id="cjarch"><a name="cjarch"><!-- --></a>


	<h1 class="id_title">J2EE architecture</h1>



	<div class="id_conbody"><p class="id_shortdesc">The Java™ 2 Platform, Enterprise Edition (J2EE)
	provides a standard for developing multitier, enterprise services.</p>

	<p class="anchor_topictop">The economy and technology of today have
	intensified the need for faster, more efficient, and larger-scale information
	management solutions. The J2EE specification satisfies these challenges by
	providing a programming model that improves development productivity, standardizes
	the platform for hosting enterprise applications, and ensures portability
	of developed applications with an extensive test suite.</p>

	<p>J2EE architecture supports component-based development of multi-tier enterprise
	applications. A J2EE application system typically includes the following tiers:</p>

	<ul>
	<li><strong>Client tier</strong>: In the client tier, Web components, such as Servlets
	and JavaServer Pages (JSPs), or standalone Java applications provide a dynamic interface
	to the middle tier.</li>

	<li><strong>Middle tier</strong>: In the server tier, or middle tier, enterprise beans
	and Web Services encapsulate reusable, distributable business logic for the
	application. These server-tier components are contained on a J2EE Application
	Server, which provides the platform for these components to perform actions
	and store data.</li>

	<li><strong>Enterprise data tier</strong>: In the data tier, the enterprise's data is
	stored and persisted, typically in a relational database.</li>

	</ul>

	<p>J2EE applications are comprised of components, containers, and services.
	Components are application-level components. Web components, such as Servlets
	and JSPs, provide dynamic responses to requests from a Web page. EJB components
	contain server-side business logic for enterprise applications. Web and EJB
	component containers host services that support Web and EJB modules.</p>

	<p>For more information on J2EE architecture and its implicit technologies,
	download and read the <a href="http://java.sun.com/j2ee/download.html#platformspec" target="_blank" title="">J2EE 1.4 Specification</a>.</p>

	<p class="anchor_topicbottom" />

	</div>

	<div><div class="relconcepts"><strong>Related concepts</strong><br />
	<div><a href="../topics/cjearproj.html" title="An enterprise application project ties together the resources that are required to deploy a J2EE enterprise application.">Enterprise application projects</a></div>
	<div><a href="../topics/cjappcliproj.html" title="">Application client projects</a></div>
	</div>
	<div class="reltasks"><strong>Related tasks</strong><br />
	<div><a href="../topics/tjear.html" title="">Creating an enterprise application project</a></div>
	<div><a href="../topics/tjimpear.html" title="Enterprise application projects are deployed into EAR files. You can import an enterprise application project by importing it from a deployed EAR file.">Importing an enterprise application EAR file</a></div>
	<div><a href="../topics/tjexpear.html" title="Enterprise applications are deployed in the form of an EAR file. Use the Export wizard to export an enterprise application project into an EAR file for deployment.">Exporting an enterprise application into an EAR file</a></div>
	<div><a href="../topics/tjappproj.html" title="You can use a wizard to create a new application client project and add it to a new or existing enterprise application project.">Creating an application client project</a></div>
	<div><a href="../topics/tjexpapp.html" title="You can export an application client project as a JAR file.">Exporting an application client project</a></div>
	<div><a href="../topics/tjimpapp.html" title="Application client projects are deployed as JAR files. You can import an application client project that has been deployed into a JAR file by using the Import wizard.">Importing an application client JAR file</a></div>
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