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 <title>J2EE architecture</title>
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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 applications.</p>

 <p class="anchor_topictop" />

 <p>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>

 <dl>
 <dt class="dlterm">Client tier</dt>

 <dd>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.</dd>


 <dt class="dlterm">Middle tier</dt>

 <dd>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.</dd>


 <dt class="dlterm">Enterprise data tier</dt>

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

 </dl>

 <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 contain programs that run on networked client systems so the project can benefit from a server's tools.">Application client projects</a></div>
 </div>
 <div class="reltasks"><strong>Related tasks</strong><br />
 <div><a href="../topics/tjear.html" title="Using the wizard to create an enterprise application project allows you to package many web applications and modules in a project and deploy these modules as a J2EE enterprise application.">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>
 </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 applications.</p>

	<p class="anchor_topictop" />

	<p>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>

	<dl>
	<dt class="dlterm">Client tier</dt>

	<dd>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.</dd>


	<dt class="dlterm">Middle tier</dt>

	<dd>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.</dd>


	<dt class="dlterm">Enterprise data tier</dt>

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

	</dl>

	<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 contain programs that run on networked client systems so the project can benefit from a server's tools.">Application client projects</a></div>
	</div>
	<div class="reltasks"><strong>Related tasks</strong><br />
	<div><a href="../topics/tjear.html" title="Using the wizard to create an enterprise application project allows you to package many web applications and modules in a project and deploy these modules as a J2EE enterprise application.">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>
	</div>
	</div>

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