docs/org.eclipse.jst.j2ee.doc.user/topics/cannotations.html - gerrit/jeetools/webtools.javaee - Git at Google

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 <h1 class="id_title">Java EE 5 support for annotations</h1>


 <div><p class="id_shortdesc">The goal of Java™ EE 5 platform development is to minimize
 the number of artifacts that you have to create and maintain, thereby simplifying
 the development process. Java EE 5 supports the injection of annotations
 into your source code, so that you can embed resources, dependencies, services,
 and life-cycle notifications in your source code, without having to maintain
 these artifacts elsewhere.</p>

 <p>An annotation is a modifier or Metadata tag that provides additional data
 to Java classes,
 interfaces, constructors, methods, fields, parameters, and local variables.
 Annotations replace boilerplate code, common code that is required by certain
 applications. For example, an annotation can replace the paired interface
 and implementation required for a Web service. Annotations can also replace
 additional files that programs require, which are maintained separately. By
 using an annotation, this separate file is no longer required. For example,
 annotations can replace the need for a separately maintained deployment descriptor
 for JavaBeans™. </p>

 <div class="p">Annotations<ul>
 <li>Replace descriptors for most purposes</li>

 <li>Remove the need for marker interfaces (like java.rmi.Remote)</li>

 <li>Allow application settings to be visible in the component they affect</li>

 </ul>
 </div>

 <div class="p">Java EE 5 provides annotations for the following tasks, among others:<ul>
 <li>Developing Enterprise JavaBean applications</li>

 <li>Defining and using Web services</li>

 <li>Mapping Java technology classes to XML</li>

 <li>Mapping Java technology classes to databases</li>

 <li>Mapping methods to operations</li>

 <li>Specifying external dependencies</li>

 <li>Specirying deployment information, including security attributes</li>

 </ul>
 </div>

 <div class="p">Java EE
 5 defines a number of annotations that can be injected into your source code.
 To declare an annotation, you simply precede the keyword with an "at" sign
 (@). <pre>
 package com.ibm.counter;

 import javax.ejb.Stateless;

 @Stateless

 public class CounterBean {

 }</pre>
 </div>

 <p>For more information about the categories of annotations that Java EE
 5 supports, see <a href="ctypesofanno.html">Types of annotations</a>.</p>

 </div>

 <div>
 <ul class="ullinks">
 <li class="ulchildlink"><strong><a href="../topics/tdefiningannotations.html">Defining and using annotations</a></strong><br />
 You can use the @Interface annotation to define your own annotation definition.</li>
 </ul>

 <div class="familylinks">
 <div class="parentlink"><strong>Parent topic:</strong> <a href="../topics/cjavaee5.html" title="The Java EE 5 programming model simplifies the process of creating Java applications.">Developing Java EE 5 Applications</a></div>
 </div>
 </div>

 </body>
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	<title>Java EE 5 support for annotations</title>
	</head>
	<body id="cjavaee5"><a name="cjavaee5"><!-- --></a>


	<h1 class="id_title">Java EE 5 support for annotations</h1>



	<div><p class="id_shortdesc">The goal of Java™ EE 5 platform development is to minimize
	the number of artifacts that you have to create and maintain, thereby simplifying
	the development process. Java EE 5 supports the injection of annotations
	into your source code, so that you can embed resources, dependencies, services,
	and life-cycle notifications in your source code, without having to maintain
	these artifacts elsewhere.</p>

	<p>An annotation is a modifier or Metadata tag that provides additional data
	to Java classes,
	interfaces, constructors, methods, fields, parameters, and local variables.
	Annotations replace boilerplate code, common code that is required by certain
	applications. For example, an annotation can replace the paired interface
	and implementation required for a Web service. Annotations can also replace
	additional files that programs require, which are maintained separately. By
	using an annotation, this separate file is no longer required. For example,
	annotations can replace the need for a separately maintained deployment descriptor
	for JavaBeans™. </p>

	<div class="p">Annotations<ul>
	<li>Replace descriptors for most purposes</li>

	<li>Remove the need for marker interfaces (like java.rmi.Remote)</li>

	<li>Allow application settings to be visible in the component they affect</li>

	</ul>
	</div>

	<div class="p">Java EE 5 provides annotations for the following tasks, among others:<ul>
	<li>Developing Enterprise JavaBean applications</li>

	<li>Defining and using Web services</li>

	<li>Mapping Java technology classes to XML</li>

	<li>Mapping Java technology classes to databases</li>

	<li>Mapping methods to operations</li>

	<li>Specifying external dependencies</li>

	<li>Specirying deployment information, including security attributes</li>

	</ul>
	</div>

	<div class="p">Java EE
	5 defines a number of annotations that can be injected into your source code.
	To declare an annotation, you simply precede the keyword with an "at" sign
	(@). <pre>
	package com.ibm.counter;

	import javax.ejb.Stateless;

	@Stateless

	public class CounterBean {

	}</pre>
	</div>

	<p>For more information about the categories of annotations that Java EE
	5 supports, see <a href="ctypesofanno.html">Types of annotations</a>.</p>

	</div>

	<div>
	<ul class="ullinks">
	<li class="ulchildlink"><strong><a href="../topics/tdefiningannotations.html">Defining and using annotations</a></strong><br />
	You can use the @Interface annotation to define your own annotation definition.</li>
	</ul>

	<div class="familylinks">
	<div class="parentlink"><strong>Parent topic:</strong> <a href="../topics/cjavaee5.html" title="The Java EE 5 programming model simplifies the process of creating Java applications.">Developing Java EE 5 Applications</a></div>
	</div>
	</div>

	</body>
	</html>