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 <h1 class="topictitle1">Session Beans</h1>


 <div><p />

 <p>A <strong>session bean</strong> is a type of enterprise bean. It is created by a
 client and usually exists only for the duration of a single client-server
 session.</p>

 <p>Session beans are useful for describing interactions between other beans
 (taskflow) and for implementing particular tasks. They do not represent data
 in the database, but they can access data, so we can use session beans to
 read, update, and insert data in a business process. Session beans access
 data that spans concepts, is not shared, and is usually read-only. Session
 beans contain business logic, and entities model persistent data. Session
 beans are divided in two types: stateless session beans and stateful session
 beans.</p>

 <ul>
 <li><strong>Stateless session beans</strong> <p>A stateless session bean is pooled by
 the container to handle multiple requests from multiple clients and does not
 maintain any conversational state.</p>
  </li>

 <li> <strong>Stateful session beans</strong> <p>A stateful session bean acts on behalf
 of a single client and maintains client-specific session information (called
 conversational state) across multiple method calls and transactions. It exists
 for the duration of a single client/server session.</p>
  </li>

 </ul>

 </div>

 <div>
 <div class="familylinks">
 <div class="parentlink"><strong>Parent topic:</strong> <a href="../topics/sessbwiz.html" title="You can use a wizard to create a session bean and add it to your project.">Creating EJB Session Beans</a></div>
 </div>
 </div>

 </body>
 </html>
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	<title>Session Beans</title>
	</head>
	<body id="sessb"><a name="sessb"><!-- --></a>


	<h1 class="topictitle1">Session Beans</h1>



	<div><p />

	<p>A <strong>session bean</strong> is a type of enterprise bean. It is created by a
	client and usually exists only for the duration of a single client-server
	session.</p>

	<p>Session beans are useful for describing interactions between other beans
	(taskflow) and for implementing particular tasks. They do not represent data
	in the database, but they can access data, so we can use session beans to
	read, update, and insert data in a business process. Session beans access
	data that spans concepts, is not shared, and is usually read-only. Session
	beans contain business logic, and entities model persistent data. Session
	beans are divided in two types: stateless session beans and stateful session
	beans.</p>

	<ul>
	<li><strong>Stateless session beans</strong> <p>A stateless session bean is pooled by
	the container to handle multiple requests from multiple clients and does not
	maintain any conversational state.</p>
	</li>

	<li> <strong>Stateful session beans</strong> <p>A stateful session bean acts on behalf
	of a single client and maintains client-specific session information (called
	conversational state) across multiple method calls and transactions. It exists
	for the duration of a single client/server session.</p>
	</li>

	</ul>

	</div>

	<div>
	<div class="familylinks">
	<div class="parentlink"><strong>Parent topic:</strong> <a href="../topics/sessbwiz.html" title="You can use a wizard to create a session bean and add it to your project.">Creating EJB Session Beans</a></div>
	</div>
	</div>

	</body>
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