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| <h1 class="topictitle1">Message-driven Beans</h1> |
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| <div><p /> |
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| <p>A <strong>message-driven bean</strong> is an enterprise bean that allows Java™ EE |
| applications to process messages asynchronously. It acts as a Java Message |
| Service (JMS) message listener, which is similar to an event listener except |
| that it receives messages instead of events. The messages may be sent by any Java EE |
| component - an application client, another enterprise bean, or a Web component |
| - or by a JMS application or system that does not use Java EE |
| technology.</p> |
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| <p>In JMS, a message is a Java object with two parts: a <strong>header</strong> and |
| a <strong>body</strong>. The header is composed of delivery information and metadata. |
| The message body carries the application data, which can take several forms: |
| text, serializable objects, byte streams, etc. The JMS API defines several |
| message types (<strong>TextMessage, MapMessage, ObjectMessage</strong>, and others) |
| and provides methods for delivering messages to and receiving messages from |
| other applications.</p> |
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| <div class="familylinks"> |
| <div class="parentlink"><strong>Parent topic:</strong> <a href="../topics/messbwiz.html" title="You can use a wizard to create a message-driven bean and add it to your project.">Creating Message-driven Beans</a></div> |
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