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<?xml version="1.0" encoding="ISO-8859-1"?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">  <head>    <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />    <meta http-equiv="Content-Style-Type" content="text/css" />    <title>JNDI Naming</title>    <link rel="StyleSheet" href="document.css" type="text/css" media="all" />    <link rel="StyleSheet" href="catalog.css" type="text/css" media="all" />    <link rel="Table of Contents" href="J2EETutorialTOC.html" />    <link rel="Previous" href="Resources.html" />    <link rel="Next" href="Resources3.html" />    <link rel="Index" href="J2EETutorialIX.html" />  </head>  <body>    <table width="550" summary="layout" id="SummaryNotReq1">      <tr>	<td align="left" valign="center">	<font size="-1">	<a href="http://java.sun.com/j2ee/1.4/download.html#tutorial" target="_blank">Download</a>	<br>	<a href="http://java.sun.com/j2ee/1.4/docs/tutorial/information/faq.html" target="_blank">FAQ</a>	<br>	<a href="http://java.sun.com/j2ee/1.4/docs/tutorial/information/history.html" target="_blank">History</a>	</td>        <td align="center" valign="center"><a accesskey="p" href="Resources.html"><img id="LongDescNotReq1" src="images/PrevArrow.gif" width="26" height="26" border="0" alt="Prev" /></a><a accesskey="c" href="J2EETutorialFront.html"><img id="LongDescNotReq1" src="images/UpArrow.gif" width="26" height="26" border="0" alt="Home" /></a><a accesskey="n" href="Resources3.html"><img id="LongDescNotReq3" src="images/NextArrow.gif" width="26" height="26" border="0" alt="Next" /></a><a accesskey="i" href="J2EETutorialIX.html"></a>        </td>	<td align="right" valign="center">	<font size="-1">	<a href="http://java.sun.com/j2ee/1.4/docs/api/index.html" target="_blank">API</a>	<br>	<a href="http://java.sun.com/j2ee/1.4/docs/tutorial/information/search.html" target="_blank">Search</a>	<br>	<a href="http://java.sun.com/j2ee/1.4/docs/tutorial/information/sendusmail.html" target="_blank">Feedback</a></font>	</font>	</td>      </tr>    </table>    <img src="images/blueline.gif" width="550" height="8" ALIGN="BOTTOM" NATURALSIZEFLAG="3" ALT="Divider">    <blockquote><a name="wp80078"> </a><h2 class="pHeading1">JNDI Naming</h2><a name="wp80079"> </a><p class="pBody">In a distributed application, components need to access other components and resources such as databases. For example, a servlet might invoke remote methods on an enterprise bean that retrieves information from a database. In the J2EE platform, the Java Naming and Directory Interface (JNDI) naming service enables components to locate other components and resources. To locate a JDBC resource, for example, an enterprise bean invokes the JNDI <code class="cCode">lookup</code> method. The JNDI naming service maintains a set of bindings that relate names to objects. The <code class="cCode">lookup</code> method passes a JNDI name parameter and returns the related object.</p><a name="wp80331"> </a><p class="pBody">For detailed information about JNDI, see the JNDI Tutorial:</p><div class="pPreformattedRelative"><pre class="pPreformattedRelative"><a  href="http://java.sun.com/products/jndi/tutorial" target="_blank">http://java.sun.com/products/jndi/tutorial</a><a name="wp80333"> </a></pre></div><a name="wp80305"> </a><p class="pBody">JNDI provides a naming context, which is a a set of name-to-object bindings. All naming operations are relative to a context. A name that is bound within a context is the JNDI name of the object. In <a  href="Resources4.html#wp79715">Specifying a Resource Reference</a>, for example, the JNDI name for the JDBC resource (or data source) is <code class="cCode">jdbc/ejbTutorialDB</code>. A <code class="cCode">Context</code> object provides the methods for binding names to objects, unbinding names from objects, renaming objects, and listing the bindings. JNDI also provides subcontext functionality. Much like a directory in a file system, a subcontext is a context within a context. This hierarchical structure permits better organization of information. For naming services that support subcontexts, the <code class="cCode">Context</code> class also provides methods for creating and destroying subcontexts. <a  href="Resources2.html#wp81905">Table 26-1</a> describes JNDI subcontexts for connection factories in the J2EE Application Server.</p><div align="left"><table border="1" summary="JNDI Subcontexts for Connection Factories" id="wp81905">  <caption><a name="wp81905"> </a><div class="pTableTitle">Table 26-1   JNDI Subcontexts for Connection Factories&nbsp;</div></caption>  <tr align="center">    <th><a name="wp81911"> </a><div class="pCellHeading">Resource Manager Type</div></th>    <th><a name="wp81913"> </a><div class="pCellHeading">Connection Factory Type</div></th>    <th><a name="wp81915"> </a><div class="pCellHeading">JNDI Subcontext</div></th></tr>  <tr align="left">    <td><a name="wp81917"> </a><div class="pCellBody">JDBC</div></td>    <td><a name="wp81919"> </a><div class="pCellBody"><code class="cCode">javax.sql.DataSource</code></div></td>    <td><a name="wp81921"> </a><div class="pCellBody"><code class="cCode">java:comp/env/jdbc</code></div></td></tr>  <tr align="left">    <td><a name="wp81923"> </a><div class="pCellBody">JMS</div></td>    <td><a name="wp81925"> </a><div class="pCellBody"><code class="cCode">javax.jms.TopicConnectionFactory</code></div><a name="wp81926"> </a><div class="pCellBody"><code class="cCode">javax.jms.QueueConnectionFactory</code></div></td>    <td><a name="wp81928"> </a><div class="pCellBody"><code class="cCode">java:comp/env/jms</code></div></td></tr>  <tr align="left">    <td><a name="wp81930"> </a><div class="pCellBody">JavaMail</div></td>    <td><a name="wp81932"> </a><div class="pCellBody"><code class="cCode">javax.mail.Session</code></div></td>    <td><a name="wp81934"> </a><div class="pCellBody"><code class="cCode">java:comp/env/mail</code></div></td></tr>  <tr align="left">    <td><a name="wp81936"> </a><div class="pCellBody">URL</div></td>    <td><a name="wp81938"> </a><div class="pCellBody"><code class="cCode">java.net.URL</code></div></td>    <td><a name="wp81940"> </a><div class="pCellBody"><code class="cCode">java:comp/env/url</code></div></td></tr>  <tr align="left">    <td><a name="wp81942"> </a><div class="pCellBody">Connector</div></td>    <td><a name="wp81944"> </a><div class="pCellBody"><code class="cCode">javax.resource.cci.ConnectionFactory</code></div></td>    <td><a name="wp81946"> </a><div class="pCellBody"><code class="cCode">java:comp/env/eis</code></div></td></tr>  <tr align="left">    <td><a name="wp81967"> </a><div class="pCellBody">JAXR Resource Adapter</div></td>    <td><a name="wp81969"> </a><div class="pCellBody"><code class="cCode">javax.xml.registry.ConnectionFactory</code></div></td>    <td><a name="wp81971"> </a><div class="pCellBody"><code class="cCode">java:comp/env/eis/JAXR</code></div></td></tr></table></div><p class="pBody"></p><hr><a name="wp80086"> </a><p class="pNote">Note: To avoid collisions with names of other enterprise resources in JNDI, and to avoid portability problems, all names in a J2EE Application Server application should begin with the string <code class="cCode">java:comp/env</code>.</p><hr>    </blockquote>   <img src="images/blueline.gif" width="550" height="8" ALIGN="BOTTOM" NATURALSIZEFLAG="3" ALT="Divider">    <table width="550" summary="layout" id="SummaryNotReq1">      <tr>	<td align="left" valign="center">	<font size="-1">	<a href="http://java.sun.com/j2ee/1.4/download.html#tutorial" target="_blank">Download</a>	<br>	<a href="http://java.sun.com/j2ee/1.4/docs/tutorial/information/faq.html" target="_blank">FAQ</a>	<br>	<a href="http://java.sun.com/j2ee/1.4/docs/tutorial/information/history.html" target="_blank">History</a>	</td>        <td align="center" valign="center"><a accesskey="p" href="Resources.html"><img id="LongDescNotReq1" src="images/PrevArrow.gif" width="26" height="26" border="0" alt="Prev" 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