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Using a Preconfigured DataSource

//web.xml <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"   "http://java.sun.com/dtd/web-app_2_3.dtd"> <web-app>   <resource-ref>     <res-ref-name>jdbc/address</res-ref-name>     <res-type>javax.sql.DataSource</res-type>     <res-auth>Container</res-auth>   </resource-ref> </web-app> <%@ taglib prefix="sql" uri="http://java.sun.com/jstl/sql" %> <%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %> <html> <head> <title>Using a Preconfigured DataSource</title> </head> <body> <h1>Address List</h1> <sql:query dataSource="jdbc/address" var="addresses">     SELECT * FROM AddressList </sql:query> <table width="90%" border="1"> <tr> <!-- add the table column headings --> <c:forEach var="columnName" items="${addresses.columnNames}">   <th> <c:out value="${columnName}"/> </th> </c:forEach> </tr> <!-- add the table rows from the result set --> <c:forEach var="row" items="${addresses.rowsByIndex}">   <tr>     <c:forEach var="column" items="${row}">       <td><c:out value="${column}"/></td>     </c:forEach>   </tr> </c:forEach> </table> </body> </html>