JNDI configure question

I use tomcat 5.5.16,and my database is Microsoft Access 2000,and I have
configured ODBC as SMS in windows,then I configure JNDI like follows:

/*\tomcat\conf\server.xml*/
<Host name="localhost" appBase="webapps"
unpackWARs="true" autoDeploy="true"
xmlValidation="false" xmlNamespaceAware="false">
<Context path="/" docBase=""
debug="5" reloadable="true" crossContext="true">
<Resource name="jdbc/abc" auth="Container"
type="javax.sql.DataSource" driverClassName="
sun.jdbc.odbc.JdbcOdbcDriver"
url="jdbc:odbc:SMS"
username="administrator" password="123" maxActive="20"
maxIdle="10" maxWait="-1"/>
</Context>
</Host>

/*\tomcat\webapps\test\WEB-INF\web.xml*/
<?xml version="1.0" encoding="ISO-8859-1"?>

<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
version="2.4">

<display-name>Welcome to Tomcat</display-name>
<description>
Welcome to Tomcat
</description>



<servlet>
<servlet-name>org.apache.jsp.index_jsp</servlet-name>
<servlet-class>org.apache.jsp.index_jsp</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>org.apache.jsp.index_jsp</servlet-name>
<url-pattern>/index.jsp</url-pattern>
</servlet-mapping>
<resource-ref>
<description>DB Connection</description>
<res-ref-name>jdbc/abc</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>


</web-app>

My jsp file is follows:
<%@(protected).*"%>
<%@(protected)"%>
<%@(protected).*"%>
<html>
<body>
<%
try{
Context initCtx=new InitialContext();
System.out.println("ok1");
DataSource db = (DataSource)initCtx.lookup("java:comp/env/jdbc/abc");
System.out.println("db="+db);
Connection conn = db.getConnection();
System.out.println("conn="+conn);
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("SELECT * FROM abc");
out.println("User-list"+"<br>");
while(rs.next()){
out.print(rs.getString(1)+"<br>");
}
rs.close();
stmt.close();
conn.close();
}catch(Exception e){
out.print(e);
}
%>
</body>
</html>

When I run my jsp,it raise following error:
org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC driver of
class '' for connect URL 'null'

I want to know where is error? How to correct it?

JNDI configure question

red phoenix

2006-04-03