datasource issue - Mailing list pgsql-jdbc

I ran into jdbc driver not being found by tomcat issue, which I solved by
putting pg73jdbc3.jar in common/lib in tomcat. Now I am trying to look up
a data source through JNDI in my servlet and jstl-jsp both, but it is
failing in both cases. Assuming that it has got to do with the drivers not
being found, I have tried the following:
1. put the drivers in common/lib, server/lib, shared/lib and of course
WEB-INF/lib
2. put the drivers in java_home/lib/ext
3. add the drivers explicitly in catalina.sh

None if this worked, though I managed to change the error message from 'No
suitable driver' to 'Cannot load JDBC driver class 'null''.

I have followed the instructions from tomcat site to create my datasource,
and to modify my web.xml appropriately.
http://jakarta.apache.org/tomcat/tomcat-4.1-doc/jndi-datasource-examples-howto.html

I am using tomcat4.0.1, jdk1.4.1_01, red hat 8.0, jstl 1.0 implementation
from sun, postgresql 7.3.2 with jdbc drivers pg73jdbc3.jar.

Any help on this issue will be appreciated.

Thanks,
Tanu

ps: Tony, I did change the db url to what you suggested, but that did not
make a difference.

Here is the error snippet I get:
java.sql.SQLException: Cannot load JDBC driver class 'null'
        at
org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:529)
        at
org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:312)
        at TestServlet.doGet(TestServlet.java:52)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)

Code snippet from Servlet:
            Context initCtx = new InitialContext();
            Context envCtx = (Context) initCtx.lookup("java:comp/env");
            DataSource ds = (DataSource)envCtx.lookup("jdbc/test");
            Connection conn = ds.getConnection();

            Statement st = conn.createStatement();
            ResultSet rs = st.executeQuery(CATEGORY_SQL);
            while(rs.next()) {
                // get stuff
            }

Code snippet from jsp:
<sql:setDataSource
  var="example"
  dataSource="jdbc/test"
/>

<sql:transaction dataSource="${example}">
  <sql:query var="deejays">
    SELECT name, description FROM category
  </sql:query>
</sql:transaction>


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