i am new to DataSource and Connection Pool,
i am trying to get a connection pool from the datasource i follwoed the instructions posted on jakarta web site:
http://jakarta.apache.org/tomcat/tomcat-4.1-doc/jndi-datasource-examples-howto.html
 but i am getting error:
javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file: java.naming.factory.initial

i am sure my java code:
InitialContext ctx = new InitialContext();
              
              if(ctx == null )
              System.out.println(" no context");
              System.out.println(" good context");
              DataSource ds = (DataSource)ctx.lookup("java:comp/env/jdbc/TestDB");
              
              if (ds != null) {
                 System.out.println(ds);
                conn = ds.getConnection();
              }
        } catch (NamingException ex) {
              ex.printStackTrace();
        }catch (SQLException e) {
               e.getMessage();
               e.printStackTrace();
        }
my web.xml :
  <resource-ref>
      <description>DB Connection</description>
      <res-ref-name>jdbc/TestDB</res-ref-name>
      <res-type>javax.sql.DataSource</res-type>
      <res-auth>Container</res-auth>
  </resource-ref>
  

but i am not sure if i have to add an <environment> tag to the server.xml (See the link above) if i do plz show me an example .
if any body has experience with this problem plz help me.

http://forum.java.sun.com/thread.jspa?threadID=467376&messageID=2151261


here's my setup:

<Server>
...
  <GlobalNamingResources>
...
    <Resource name="jdbc/foo" type="javax.sql.DataSource"/>
...
    <ResourceParams name="jdbc/foo">
      <parameter>
        <name>url</name>
        <value>jdbc:mysql://localhost/foo</value>
      </parameter>
      <parameter>
        <name>username</name>
        <value>user</value>
      </parameter>
      <parameter>
        <name>password</name>
        <value>pass</value>
      </parameter>
      <parameter>
        <name>driverClassName</name>
        <value>com.mysql.jdbc.Driver</value>
      </parameter>
      <parameter>
... [other db connection info]

datasource jndi name (I use hibernate, so can't help you with the context):
java:comp/env/jdbc/foo