Tomcat 4 Tyrex DataSource Problems

[Dan Powell <Da...@Wellogic.com>]

I'm having some difficulty creating a DataSource using the default Tyrex
factory provided in Tomcat 4.  In the DefaultContext, I have:
 
              <ResourceParams name="jdbc/SomeDB">
                  <parameter>
                      <name>user</name>
                      <value>username</value>
                  </parameter>
                  <parameter>
                      <name>password</name>
                      <value>pass</value>
                  </parameter>
                  <parameter>
                      <name>driverClassName</name>
                      <value>com.jnetdirect.jsql.JSQLDriver</value>
                  </parameter>
                  <parameter>
                      <name>driverName</name>
 
<value>jdbc:JSQLConnect://dbhost/database=somedata</value>
                  </parameter>
              </ResourceParams>
 
And in my code I:
 
            Context initCtx = new InitialContext();
            Context envCtx = (Context) initCtx.lookup("java:comp/env");
            DataSource ds = (DataSource) envCtx.lookup("jdbc/SomeDB");
            Connection conn = ds.getConnection();
 
However, at runtime, I get the following error on the third line of the
above code fragment:
 
        java.lang.ClassCastException: tyrex.jdbc.xa.EnabledDataSource
 
I do not have the Tyrex jar in my classpath at compile time, and I don't
believe I should have to.  Is this a problem with Tomcat, Tyrex, or
something I'm doing?
 
Thanks for your help, in advance,
 
--
J. Daniel Powell
Sr. Systems Architect
Wellogic, Inc.