JNDI data source

I'm trying to use a JNDI data source in CF 10. We used to do it in CF 8 in the JRun admin, and was able to use data sources across coldFusion and java code. Any ideas on how to make it work in CF 10? I've tried several online resources, setting up a resource in Context.xml:

  <Resource name="mydatasource" auth="Container" type="javax.sql.DataSource"

               maxActive="100" maxIdle="30" maxWait="10000"

               username="myuser" password="mypass" driverClassName="macromedia.jdbc.MacromediaDriver"

               url="jdbc:macromedia:sqlserver://127.0.0.1:1433;databaseName=mydb;SendStringParametersAsUnicode=false;SendStringAsUnicode=false"/>

then a resource-ref in web.xml

<resource-ref>

      <description>DB Connection</description>

      <res-ref-name>mydatasource</res-ref-name>

      <res-type>javax.sql.DataSource</res-type>

      <res-auth>Container</res-auth>

            </resource-ref>

but I'm getting errors

java.lang.IllegalArgumentException: Cannot convert value of type [jav

a.lang.String] to required type [javax.sql.DataSource] for property 'dataSource'

: no matching editors or conversion strategy found