Configuring an oracle connection for OAS 10.1.3 and Hibernate 3

Hi -
We have an  application that deploys to JBoss - no problem.  It uses Hibernate3 and Oracle 10.  I have been trying to get it to deploy properly to OAS 10.1.3.   I got around some issues with antlr etc by telling the classloader to load our war lib first.

 My remaining problem is getting the connection to work.   I have tried googling the problem, and also read over the documentation about OC4J's datasources for 10.1.3.  

Hibernate finds the xml and configures it.  But when it goes to create a session it gives a class cast exception for the datasource.  I have hibernate3.jar and the ojdbc14.jar in my WEB-INF/lib.
   Caused by: java.lang.ClassCastException: oracle.jdbc.pool.OracleDataSource

I can test the datasource deployed for the app in the console and it works.

Below are relevant portions of hibernate cfg xml, data-sources.xml and the stack trace.

(Any help is appreciated.  I have tried using ManagedDataSource too with connection pool but that seems like I'm going down the wrong path.)

Hibernate cfg xml portion
--------------------------
      <session-factory>
            <property name="hibernate.connection.datasource">
                  java:/mydb
            </property>
            <property name="connection.driver_class">
                  oracle.jdbc.driver.OracleDriver
            </property>
            <property name="dialect">
                  org.hibernate.dialect.Oracle9Dialect
            </property>
            <property name="hibernate.connection.autocommit">
                  false
            </property>
            <property name="hibernate.default_schema">ES</property>
            <property name="hibernate.max_fetch_depth">3</property>
            <property name="hibernate.jdbc.batch_size">0</property>
            <property name="cache.use_query_cache">false</property>


Here is the data-sources.xml   (with name and passwd left blank to protect the innocent)

<?xml version="1.0" encoding="UTF-8" ?>
<data-sources>
      <native-data-source
             name="MyNameds"
             jndi-name="java:/mydb"
             description="Native DataSource"
             data-source-class="oracle.jdbc.pool.OracleDataSource"
             user="...."
             password="...."
             url="jdbc:oracle:thin:@mytestserver:1521:orcl">
      </native-data-source>
</data-sources>


And the stack trace when it tries to open the Hibernate session
---------------------------------------------------------


org.hibernate.HibernateException: Could not find datasource
      at org.hibernate.connection.DatasourceConnectionProvider.configure(DatasourceConnectionProvider.java:56)
      at org.hibernate.connection.ConnectionProviderFactory.newConnectionProvider(ConnectionProviderFactory.java:124)
      at org.hibernate.connection.ConnectionProviderFactory.newConnectionProvider(ConnectionProviderFactory.java:56)
      at org.hibernate.cfg.SettingsFactory.createConnectionProvider(SettingsFactory.java:366)
      at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:60)
      at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:1881)
      at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1174)
      at com.escholar.hibernate.HibernateSessionFactory.rebuildSessionFactory(HibernateSessionFactory.java:95)
      at com.escholar.hibernate.HibernateSessionFactory.getSession(HibernateSessionFactory.java:49)
      at com.escholar.servlets.WSAppLoaderServlet.Initiallize(WSAppLoaderServlet.java:155)
      at com.escholar.servlets.WSAppLoaderServlet.init(WSAppLoaderServlet.java:112)
      at javax.servlet.GenericServlet.init(GenericServlet.java:256)
      at com.evermind.server.http.HttpApplication.loadServlet(HttpApplication.java:2361)
      at com.evermind.server.http.HttpApplication.findServlet(HttpApplication.java:4810)
      at com.evermind.server.http.HttpApplication.findServlet(HttpApplication.java:4734)
      at com.evermind.server.http.HttpApplication.initPreloadServlets(HttpApplication.java:4922)
      at com.evermind.server.http.HttpApplication.initDynamic(HttpApplication.java:1134)
      at com.evermind.server.http.HttpApplication.<init>(HttpApplication.java:738)
      at com.evermind.server.ApplicationStateRunning.getHttpApplication(ApplicationStateRunning.java:414)
      at com.evermind.server.Application.getHttpApplication(Application.java:545)
      at com.evermind.server.http.HttpSite$HttpApplicationRunTimeReference.createHttpApplicationFromReference(HttpSite.java:1990)
      at com.evermind.server.http.HttpSite$HttpApplicationRunTimeReference.<init>(HttpSite.java:1909)
      at com.evermind.server.http.HttpSite.addHttpApplication(HttpSite.java:1606)
      at oracle.oc4j.admin.internal.WebApplicationBinder.bindWebApp(WebApplicationBinder.java:238)
      at oracle.oc4j.admin.internal.WebApplicationBinder.bindWebApp(WebApplicationBinder.java:99)
      at oracle.oc4j.admin.internal.ApplicationDeployer.bindWebApp(ApplicationDeployer.java:547)
      at oracle.oc4j.admin.internal.ApplicationDeployer.doDeploy(ApplicationDeployer.java:202)
      at oracle.oc4j.admin.internal.DeployerBase.execute(DeployerBase.java:93)
      at oracle.oc4j.admin.jmx.server.mbeans.deploy.OC4JDeployerRunnable.doRun(OC4JDeployerRunnable.java:52)
      at oracle.oc4j.admin.jmx.server.mbeans.deploy.DeployerRunnable.run(DeployerRunnable.java:81)
      at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:298)
      at java.lang.Thread.run(Thread.java:595)
Caused by: java.lang.ClassCastException: oracle.jdbc.pool.OracleDataSource
      at org.hibernate.connection.DatasourceConnectionProvider.configure(DatasourceConnectionProvider.java:52)
      ... 31 more