JNDI Datasource Problem on Tomcat 6, Hibernate

I am using Tomcat 6 as application server, Struts-Hibernate and MyEclipse 6.0.

My application uses JDBC driver but I should modify it to use JNDI Datasource. I followed steps as described in tomcat 6.0 howto tutorial.

I defined my resource in tomcat>conf:

    <Resource name="jdbc/ats" global="jdbc/ats" auth="Container"
          type="javax.sql.DataSource" driverClassName="oracle.jdbc.OracleDriver"
          url="jdbc:oracle:thin:@//localhost:1521/MISDEV"
          username="TEST" password="TEST" maxActive="20" maxIdle="10"
          maxWait="-1" validationQuery="SELECT 1 from dual" 
  removeAbandoned="true" 
          removeAbandonedTimeout="30" 
  logAbandoned="false"/>

I gave reference in my application web.xml:

 <resource-ref>
   <description>Oracle Datasource example</description>
   <res-ref-name>jdbc/ats</res-ref-name>
   <res-type>javax.sql.DataSource</res-type>
   <res-auth>Container</res-auth>
 </resource-ref>

And I defined datasource-dialect in my hibernate-cfg.xml

 <property name="connection.datasource">java:comp/env/jdbc/ats</property>
 <property name="dialect">org.hibernate.dialect.Oracle9Dialect</property>

But when I create hibernate session, it can not open the connection:

09:18:11,322 ERROR JDBCExceptionReporter:72 – Connections could not be acquired from the underlying database!
org.hibernate.exception.GenericJDBCException: Cannot open connection

I also tried to set the properties at runtime:

        Configuration configuration = new Configuration();        
    configuration.setProperty("hibernate.dialect", "org.hibernate.dialect.Oracle9Dialect");        
    //configuration.setProperty("hibernate.connection.datasource",  "java:comp/env/jdbc/ats");
    configuration.setProperty("hibernate.current_session_context_class", "thread");    
    configuration.setProperty("hibernate.connection.provider_class", "org.hibernate.connection.C3P0ConnectionProvider");
    configuration.setProperty("hibernate.show_sql", "true");         


    sessionFactory = configuration.configure().buildSessionFactory();

It does not open connection again.

But, when I use JDBC driver it works:

Configuration configuration = new Configuration();        
    configuration.setProperty("hibernate.dialect", "org.hibernate.dialect.Oracle9Dialect");        
    //configuration.setProperty("hibernate.connection.datasource",  "java:comp/env/jdbc/ats");
    configuration.setProperty("hibernate.connection.url", "jdbc:oracle:thin:@//localhost:1521/MISDEV");        
    configuration.setProperty("hibernate.connection.username", "test");        
    configuration.setProperty("hibernate.connection.password", "test");        
    configuration.setProperty("hibernate.connection.driver_class", "oracle.jdbc.OracleDriver");        
    configuration.setProperty("hibernate.transaction.factory_class", "org.hibernate.transaction.JDBCTransactionFactory");        
    configuration.setProperty("hibernate.current_session_context_class", "thread");    
    configuration.setProperty("hibernate.connection.provider_class", "org.hibernate.connection.C3P0ConnectionProvider");    
    configuration.setProperty("hibernate.show_sql", "true");         


    sessionFactory = configuration.configure().buildSessionFactory(); 

I have been searching for 3 days and no success. What may be de problem?

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