error connecting to a Datasource in weblogic

I have a Datasource created in Weblogic but when I invoke it from a class, it generates the error:

  

javax.naming.NamingException: Lookup failed for 'jdbc / ConexionFV' in   SerialContext [myEnv = {java.naming.provider.url = t3: //127.0.0.1: 7001,   java.naming.factory.initial = weblogic.jndi.WLInitialContextFactory,   java.naming.factory.state = com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl,   java.naming.factory.url.pkgs = com.sun.enterprise.naming} [Root   exception is javax.naming.NameNotFoundException: ConexionFV not found]

If someone can guide me to understand what I am doing wrong, I would greatly appreciate the help ... this is my code.

    private static InitialContext ctx = null;
//public static InitialContext getInitialContext( ) throws NamingException {
public static synchronized Connection getConexion() {
   Context ctx = null;
   Hashtable ht = new Hashtable();
   ht.put(Context.INITIAL_CONTEXT_FACTORY,"weblogic.jndi.WLInitialContextFactory");
   ht.put(Context.PROVIDER_URL,"t3://127.0.0.1:7001");//hostname:port");
   Connection conn = null;
   Statement stmt = null;
   ResultSet rs = null;
   try {
     ctx = new InitialContext(ht);
     javax.sql.DataSource ds = (javax.sql.DataSource) ctx.lookup ("jdbc/ConexionFV");
     conn = ds.getConnection();
   }catch (Exception e) {
     System.out.println("Error --> " + e);
     conn = null;
   }
   return conn;
}