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It works fine for me. Are you sure, you used the right code? What does the following print:

     DataSource ds = (DataSource) new InitialContext().lookup("java:DefaultDS"); // replace this with your datasource deployed in JBoss
      con = ds.getConnection(); 
      System.out.println("Connection is " + con); 
      org.jboss.resource.adapter.jdbc.WrappedConnection wc = (WrappedConnection) con; 
      Connection uc = wc.getUnderlyingConnection(); 
      System.out.println("Underlying Connection is " + uc);