How to call an Oracle function from Hibernate with a return parameter?

Question

My question is very much like Getting the return value of a PL/SQL function via Hibernate

I have a function which does some modifications internally and it returns a

Answer 1

public static void getThroHibConnTest() throws Exception {
    logger.debug("UsersActiion.getThroHibConnTest() | BEG ");
    Transaction tx = null;
    Connection conn = null;
    CallableStatement cs = null;
    Session session = HibernateUtil.getInstance().getCurrentSession();
    try {
        tx = session.beginTransaction();
        conn = session.connection();

        System.out.println("Connection = "+conn);
        if (cs == null)
        {
            cs = 
                conn.prepareCall("{ ?=call P_TEST.FN_GETSUM(?,?) }");
        }
        cs.clearParameters();
        cs.registerOutParameter(1,OracleTypes.INTEGER);
        cs.setInt(2,1);
        cs.setInt(3,2);
        cs.execute();
        int retInt=cs.getInt(1);
        tx.commit();            
    }catch (Exception ex) {  
        logger.error("UsersActiion.getThroHibConnTest() | ERROR | " , ex);  
        if (tx != null && tx.isActive()) {
            try {
                // Second try catch as the rollback could fail as well
                tx.rollback();
            } catch (HibernateException e1) {
                logger.debug("Error rolling back transaction");
            }
            // throw again the first exception
            throw ex;
        }
    }finally{
        try {
            if (cs != null) {
                cs.close();
                cs = null;
            }
            if(conn!=null)conn.close();

        } catch (Exception ex){;}
    }
    logger.debug("UsersActiion.getThroHibConnTest() | END ");
}