Generic method to get oracle sequence nextval using hibernate

To get a sequence nextval in oracle using Hibernate

 
public static BigDecimal getSequenceNextVal(String sequenceName) {
  return (BigDecimal)HibernateUtils.getSession().createSQLQuery("select "+sequenceName+".NEXTVAL as id from dual").addScalar("id").uniqueResult();
 }

where HibernateUtils is the following class

import java.util.ArrayList;

import java.util.List;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.MetadataSources;
import org.hibernate.boot.registry.StandardServiceRegistry;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import tn.cnss.referentiel.models.Assure;
import tn.cnss.referentiel.models.Beneficiaire;


public class HibernateUtils {
 private static final SessionFactory sessionFactory;



 static {
  try {
  StandardServiceRegistry standardRegistry = 
  new StandardServiceRegistryBuilder().configure("hibernate.cfg.xml").build();
  
  //Annotated  classes to be scanned
  List<Class<?>> classes = new ArrayList<Class<?>>();
  classes.add(YYYYYYYYYYYYY.class);
  classes.add(XXXXXXXXXXXXX.class);
  
  //Attach classes 
  MetadataSources metadataSources = new MetadataSources(standardRegistry);
  for (Class<?> annotatedClass : classes) {
      metadataSources.addAnnotatedClass(annotatedClass);
  }

  sessionFactory = metadataSources.buildMetadata()
      .buildSessionFactory();

  } catch (Throwable th) {

   System.err.println("Enitial SessionFactory creation failed" + th);
   throw new ExceptionInInitializerError(th);

  }
 }
 public static SessionFactory getSessionFactory() {

  return sessionFactory;

 }
 public static Session getSession() throws org.hibernate.HibernateException {
     SessionFactory sessionFactory = HibernateUtils.getSessionFactory();
     Session sess = null;       
     try {         
         sess = sessionFactory.getCurrentSession();  
     } catch (org.hibernate.HibernateException he) {  
         sess = sessionFactory.openSession();     
     }             
     return sess;
  } 
}