HibernateUtil

import Model.Livro;
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import org.hibernate.cfg.AnnotationConfiguration;
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import org.hibernate.SessionFactory;
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/**
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 * Hibernate Utility class with a convenient method to get Session Factory object.
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 *
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 * @author José Alexandre
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 */
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public class HibernateUtil {
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    private static SessionFactory sessionFactory;
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    private HibernateUtil() {
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    }
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    public static SessionFactory getSessionFactory() {
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        if (sessionFactory == null) {
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            try {
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                // Create the SessionFactory from standard (hibernate.cfg.xml)
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                // config file.
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                AnnotationConfiguration ac = new AnnotationConfiguration();
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                ac.addAnnotatedClass(Livro.class);
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                sessionFactory = ac.configure().buildSessionFactory();
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            } catch (Throwable ex) {
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                // Log the exception.
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                System.err.println("Initial SessionFactory creation failed." + ex);
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                throw new ExceptionInInitializerError(ex);
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            }
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            return sessionFactory;
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        } else {
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            return sessionFactory;
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        }
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    }