hibernateutil.java

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package hibernate_tier;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.apache.log4j.*;


public class HibernateUtil {

      private static final SessionFactory sessionFactory;
      static Logger log = Logger.getLogger(HibernateUtil.class);

      static {
              try {
                      // Create the SessionFactory
                     // File file = new File("D:\\util\\hibernate.cfg.xml");
                      Configuration config = new Configuration().configure();
                      sessionFactory = config.buildSessionFactory();
              } catch (Throwable ex) {
                      ex.printStackTrace();
                      log.error("Initial SessionFactory creation failed.", ex);
                      throw new ExceptionInInitializerError(ex);
              }
      }

      public static final ThreadLocal session = new ThreadLocal();

      public static Session currentSession() throws HibernateException {
              Session s = (Session) session.get();
              // Open a new Session, if this Thread has none yet
              if (s == null||!s.isOpen()) {
                      s = sessionFactory.openSession();
                      session.set(s);
              }
              return s;
      }

      public static void closeSession() throws HibernateException {
              Session s = (Session) session.get();
              session.set(null);
              if (s != null)
                      s.close();
      }
}