请大家分析一下这个HibernateUtil有什么问题？
package com.studorm.dao;
import net.sf.hibernate.HibernateException;
import net.sf.hibernate.Session;
import net.sf.hibernate.Transaction;
import net.sf.hibernate.cfg.Configuration;
public class HibernateUtil {
private static String CONFIG_FILE_LOCATION = "/hibernate.cfg.xml ";
/**//** Holds a single instance of Session */
private static final ThreadLocal threadLocal = new ThreadLocal();
private static final ThreadLocal threadTransaction = new ThreadLocal();
/**//** The single instance of hibernate configuration */
private static final Configuration cfg = new Configuration();
/**//** The single instance of hibernate SessionFactory */
private static net.sf.hibernate.SessionFactory sessionFactory;
/**//**
* Returns the ThreadLocal Session instance. Lazy initialize the
* <code> SessionFactory </code> if needed.
*
* @return Session
* @throws HibernateException
*/
public static Session getSession() throws HibernateException {
Session session = (Session) threadLocal.get();
if (session == null) {
if (sessionFactory == null) {
try {
cfg.configure(CONFIG_FILE_LOCATION);
sessionFactory = cfg.buildSessionFactory();
} catch (Exception e) {
System.err.println( "%%%% Error Creating SessionFactory %%%% ");
e.printStackTrace();
}
}
session = sessionFactory.openSession();
threadLocal.set(session);
}
return session;
}
/**//**
* Close the single hibernate session instance.
*
* @throws HibernateException
*/
public static void closeSession() throws HibernateException {
Session session = (Session) threadLocal.get();
threadLocal.set(null);
if (session != null) {
session.close();
}
}
/**//**
* Default constructor.
*/
private HibernateUtil() {
}
public static void beginTransaction() throws HibernateException {
Transaction tx = (Transaction) threadTransaction.get();
try {
if (tx == null) {
tx = getSession().beginTransaction();
threadTransaction.set(tx);
}
} catch (HibernateException ex) {
throw new HibernateException(ex.toString());
}
}
public static void commitTransaction() throws HibernateException {
Transaction tx = (Transaction) threadTransaction.get();
try {
if (tx != null && !tx.wasCommitted() && !tx.wasRolledBack())
tx.commit();
threadTransaction.set(null);
} catch (HibernateException ex) {
rollbackTransaction();
throw new HibernateException(ex.toString());
}
}
public static void rollbackTransaction() throws HibernateException {
Transaction tx = (Transaction) threadTransaction.get();
try {
threadTransaction.set(null);
if (tx != null && !tx.wasCommitted() && !tx.wasRolledBack()) {
tx.rollback();
}
} catch (HibernateException ex) {
throw new HibernateException(ex.toString());
} finally {
closeSession();
}
}
}
[解决办法]
请大家分析分析一下！
