测试SessionFactory失败！

package springWebwork2;

import net.sf.hibernate.*;
import net.sf.hibernate.cfg.*;
import org.apache.commons.logging.*;
import java.util.*;

import manager.*;

public class HibernateUtil {

private static Log log = LogFactory.getLog(HibernateUtil.class);

private static final SessionFactory sessionFactory;

static {
  try {
   // Create the SessionFactory
   sessionFactory = new Configuration().configure().buildSessionFactory();
  } catch (Throwable ex) {
   log.error("创建SessionFactory失败：", ex);
   throw new ExceptionInInitializerError(ex);
  }
}

//使用ThreadLocal实现线程安全
public static final ThreadLocal LocalSession = new ThreadLocal();

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

public static void closeSession() throws HibernateException {
  Session s = (Session) LocalSession.get();
  LocalSession.set(null);
  if (s != null)
   s.close();
}
//测试代码
public static void main(String[] args) throws Exception {
  Session session = HibernateUtil.currentSession();
  Transaction tx = session.beginTransaction();
  //创建数据对象并插入表
  Manager B = new Manager();
  //B.setBlockname("新区");
  //B.setShoworder(0);
  //相当于insert
  //session.save(B);

  //用list方法查询数据
  Query q = session.createQuery("from manager"); //用对象类名，而非表名
  List l = q.list();//返回一个List接口，用来遍历结果集

  for (int i = 0; i < l.size(); i++) {
   B = (Manager) l.get(i);
   System.out.println(B.toString());
  }
  //更新数据
  //Query qq = session.createQuery("from SimpleUser");
  //B = (Block) session.load(Block.class, new Integer(1));
  //B.setBlockname("其它");
  //tx.commit();
  //关闭
  HibernateUtil.closeSession();
}
}

执行到
sessionFactory = new Configuration().configure().buildSessionFactory();
时出现异常！我用的是eclipse M1.7 + hibernate2 + postgreSql
我刚刚学习Hibernate ，请给点帮助谢谢！