hibernate

[chengshitao123]

这是报的错：
log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
Exception in thread "main" org.hibernate.TransactionException: Transaction not successfully started
at org.hibernate.transaction.JDBCTransaction.rollback(JDBCTransaction.java:149)
at com.mr.hibernate.AddProduct.main(AddProduct.java:28)

这是我product.hbm.xml代码：
package com.mr.hibernate;

import org.hibernate.Session;

import com.mr.hibernate.HibernateInitialize;
//import com.mr.hibernate.Product;

public class AddProduct {


public static void main(String[] args) {
Session session = null;
Product product = new Product();

product.setName("Java Web");
product.setPrice(79.00);
product.setFactory("fff");
product.setRemark("fffg");

try {
session = HibernateInitialize.getSession();
session.beginTransaction();
session.save(product);
session.getTransaction().commit();
} catch (Exception e) {
session.getTransaction().rollback();
System.out.println("数据添加失败");
e.printStackTrace();
}finally{
HibernateInitialize.closeSession();
}
}
}