could not insert: [com.TestProducts]

package com;
import org.hibernate.Transaction;
public class HibernateDAOTest {
public static void main(String []args)
{
TestProductsDAO dao=new TestProductsDAO();
Transaction tran=dao.getSession().beginTransaction();
TestProducts bean=new TestProducts();
TestProductsId dd=new TestProductsId();
dd.setId(123);
dd.setAmount(12345);
dd.setAotoid("lkjids");
dd.setPrice(23);
dd.setUsername("lujianxin");
bean.setId(dd);
dao.save(bean);
tran.commit(); //读取数据
java.util.List<TestProducts> results=dao.findAll();
for(TestProducts o: results)
{
System.out.println("编号："+o.getId().getId());
System.out.println("姓名："+o.getId().getUsername());
}
dao.getSession().close();
}

}

我的这个程序报错如下：怎么解决呀？

log4j:WARN No appenders could be found for logger (org.hibernate.cfg

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