关于 Hibernate缓存的问题

List list = new ArrayList()；

for(int i = 0; i < 50000; i++) {
  Customer c = new Customer();
  list.add(c);
}

// 将存取List存入数据库,这时没有异常
Session session = sessionFactory.openSession();
Transaction tx = session.beginTransaction(); 
session.save(list)
tx.commit()
.....
//  将List读出,由于使用Lazy模式这时不会有异常.
Session session = sessionFactory.openSession();
Transaction tx = session.beginTransaction(); 
List newList = session.createQuery("from List").get(0);
tx.commit()

// 这时读取List中元素。.Hibernate将所有Customer对象恢复，发生//OutofMemeory异常
Customer newCustomer = (Customer)newList.get(0);