org.hibernate.LazyInitializationException
在一对多和多对一的时候，默认的lazy为true，多表的时候，懒加载是默认的，所以在页面和servlet交互的时候，要将lazy改为false 勤加载和懒加载 勤加载：调用的时候就会先检索一级缓存，如果一级缓存存在对应的主键对象，就不会发起数据库的查询，将缓存中的数据值返回，如果一级缓存没有，就会检索是否存在二级缓存，如果二级缓存存在就返回，否在就发起SQL语句，到达数据库。 懒加载：又叫延迟加载
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