Hibernate:LazyInitializationException: failed to lazily initialize a collection of rol
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Hibernate日常异常：关系映射查询懒加载
在进行一对多的查询中（shop有多个order），遇到了failed to lazily initialize a collection of rol错误。很明显，这里是查询的时候由于懒加载的原因session关闭了，于是接着shop表往下查order的时候失去了session。
这里我们采用配置文件设置懒加载的方式：
一对多：
<set name="orders" cascade="save-update,delete" lazy="false"> <key column="shopId"/><!--Order表中记录的shopId--> <one-to-many class="entity.Order"/> </set>多对一：默认懒加载即可
<many-to-one name="shop" column="shopId" class="entity.Shop" not-null="true"/>hibernate注解设置懒加载： 传送门
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