org.hibernate.LazyInitializationException【延迟加载异常】
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org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: cn.tripod.bos.domain.base.Courier.fixedAreas, could not initialize proxy - no Session
原因：由于表之间存在ManyToMany ManyToOne OneToMany时，由于lazy属性默认设置为true，当我们需要用到某一实例时，session已经关闭，导致该异常的发生！
解决方法：
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