这个异常：org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: org.joshua.ss.entity.SysUsers.sysUsersRoleses, no session or session was closed
Exception in thread "main" org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: org.joshua.ss.entity.SysUsers.sysUsersRoleses, no session or session was closed at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:380) at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:372) at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:365) at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:108) at org.hibernate.collection.PersistentSet.iterator(PersistentSet.java:186)
原因：在hibernate的映射关系中由于延迟加载，之前的操作使session已经关闭，所以加载set属性时无可用session
解决办法：在映射文件中设置set属性 lazy='false'
<set name="sysUsersRoleses" inverse="true" cascade="all" lazy="false">
<key>
<column name="USER_ID" length="32" />
</key>
<one-to-many class="org.joshua.ss.entity.SysUsersRoles" />
</set>
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