org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: XXXX

  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

[java] view plain copy

1. 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  
2.     at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:380)  
3.     at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:372)  
4.     at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:365)  
5.     at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:108)  
6.     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'

[java] view plain copy

1. <set name="sysUsersRoleses" inverse="true" cascade="all"<span style="color:#FF0000;"> lazy="false"</span>>  
2.             <key>  
3.                 <column name="USER_ID" length="32" />  
4.             </key>  
5.             <one-to-many class="org.joshua.ss.entity.SysUsersRoles" />  
6.         </set>  

具体参考：http://fendoubattier./blog/1040236