hibernate exception (cannot simultaneously fetch multiple bags)

org.hibernate.loader.MultipleBagFetchException: 
cannot simultaneously fetch multiple bags at org.hibernate.loader.BasicLoader.postInstantiate(BasicLoader.java:94) 
at org.hibernate.loader.entity.EntityLoader.<init>(EntityLoader.java:119) 
at org.hibernate.loader.entity.EntityLoader.<init>(EntityLoader.java:71) 
at org.hibernate.loader.entity.EntityLoader.<init>(EntityLoader.java:54) 
at org.hibernate.loader.entity.BatchingEntityLoader.createBatchingEntityLoader(BatchingEntityLoader.java:133) 
at org.hibernate.persister.entity.AbstractEntityPersister.createEntityLoader(AbstractEntityPersister.java:1914) 
at org.hibernate.persister.entity.AbstractEntityPersister.createEntityLoader(AbstractEntityPersister.java:1937) 
at org.hibernate.persister.entity.AbstractEntityPersister.createLoaders(AbstractEntityPersister.java:3205) 
at org.hibernate.persister.entity.AbstractEntityPersister.postInstantiate(AbstractEntityPersister.java:3191) 
at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:348) 
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1872) 
at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:906) 
at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:57) 
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:63)

解决：

改变FetchMode为@Fetch(FetchMode.SUBSELECT)，即发送另外一条select语句抓取前面查询到的所有实体对象的关联实体

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