Hibernate java.lang.ClassCastException：org.hibernate.action.EntityIdentityInsertAction 无法转换为 org.hibernate.action.EntityInsertAction
我将 Hibernate 与 EntityManager 一起使用。当我使用时
Session session = (Session)entityManager.getDelegate();
session.flush();
session.clear();
，我得到
java.lang.ClassCastException: org.hibernate.action.EntityIdentityInsertAction cannot be cast to org.hibernate.action.EntityInsertAction
at org.hibernate.engine.ActionQueue$InsertActionSorter.sort(ActionQueue.java:636)
at org.hibernate.engine.ActionQueue.sortInsertActions(ActionQueue.java:369)
at org.hibernate.engine.ActionQueue.sortActions(ActionQueue.java:355)
at org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:224)
at org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:99)
at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:50)
at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1216)
由于它没有说明哪个实体导致了问题，所以我被困在这里。有谁知道是什么原因造成的？
I'm using Hibernate with an EntityManager. When I use
Session session = (Session)entityManager.getDelegate();
session.flush();
session.clear();
I get
java.lang.ClassCastException: org.hibernate.action.EntityIdentityInsertAction cannot be cast to org.hibernate.action.EntityInsertAction
at org.hibernate.engine.ActionQueue$InsertActionSorter.sort(ActionQueue.java:636)
at org.hibernate.engine.ActionQueue.sortInsertActions(ActionQueue.java:369)
at org.hibernate.engine.ActionQueue.sortActions(ActionQueue.java:355)
at org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:224)
at org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:99)
at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:50)
at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1216)
Since it doesn't say which entity causes the problem, I'm stuck here. Does anyone have an idea what can cause this?
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这是 Hibernate 中的一个错误。当满足以下条件时抛出异常：
identityhibernate.order_inserts是true发生这种情况是因为 < code>EntityIdentityInsertAction 可以添加到
ActionQueue.insertions列表中，而ActionQueue$InsertActionSorter期望它只包含EntityInsertAction。似乎尚未报告此错误，因此请随时报告。
也许您可以更改 hibernate.order_inserts 的值作为解决方法。
It's a bug in Hibernate. Exception is thrown when following conditions are met:
identityhibernate.order_insertsistrueIt happens because
EntityIdentityInsertActioncan be added to theActionQueue.insertionslist, whereasActionQueue$InsertActionSorterexpects that it contains onlyEntityInsertActions.It looks like this bug was not reported yet, so feel free to report it.
Perhaps you can change the value of
hibernate.order_insertsas a workaround.我收到此错误只是因为我忘记在调用
em.persist(myNewEntity)的方法上添加@Transactional注释，因为我认为所有调用者都将在 Transaction 上，错误不会直接弹出，但是当我尝试从表中删除所有行时，
该错误确实具有误导性，但与 @axtavt 答案
所以
I got this error just because I forget to add
@Transactionalannotation on the method that callsem.persist(myNewEntity)as I thought all the callers will be on Transaction,the error is not popping directly but when I tried to delete all rows from a table
really the error is misleading but its the same as the second case in @axtavt answer
so