Hibernate java.lang.ClassCastException: org.hibernate.action.EntityIdentityInsertAction cannot be cast to org.hibernate.action.EntityInsertAction

It's a bug in Hibernate. Exception is thrown when following conditions are met:

• id generation strategy is identity
• entity is saved outside of transaction
• hibernate.order_inserts is true

It happens because EntityIdentityInsertAction can be added to the ActionQueue.insertions list, whereas ActionQueue$InsertActionSorter expects that it contains only EntityInsertActions.

It looks like this bug was not reported yet, so feel free to report it.

Perhaps you can change the value of hibernate.order_inserts as a workaround.