我有两个持久化实体Obj1和Obj2。 Obj2包含如下的Obj引用。在Obj1中没有对Obj2的引用（在代码级别 - Java）。
I have two persistable entities Obj1 and Obj2. Obj2 contains a reference to Obj like below. There is no reference (at code level - Java) to Obj2 in Obj1.
public class Obj2{ .... @ManyToOne(cascade = {CascadeType.PERSIST, CascadeType.MERGE, CascadeType.REFRESH, CascadeType.REMOVE}, optional = true) private Obj1 obj1;使用@OneToMany更新了Ojbj 1，如下所示：
I updated Ojbj 1 with @OneToMany as suggested:
public class Obj1{ .... @OneToMany(cascade = {CascadeType.PERSIST, CascadeType.MERGE, CascadeType.REFRESH, CascadeType.REMOVE,CascadeType.ALL},orphanRemoval = true) private List<Obj2> obj2;当我尝试删除Obj1时：
When I try to delete Obj1:
em.remove(obj1Instance)Key constaint
It fails due to Foreigh Key constaint
00:35:23,109 WARN [com.arjuna.ats.arjuna] (http--127.0.0.1-8080-1) ARJUNA012125: TwoPhaseCoordinator.beforeCompletion - failed for SynchronizationImple< 0:ffff7f000101:-7f20c644:5369716f:26, org.hibernate.engine.transaction.synchronization.internal.RegisteredSynchronization@dcedf7 >: javax.persistence.PersistenceException: org.hibernate.exception.ConstraintViolationException: Cannot delete or update a parent row: a foreign key constraint fails (`my_db`.`obj2`, CONSTRAINT `FKC4783505BB5D6339` FOREIGN KEY (`obj1_pk`) REFERENCES `obj1` (`pk`)) ... ... 94 more Caused by: org.hibernate.exception.ConstraintViolationException: Cannot delete or update a parent row: a foreign key constraint fails (`my_db`.`obj2`, CONSTRAINT `FKC4783505BB5D6339` FOREIGN KEY (`obj1_pk`) REFERENCES `obj1` (`pk`)) Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot delete or update a parent row: a foreign key constraint fails (`my_db`.`obj2`, CONSTRAINT `FKC4783505BB5D6339` FOREIGN KEY (`obj1_pk`) REFERENCES `obj1` (`pk`))我有（似乎错了！）假定C ascadeType.REMOVE会照顾这个吗？我应该如何处理这个删除？
I had (wrongly it seems!) asumed that CascadeType.REMOVE would take care of this? How should I handle this delete?
/ T
推荐答案谢谢对于帮助家伙......我设法通过结合这两条建议来做到这一点，并且我修改了外键，这样它就可以在DELETE上级联。
Thanks for the help guys... I managed to do it by (sort of ) combining both pieces of advice and I altered the Foreign Key so that it would CASCADE on DELETE.
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