orphan removal constraint violation - jpa-2.0

Question

I am using EclipseLink and have the following entity classes (I tried to simplify the scenario as much as I could, but after any further simplification, the error does not occur):
#Entity
public class A {
#Id
#GeneratedValue
private long id;
#OneToOne(cascade = CascadeType.ALL, orphanRemoval=true)
private AbstractB b;
}
#Entity
#Inheritance(strategy = InheritanceType.JOINED)
public abstract class AbstractB {
#Id
#GeneratedValue
protected long id;
}
#Entity
public class BImpl extends AbstractB {
#OneToOne(cascade = CascadeType.ALL, orphanRemoval=true)
private D d;
}
#Entity
public class D {
#Id
#GeneratedValue
private long id;
#OneToMany(cascade = CascadeType.ALL, orphanRemoval = true)
#Size(min = 1)
private Set<C> cs = new HashSet<C>();
}
#Entity
public class C {
#Id
#GeneratedValue
private long id;
}
with an instance of A referencing a BImpl, which references a D, which in turn holds an instance of C in a set.
As you can see in the code, all references have orphanremoval set to true and CascadeType.ALL.
When I set the reference of A->AbstractB to null and merge back the instance of A, the following constraint violation occurs:
20:05:03,388 INFO [STDOUT] [EL Fine]: 2012-04-13 20:05:03.388--ClientSession(2132156535)--Connection(1281180651)--Thread(Thread[http-0.0.0.0-443-2,5,jboss])--UPDATE A SET B_ID = ? WHERE (ID = ?)
20:05:03,388 INFO [STDOUT] bind => [null, 1]
20:05:03,390 INFO [STDOUT] [EL Fine]: 2012-04-13 20:05:03.39--ClientSession(2132156535)--Connection(1281180651)--Thread(Thread[http-0.0.0.0-443-2,5,jboss])--DELETE FROM BIMPL WHERE (ID = ?)
20:05:03,390 INFO [STDOUT] bind => [2]
20:05:03,391 INFO [STDOUT] [EL Fine]: 2012-04-13 20:05:03.391--ClientSession(2132156535)--Connection(1281180651)--Thread(Thread[http-0.0.0.0-443-2,5,jboss])--DELETE FROM ABSTRACTB WHERE (ID = ?)
20:05:03,391 INFO [STDOUT] bind => [2]
20:05:03,392 INFO [STDOUT] [EL Fine]: 2012-04-13 20:05:03.392--ClientSession(2132156535)--Connection(1281180651)--Thread(Thread[http-0.0.0.0-443-2,5,jboss])--DELETE FROM C WHERE (ID = ?)
20:05:03,393 INFO [STDOUT] bind => [4]
20:05:03,393 INFO [STDOUT] [EL Fine]: 2012-04-13 20:05:03.393--ClientSession(2132156535)--Thread(Thread[http-0.0.0.0-443-2,5,jboss])--SELECT 1
20:05:03,394 INFO [STDOUT] [EL Warning]: 2012-04-13 20:05:03.394--UnitOfWork(2142376869)--Thread(Thread[http-0.0.0.0-443-2,5,jboss])--Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.3.0.v20110604-r9504): org.eclipse.persistence.exceptions.DatabaseException
20:05:03,394 INFO [STDOUT] Internal Exception: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot delete or update a parent row: a foreign key constraint fails (`db`.`D_C`, CONSTRAINT `FK_D_C_cs_ID` FOREIGN KEY (`cs_ID`) REFERENCES `C` (`ID`))
20:05:03,394 INFO [STDOUT] Error Code: 1451
20:05:03,395 INFO [STDOUT] Call: DELETE FROM C WHERE (ID = ?)
20:05:03,395 INFO [STDOUT] bind => [4]
Could anyone explain to me, why the D_C entry does not get deleted before the C instance?

Answer 1

adding #CascadeOnDelete may solve your problem
#OneToMany(cascade = CascadeType.ALL, orphanRemoval = true)
#CascadeOnDelete
#Size(min = 1)
public Set<TestChild> childrenSet = new HashSet<TestChild>();
see also: EclipseLink DeleteCascade
HTH Danny