Corrupt Object message after cache validation

Question

Help!
I am trying to delete a single UserEvent object that is in a one to many collection private owned by a User object.
The way I am doing this is by
1) building a prototype of the UserEvent to delete,
2) setting its primary key attributes (User and date),
3) reading the actual cache object,
4) registering the actual cached object in the unit of work and obtaining a working copy,
5) removing the UserEvent working copy from the its User's UserEvent collection, and
6) setting the User reference in the UserEvent working copy to null
When I commit the unit of work I do not see any delete statements. Instead I called printRegisteredObjects();
validateCache();
validateObjectSpace();
and in my output I see a "cache corrupt" message. I have searched the forums for this and found nothing - can someone kindly give me a clue about how to debug this?
Many thanks
James Carlyle
eventPrototype.setUser(user);
eventPrototype.setEventDate(new Date(Long.parseLong(eventTimes[s])));
UserEvent actual = (UserEvent) getReadSession().readObject(eventPrototype);
UserEvent workingCopy = (UserEvent) this.getUnitOfWork().registerExistingObject(actual);
System.out.println(workingCopy.getUser().getUserEvents().remove(workingCopy));
workingCopy.setUser(null);
workingCopy.setEventSource(null);
workingCopy.setEventType(null);
this.getUnitOfWork().printRegisteredObjects();
this.getUnitOfWork().validateCache();
this.getUnitOfWork().validateObjectSpace();
<opm:attribute-mapping xsi:type="toplink:one-to-many-mapping">
<opm:attribute-name>userEvents</opm:attribute-name>
<opm:reference-class>com.sky.skynet.core.UserEvent</opm:reference-class>
<opm:private-owned>true</opm:private-owned>
<opm:target-foreign-key>
<opm:field-reference>
<opm:source-field table="USEREVENTS" name="USERID" xsi:type="opm:column"/>
<opm:target-field table="USERS" name="USERID" xsi:type="opm:column"/>
</opm:field-reference>
</opm:target-foreign-key>
<toplink:container xsi:type="toplink:list-container-policy">
<toplink:collection-type>oracle.toplink.indirection.IndirectList</toplink:collection-type>
</toplink:container>
<toplink:indirection xsi:type="toplink:transparent-collection-indirection-policy"/>
<toplink:selection-query xsi:type="toplink:read-all-query">
<toplink:container xsi:type="toplink:list-container-policy">
<toplink:collection-type>oracle.toplink.indirection.IndirectList</toplink:collection-type>
</toplink:container>
</toplink:selection-query>
</opm:attribute-mapping>
[TopLink Finest]: 2005.02.10 12:09:49.966--ServerSession(1527262533)--Thread(Thread[HttpRequestHandler-1810844459,5,main])--Execute query ReadObjectQuery(com.sky.skynet.core.User)
[TopLink Finer]: 2005.02.10 12:09:54.640--ServerSession(1527262533)--Thread(Thread[HttpRequestHandler-1810844459,5,main])--client acquired
[TopLink Finest]: 2005.02.10 12:09:54.641--ClientSession(1493049610)--Thread(Thread[HttpRequestHandler-1810844459,5,main])--Execute query ReadObjectQuery(com.sky.skynet.core.UserEvent)
[TopLink Finer]: 2005.02.10 12:09:54.642--ServerSession(1527262533)--Thread(Thread[HttpRequestHandler-1810844459,5,main])--client acquired
[TopLink Finer]: 2005.02.10 12:09:54.663--ClientSession(1736789279)--Thread(Thread[HttpRequestHandler-1810844459,5,main])--acquire unit of work: 1638538680[TopLink Finest]: 2005.02.10 12:09:54.664--UnitOfWork(1638538680)--Thread(Thread[HttpRequestHandler-1810844459,5,main])--Register the existing object com.sky.skynet.core.UserEvent@608a6351
[TopLink Finest]: 2005.02.10 12:09:54.676--UnitOfWork(1638538680)--Thread(Thread[HttpRequestHandler-1810844459,5,main])--Register the existing object com.sky.skynet.core.EventSource@69eb424b
[TopLink Finest]: 2005.02.10 12:09:54.677--UnitOfWork(1638538680)--Thread(Thread[HttpRequestHandler-1810844459,5,main])--Register the existing object com.sky.skynet.core.EventType@544d8040
[TopLink Finest]: 2005.02.10 12:09:54.677--UnitOfWork(1638538680)--Thread(Thread[HttpRequestHandler-1810844459,5,main])--Register the existing object com.sky.skynet.core.User@2c1f14fd
[TopLink Finest]: 2005.02.10 12:09:54.687--UnitOfWork(1638538680)--Thread(Thread[HttpRequestHandler-1810844459,5,main])--Register the existing object com.sky.skynet.core.UserEvent@608a6351
05/02/10 00:09:54 true
[TopLink Severe]: 2005.02.10 12:09:54.696--UnitOfWork(1638538680)--Thread(Thread[HttpRequestHandler-1810844459,5,main])--
UnitOfWork identity hashcode: 1638538680
All Registered Clones:
Key: [1] Identity Hash Code: 1252288055 Object: com.sky.skynet.core.EventType@4aa46637
Key: [1] Identity Hash Code: 1968164628 Object: com.sky.skynet.core.EventSource@754fcf14
Key: [Fri Mar 20 05:00:00 GMT 2020 null] Identity Hash Code: 748356780 Object: com.sky.skynet.core.UserEvent@2c9b04ac
Key: [801] Identity Hash Code: 1865599785 Object: com.sky.skynet.core.User@6f32cb29
[TopLink Finer]: 2005.02.10 12:09:54.696--UnitOfWork(1638538680)--Thread(Thread[HttpRequestHandler-1810844459,5,main])--validate cache.
[TopLink Finest]: 2005.02.10 12:09:54.699--UnitOfWork(1638538680)--Thread(Thread[HttpRequestHandler-1810844459,5,main])--stack of visited objects that refer to the corrupt object: []
[TopLink Finer]: 2005.02.10 12:09:54.700--UnitOfWork(1638538680)--Thread(Thread[HttpRequestHandler-1810844459,5,main])--corrupt object referenced through mapping: null
[TopLink Finer]: 2005.02.10 12:09:54.700--UnitOfWork(1638538680)--Thread(Thread[HttpRequestHandler-1810844459,5,main])--corrupt object: com.sky.skynet.core.UserEvent@2c9b04ac
[TopLink Finer]: 2005.02.10 12:09:54.700--UnitOfWork(1638538680)--Thread(Thread[HttpRequestHandler-1810844459,5,main])--validate object space.
[TopLink Finer]: 2005.02.10 12:09:54.709--UnitOfWork(1638538680)--Thread(Thread[HttpRequestHandler-1810844459,5,main])--begin unit of work commit
[TopLink Finer]: 2005.02.10 12:09:54.714--ClientSession(1736789279)--Thread(Thread[HttpRequestHandler-1810844459,5,main])--Connection(412999145)--begin transaction
[TopLink Finest]: 2005.02.10 12:09:54.715--UnitOfWork(1638538680)--Thread(Thread[HttpRequestHandler-1810844459,5,main])--Execute query UpdateObjectQuery(com.sky.skynet.core.User@6f32cb29)
[TopLink Finest]: 2005.02.10 12:09:54.715--UnitOfWork(1638538680)--Thread(Thread[HttpRequestHandler-1810844459,5,main])--Execute query DeleteObjectQuery(com.sky.skynet.core.UserEvent@2c9b04ac)
[TopLink Fine]: 2005.02.10 12:09:54.716--UnitOfWork(1638538680)--Thread(Thread[HttpRequestHandler-1810844459,5,main])--Connection(412999145)--DELETE FROM USEREVENTS WHERE ((EVENTDATE = ?) AND (USERID = ?))
bind => [2020-03-20 05:00:00.0, null]
[TopLink Finer]: 2005.02.10 12:09:54.739--ClientSession(1736789279)--Thread(Thread[HttpRequestHandler-1810844459,5,main])--Connection(412999145)--commit transaction
[TopLink Finer]: 2005.02.10 12:09:54.763--UnitOfWork(1638538680)--Thread(Thread[HttpRequestHandler-1810844459,5,main])--end unit of work commit
Using
Oracle Application Server Containers for J2EE 10g (10.1.2.0.0)
Oracle TopLink - 10g Developer Preview 3 (10.1.3.0 ) (Build 041116)

Answer 1

Found the answer. I was using an instance of a subclass of User in order to get the cached copy of the UserEvent and thence the working copy. If instead I instantiate a new User and set its primary key userId, and then use that instead to start the process, it works. I still don't understand how, though, since after the cached copy of UserEvent is obtained I wouldn't have thought it mattered how it was obtained.
James