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From Quresh Abazur <>
Subject Trouble inserting parent/child relations.
Date Tue, 11 Nov 2008 22:44:29 GMT

    I am getting really odd behavior on this issue. I have two objects:
     1> Project
     2> Employee.
    Project has a OneToMany with Employee, and the Employee maps back to Project with ManyToOne.
When I try to add a new Project, with new Employee objects, it sometimes works and sometimes
doesn't. The beauty of it, I did a regression test - with a 10 hits, sometimes it would fail
3 out of 10 times, other times it would be failing 8 out of 10. In my code, I do entityManager.persist(project),
and then I simply add my employee items to the collection object on the Project. The failure
message as reported from Oracle:

Caused by ORA-02291: integrity constraint (PAT.FK_PROJECT_EMPL) violated - parent key not

Further more, I took the code and deployed it in Weblogic, and exposed it as a WS. Two more
oddities, in WebLogic (I know, I know, it uses KODO), if I call it with two employee objects
per Project, it succeeds - 100% of the times (I called the service over 100 times not a single
failure) - the moment I start specifying one child per parent, it starts failing any number
of times. (No constant failure rate).
I did the same thing with a TestNG test suite using OpenJPA (1.2.0) and ran it just 10 times
with multiple child records (2) per each parent. I couldn't even get a 100% success rate on
that. Fails 3-4 times (atleast) out of the 10 runs I do.

What gets me is - the code hasn't changed between the multiple executions - whats happening

I am not doing an explicit persist on the child records - even though I tried that to no avail.
I tried calling the persist on the Parent BEFORE adding the child records to the Parent's
collection - to no success.
I then started doing the persist on the Parent AFTER adding the child records to the Parent
- I knew this to be incorrect, and well - it too failed.

If anyone else has faced such issues - or knows anything about this - I would appreciate it.


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