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Date: Wed, 25 Jul 2007 14:11:40 -0400
From: Elias Torres <elias@torrez.us>
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To: dev@openjpa.apache.org
Subject: Re: uuid-string not generating unique ids
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Thank you Patrick and Mark. I'm using 0.9.7, so I'm either patching it
or switching to trunk. Do you think it'd be safe (for an agile
development group) to switch to trunk from 0.9.7 or were there many big
changes since then?

Anyways, thanks again. I'll ask a couple of other things later.

-Elias

Patrick Linskey wrote:
> I just committed a change that will maybe resolve the issue. Please
> let us know if you see it come up again.
> 
> I also logged the issue as OPENJPA-296.
> 
> -Patrick
> 
> On 7/25/07, Marc Prud'hommeaux <mprudhom@apache.org> wrote:
>> Patrick-
>>
>> I bet you are right. Your analysis of the problem looks correct to me.
>>
>>
>> On Jul 25, 2007, at 9:12 AM, Patrick Linskey wrote:
>>
>> > Hi,
>> >
>> > Based on a quick read, it looks like maybe the problem is
>> > UUIDGenerator.java:178. I suspect that we should be changing that to
>> > obtain another newTime inside the if block after incrementing the
>> > sequence. However, I'm not an expert in this algorithm; does anyone
>> > have a better grasp on it than do I?
>> >
>> > -Patrick
>> >
>> > On 7/25/07, Elias Torres <elias@torrez.us> wrote:
>> >>
>> >> Hi,
>> >>
>> >> First off, I want to say thank you for the hard work this
>> >> community has
>> >> put on this JPA implementation. I'm extremely eager in getting to
>> >> know
>> >> it better and hopefully put it to good use in some of the projects
>> >> I'm
>> >> currently working on at IBM. If all goes well, I'll be asking some of
>> >> the harder questions later and possibly discuss new features not
>> >> currently implemented.
>> >>
>> >> Now if you could please help me out with a small issue I'm having
>> >> with
>> >> uuid generation.
>> >>
>> >> @Entity
>> >> public class Foo {
>> >>
>> >>   @Id
>> >>   @GeneratedValue(strategy=GenerationType.AUTO, generator="uuid-
>> >> string")
>> >>   private String id;
>> >>
>> >> }
>> >>
>> >> CREATE TABLE Foo (
>> >>   id VARCHAR(16) NOT NULL
>> >> }
>> >>
>> >> If I do one em.persist() it works just fine. However, if I do a a
>> >> whole
>> >> list of them, I get exceptions (duplicate). If I enable logging I can
>> >> see they are all using the same id during INSERT. I stepped a bit
>> >> through the code and noticed that uuid-string doesn't get generated
>> >> while em.persist(), but much later while committing/flushing. I then
>> >> looked a bit (just a bit) at the UUID generator code and noticed that
>> >> the bytes are not changing much (maybe only the first two), but
>> >> again,
>> >> that was while debugging, so I'm assuming I have a supa-fast machine.
>> >>
>> >> Anybody running into the same problem? Any suggestions?
>> >>
>> >> -Elias
>> >>
>> >
>> >
>> > --
>> > Patrick Linskey
>> > 202 669 5907
>>
>>
> 
>