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From Elias Torres <el...@torrez.us>
Subject Re: uuid-string not generating unique ids
Date Wed, 25 Jul 2007 18:52:18 GMT
FYI, the patch worked.

-Elias

Patrick Linskey wrote:
> There have been a lot of changes since then, but things should be
> pretty compatible.
> 
> If you've got a good test suite, I'd recommend switching to trunk and
> seeing what happens.
> 
> -Patrick
> 
> On 7/25/07, Elias Torres <elias@torrez.us> wrote:
>>
>> 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
>> >>
>> >>
>> >
>> >
>>
> 
> 

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