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From "Patrick Linskey" <plins...@gmail.com>
Subject Re: uuid-string not generating unique ids
Date Wed, 25 Jul 2007 18:13:06 GMT
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
> >>
> >>
> >
> >
>


-- 
Patrick Linskey
202 669 5907

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