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From Romain Manni-Bucau <rmannibu...@gmail.com>
Subject Re: OpenJPA and DTO problem
Date Fri, 16 May 2014 17:17:17 GMT
if new no need of version which is good and if not new (fact =
em.find(Fact.class, dto.getId());) you can check it


Romain Manni-Bucau
Twitter: @rmannibucau
Blog: http://rmannibucau.wordpress.com/
LinkedIn: http://fr.linkedin.com/in/rmannibucau
Github: https://github.com/rmannibucau


2014-05-16 17:34 GMT+02:00 Karl Kildén <karl.kilden@gmail.com>:
> Hi Romain,
>
> Well in the else block the DTO and the Entity will both be new so the
> version will never be set.
>
> Andy.
>
> Thanks, I am aware of this basic rule but I got confused by reading several
> times that if you use DTO remember to care for the version field. However I
> guess this means I am supposed to throw ApplicationException rollback=true
> myself when I discover that the DTO is old... This actually makes sense
> because the logic required for optimistic lock management is custom and
> it's also more efficient for me to throw while I convert back to entity.
>
> By the way when I am testing optimistic locking
> @Test(expected=MyApplicationException) works poorly, seems that at least
> for tests it gets wrapped with EJBException. I am pretty sure I managed to
> make it ApplicationException correctly because otherwise the exception /
> logging hints that ApplicationException could be used instead to avoid the
> wrapping.
>
> cheers
>
>
> On 14 May 2014 20:19, agumbrecht <agumbrecht@tomitribe.com> wrote:
>
>> You should let the JPA provider manage the @Version field, don't try and
>> change it or read it yourself or you'll always get this error. It's
>> controlled internally by the provider and is to do with optimistic locking.
>>
>> If you want to manage your own entity version the, i.e. versioned data row,
>> then use a different name/field and treat it like any other field - Don't
>> flag it with @Version.
>>
>> Hope this helps.
>>
>> Andy.
>>
>>
>>
>> -----
>>     --
>>     Andy Gumbrecht
>>
>>     http://www.tomitribe.com
>>     agumbrecht@tomitribe.com
>>     https://twitter.com/AndyGeeDe
>>
>>     TomEE treibt Tomitribe ! | http://tomee.apache.org
>> --
>> View this message in context:
>> http://openejb.979440.n4.nabble.com/OpenJPA-and-DTO-problem-tp4669332p4669334.html
>> Sent from the OpenEJB User mailing list archive at Nabble.com.
>>

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