Hi,
according to the JPA spec, the NoResultException should not cause
transaction rollback, but seems some JPA implementations of the JPA
violate the rule
http://forum.springsource.org/showthread.php?t=43547
I was lazy to test it by myself, but at the forum is a way to force
specific exceptions not to cause rollback. I did not test on GAE
(sorry, no time, I will leave it in your capable hands)
On our project we checked for item count first, but on GAE it would
consumate you additional CPU cycles :(
Perun
On 25 mar, 02:03, lp <lucio.picc...@gmail.com> wrote:
> that previous example code was too complex... phew it was a late night
>
> this a simpler example of the a method that does a rollback when a
> NoResultException is thrown.
>
> even if the exception is handled it doesnt matter the txn is rollback and no
> commits are done.
>
> if the NoResultException is NOT thrown the method commits correctly.
>
> is this voodoo or something?
>
> @Transactional( propagation=Propagation.NOT_SUPPORTED)
> public void txnMethod( Collection<Long> list) throws
> ApplicationExecption{
>
> for (Iterator<Long> iterator = list.iterator(); iterator.hasNext();)
> {
> Long fbId = iterator.next();
> PositionUser user = null;
> final Query query =
> em.createNamedQuery(PositionUser.FIND_BY_FB_ID);
> query.setParameter("facebookId", fbId);
> try {
> user = (PositionUser) query.getSingleResult();
> }
> catch (NoResultException e) {
> log.info( "error occured:" + e.toString() );
> }catch (NonUniqueResultException e) {
> throw new ApplicationExecption(e);
> }
>
> if(user!= null) {
> user.setAccuracy(5000);
> em.merge(user);
> }
> }
>
> }
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