Re: [Hibernate] serialized/deserialized criteria and query cache issue

[Max R. A. <max...@jb...>]

could probably just be solved with a proper equals/hashcode impl; but
custom serialization would also work but not if it influences possible  
subclasses.

> Hi!
>
> I already posted on the user list, but I looks like due to the massive
> posts it got lost.
> I took many time to think about this issue, and so I'll post it to your
> dev list as I'll eventually try to create a patch for it.
>
> Hibernate version:
> 3.2.0 rc1
>
> A serialized/deserialized DetachedCriteria do not work correctly with
> the query cache.
> The problem is the ResultTransformer in QueryKey.
>
> In CriteraImpl the resultTransformer will be set to Criteria.ROOT_ENTITY.
> This makes it down into the QueryKey.
>
> After serialize/deserialize the instance of resultTransformer in
> CriteriaImpl has changed (not that a surprise ;-) ) and thus - in the
> end - the QueryKey changed.
>
> Subsequent lookup in the query-cache will no longer work.
> The query will be executed again and put int the query-cache.
> The cache grows - every lookup failes.
>
> I think every ResultTransformer used as singleton should implement some
> custom deserialization code so that always the same instance will be
> returned - this is one solution.
>
> What solution do you prefer? Just in case I manage to send a patch.
>
> Thanks!
> Ciao,
> Mario
>
>
>
> -------------------------------------------------------
> Using Tomcat but need to do more? Need to support web services, security?
> Get stuff done quickly with pre-integrated technology to make your job  
> easier
> Download IBM WebSphere Application Server v.1.0.1 based on Apache  
> Geronimo
> http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
> _______________________________________________
> hibernate-devel mailing list
> hib...@li...
> https://lists.sourceforge.net/lists/listinfo/hibernate-devel



-- 
--
Max Rydahl Andersen
callto://max.rydahl.andersen

Hibernate
ma...@hi...
http://hibernate.org

JBoss Inc
max...@jb...