dear all,

I am Using Hibernate 3.3 with EHCache 2.6 as provider for the second level cache. As far as i know, hibernate
does not support caching of subclasses. Is there any workaround available.
Is this maybe solved with latest Hibernate 4.x Version? Could i need another Cache-Backend to get it working?

Thanx very much for your help :-)

yours,
Shannon

That's simply not true.
Where did you hear that?

Ive read in several posts that people do have problems configuring Hibernate+2nd Level cache when
trying to cache subclasses (B extends A). I saw the similar effect that subclasses (class B) is not put into cache
or does have some cache hits. I verified this by hibernate statistics.

I found a post showing how this could be arranged:
http://moresbycoffee.blogspot.de/2012/04/coffee-moth-hibernate-l2-cache-and.html

but i am wondering that the caching of subclasses is not working out-of-the-box.
Is there something i have not taken into account to enable subclass-caching?
Thanks again for any help

yours,
Shannon

Well the poster you report was using Hibernate 3.3.2 GA which is a rather old hibernate version.
I use Hibernate4 (and Hibernate3.6 formerly) with EHCache 2.5.1 as 2L-implementatipm
and expect HHH-4953 I did not encounter any problem with subclass caching.
To precise is, that I use Single-Table per hierarchy inheritance strategy only.

Hi,

A while ago, I was facing the same issue of not being able to have a per subclass cache configuration and I saw same cache statstics as Shannon. We are using Hibernate4. I am not sure, but it could be influanced by the inheretance strategy used. We have patched hibernate to have addiitonal property "hibernate.cache.force_per_subclass_second_level_cache=true" and it seems to work fine so far. I am not sure if it will have other side effects in other areas. It would be great if I can get a feedback about this. The older post is https://forum.hibernate.org/viewtopic.php?p=2466300

Regards,
hshicx

Hi,

Ok, saying 'hibernate does not support caching of subclasses' is a somewhat different statement than saying
'hibernate does not support have a per subclass cache configuration'.
While first statement is definitely false the latter might be true quite.
I must admit that I never needed and therefore tested a 'per subclass cache configuration'...