[hibernate-issues] [Hibernate-JIRA] Created: (HHH-5980) CacheKey is storing references to entities instead of identifiers
CacheKey is storing references to entities instead of identifiers
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Key: HHH-5980
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5980
Project: Hibernate Core
Issue Type: Bug
Components: caching (L2), core
Affects Versions: 3.6.1
Environment: Ehcache 2.3.2.
Reporter: Ian Brandt
Attachments: hibernate-cachekey-bug.tgz
I'm hitting an issue seemingly similar to HHH-3383, but with {{CacheKey.key}} instead
of {{QueryKey.key}}.
Forum Reference: [CacheKey holds reference to entire entity instance as
key?|https://forums.hibernate.org/viewtopic.php?f=1&t=1009769&sid...].
In our app this is resulting in what is essentially a significant memory leak, as we have
a rather large and highly connected model with cache regions defined for each entity and
collection. We're managing it by clearing the cache via JMX every couple days when
our old gen space fills up. Of course it's not unbounded, where if we were to
approximate the retained heap dominated across all the regions where this is occurring we
could constrain their max entries so to keep things within available RAM.
I'm attaching a minimal app modeled after the tutorial in the docs that demonstrates
at least two cases:
{noformat}
23:56:48,229 ERROR App:63 - CacheKey.key in region
'org.hibernate.bug.cachekey.EntityA.entityBs'
isn't an Integer or Integer[], it's an: EntityA [id=1, nk1=2, nk2=3]!
23:56:48,229 ERROR App:63 - CacheKey.key in region
'org.hibernate.bug.cachekey.EntityA.entityBs'
isn't an Integer or Integer[], it's an: EntityA [id=2, nk1=4, nk2=5]!
23:56:48,229 ERROR App:63 - CacheKey.key in region
'org.hibernate.bug.cachekey.EntityB'
isn't an Integer or Integer[], it's an: EntityB [id1=4, id2=203, nk2=5,
nk3=2003]!
23:56:48,229 ERROR App:63 - CacheKey.key in region
'org.hibernate.bug.cachekey.EntityB'
isn't an Integer or Integer[], it's an: EntityB [id1=2, id2=103, nk2=3,
nk3=1003]!
23:56:48,229 ERROR App:63 - CacheKey.key in region
'org.hibernate.bug.cachekey.EntityB'
isn't an Integer or Integer[], it's an: EntityB [id1=2, id2=102, nk2=3,
nk3=1002]!
23:56:48,230 ERROR App:63 - CacheKey.key in region
'org.hibernate.bug.cachekey.EntityB'
isn't an Integer or Integer[], it's an: EntityB [id1=2, id2=101, nk2=3,
nk3=1001]!
23:56:48,230 ERROR App:63 - CacheKey.key in region
'org.hibernate.bug.cachekey.EntityB'
isn't an Integer or Integer[], it's an: EntityB [id1=4, id2=200, nk2=5,
nk3=2000]!
23:56:48,230 ERROR App:63 - CacheKey.key in region
'org.hibernate.bug.cachekey.EntityB'
isn't an Integer or Integer[], it's an: EntityB [id1=2, id2=100, nk2=3,
nk3=1000]!
23:56:48,230 ERROR App:63 - CacheKey.key in region
'org.hibernate.bug.cachekey.EntityB'
isn't an Integer or Integer[], it's an: EntityB [id1=4, id2=202, nk2=5,
nk3=2002]!
23:56:48,230 ERROR App:63 - CacheKey.key in region
'org.hibernate.bug.cachekey.EntityB'
isn't an Integer or Integer[], it's an: EntityB [id1=4, id2=201, nk2=5,
nk3=2001]!
{noformat}
My apologies that the attached isn't a unit test, but I can't yet claim to
understand how this manifests nor the internals enough to narrow it down that far. I
looked briefly at {{FunctionalTestCase}} per http://hibernate.org/issuetracker, but after
cloning 3.6 with Git I couldn't find any examples of its usage. Rather than get hung
up I pushed ahead with the attached.
Just FYI in our app we're also seeing {{EntityA}} cached as a key in its own region,
as opposed to just its collection regions as above, but I haven't managed to reproduce
that yet minimally. We seem to have many regions with entities in {{CacheKey.key}}, so
there may be other situations that I haven't had a chance to single out yet.
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