[Building Sakai] has anyone seen one of these before? hibernate cache death.

[Jim Eng]

I have found only one hibernate jar among the artifacts deployed for this sakai instance (basically a trunk build from a month or so ago with some additional contrib projects and ctools-specific projects).  That is here:

	shared/lib/hibernate-3.2.7.ga.jar

The other interpretation I thought of for Ian's message is that in some project some code is using a static hibernate method to get a session factory instead of getting it from the component manager.  I may have done that myself at some time.  Is that the meaning?  

Appreciate any advice anybody can give.  

Thanks.

Jim
 

On Dec 10, 2012, at 10:21 AM, Jim Eng wrote:

> 
> Ian:  This is reaching back to ancient times for you, I'm sure, but you gave
> the following advice five years ago.  I'm not sure I understand correctly,
> but it seems like the second paragraph may be saying that a hibernate jar is
> being deployed in some sakai component war instead of having that component
> rely on a common hibernate jar.  If that's the case, would it make sense to
> try to find the culprit by looking for a hibernate jar in a component war
> and then revising the poms for that project to avoid including the hibernate
> jar in the war? Would it make sense to think the cause of this must be a
> contrib or local project rather than part of sakai's kernel or core because
> otherwise it would be a common problem?
> 
> 
> 
> Ian Boston-2 wrote:
>> 
>> This is caused the ehcache singleton being bound to in a war and that 
>> war being reloaded.
>> 
>> Its often caused by having a Hibernate Session factory inside the war 
>> rather than in components or a secondary use of ehcache.
>> 
>> The really nasty thing about this, is that you may not get the error 
>> message until some point after the suspect war has reloaded as it 
>> doesn't happen until one of the consumers of ehcache tries to access a 
>> stale copy of ehcache.
>> 
> 
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