[hibernate-dev] classloading issue when trying to add envers to as7

[Adam Warski]

As a follow-up, I tried adding Envers to a web application deployed on AS7 today, using Hibernate provided with the AS.
I got some class loading problems though with dom4j. See the forum discussion:

http://community.jboss.org/message/618823#618823

I also tried creating a separate Envers module which would depend on org.hibernate, but the Hibernate doesn't seem to see the Envers Integrator.

Strong Liu: isn't it something you've prepared a patch for? I don't think it was included?

Adam

On Jun 21, 2011, at 8:23 AM, Adam Warski wrote:

> 
> On Jun 20, 2011, at 7:56 PM, Scott Marlow wrote:
> 
>>> 
>>> and adding envers into org.hibernate module, means there will no org.hibernate.envers module, and a (jpa) app's classloader can access org.hibernate module, right? so it can access envers class too.
>> 
>> Wrong, just adding envers to org.hibernate (either via a module dependency or the jar directly) doesn't result in envers being exported from the org.hibernate module.  There is an option to do that, if so desired (via the export="true").  The better option is knowing whether or not it is needed and dynamically injecting envers only if it is.
> 
> Not sure how it works exactly, but I suppose that if the application declares somehow that it uses Envers, only then the Envers module should be visible? Looking at the dependencies tree between Hibernate modules, Envers is a leaf, so in theory it should be doable ;).
> 
>> From what you previously said, I think the dependencies are:
>> 
>> - Application classes may reference the envers annotation.
>> 
>> - Application classes may reference Hibernate classes.
>> 
>> - Hibernate core may reference envers.
>> 
>> - Hibernate envers may reference Hibernate core.
>> 
>> Sound right so far?
> 
> Well Core doesn't reference Envers in any way.
> 
> Envers aside, I think the Integrators should work anyway. Say a user creates his own Integrator and puts it as part of the application classes - will Hibernate see it on startup? The same applies to Envers - Hibernate should see the integrator if the module is enabled.
> 
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> Adam Warski
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Adam Warski

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