HHH-13046 AggregatedClassLoader in JCacheRegionFactory

[milgner]

Fixes https://hibernate.atlassian.net/browse/HHH-13046 by querying the classloader from the ClassLoaderService.

There is one drawback here: in scenarios where services are actually stopped (OSGi?), the class loader instance will have leaked to the cache factory.

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[milgner]

As it turns out, my changes aren't enough to fix the issue. The test suite itself is running into ClassLoader-related issues, resulting in a defunct singleton and ultimately multiple cache managers. I already commented on the issue. I will try to find some time this weekend for further investigation and a different approach.

The problem being addressed is the fact that when the JSR/JCache cache manager doesn't have access to the same class loader as Hibernate, it can end up being unable to access a class when working with an Entity whose class wasn't loaded by the default application class loader.

[milgner]

Gonna close it for now and re-open once I have a better solution.