You are looking at documentation for an older release. Not what you want? See the current release documentation.
By default, Hibernate caching is disabled by these parameters:
<property name="hibernate.cache.use_second_level_cache" value="false"/>
<property name="hibernate.cache.use_query_cache" value="false"/>
The Hibernate caching parameters are well described in Hibernate documentation. There is no forced injection of eXo cache provider any more. This can be configured via standard hibernate properties (in xml) like any other hibernate settings.
Also, it is possible to configure size of eXoCache instances via cache service configuration. Every region (eXoCache instance) created by RegionFactory has its own prefix depending on its type. All prefixes are:
ExoCacheRegionFactory-Entity-
ExoCacheRegionFactory-NaturalId-
ExoCacheRegionFactory-Collection-
ExoCacheRegionFactory-QueryResults-
ExoCacheRegionFactory-Timestamps-
So, names of eXoCache instances will look like "ExoCacheRegionFactory-Entity-org.exoplatform.services.organization.impl.GroupImpl". Details about Cache service configuration can be found in eXo Cache section.
Hibernate's second level cache is disabled by default. In case you want to turn it on, you must explicitly set the "hibernate.cache.use_second_level_cache" property to "true".