Question

The Grails 2.0.0 reference manual shows the following as the default Hibernate cache config

hibernate {
    cache.use_second_level_cache=true
    cache.use_query_cache=true
    cache.provider_class='org.hibernate.cache.EhCacheProvider'
}

But if you create a Grails 2.0.0 app, what you actually get is

hibernate {
    cache.use_second_level_cache = true
    cache.use_query_cache = true
    cache.region.factory_class = 'net.sf.ehcache.hibernate.EhCacheRegionFactory'
}

Can someone explain what the difference between these two is?

Answer 1

CacheProvider is a legacy, deprecated way of defining which second-level cache implementation to use, as indicated in its javadoc. The new way is to use a region factory.

See http://docs.jboss.org/hibernate/core/3.6/javadocs/org/hibernate/cache/package-summary.html for details.