GRAILS default Hibernate cache configuration

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

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

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

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 application, 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 both What is the difference between?

CacheProvider is a legacy and deprecated way to define the second-level cache implementation to be used, as shown in its javadoc. It is to use the regional factory.

For details, see http://docs.jboss.org/hibernate/core/3.6/javadocs/org/hibernate/cache/package-summary.html.