use org.hibernate.cache.ehcache.SingletonEhCacheRegionFactory for hibernate.cache.region.factory_class

- see grails-plugins/grails-hibernate4-plugin@6a069ed for details

Author: lhotari

grails-resources/src/grails/grails-app/conf/DataSource.groovy

@@ -8,8 +8,8 @@ dataSource {
 hibernate {
     cache.use_second_level_cache = true
     cache.use_query_cache = false
-//    cache.region.factory_class = 'net.sf.ehcache.hibernate.EhCacheRegionFactory' // Hibernate 3
-    cache.region.factory_class = 'org.hibernate.cache.ehcache.EhCacheRegionFactory' // Hibernate 4
+//    cache.region.factory_class = 'org.hibernate.cache.SingletonEhCacheRegionFactory' // Hibernate 3
+    cache.region.factory_class = 'org.hibernate.cache.ehcache.SingletonEhCacheRegionFactory' // Hibernate 4
     singleSession = true // configure OSIV singleSession mode
     flush.mode = 'manual' // OSIV session flush mode outside of transactional context
 }