Test case:

• using Hibernate 5.0.6 with ehcache;

<?xml version="1.0" encoding="UTF-8"?>
<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
		 xsi:noNamespaceSchemaLocation="http://www.ehcache.org/ehcache.xsd"
		 updateCheck="false" monitoring="autodetect" dynamicConfig="true">
  <cache name="configurationCache" eternal="false" timeToLiveSeconds="3600" maxEntriesLocalHeap="500"/>
</ehcache>

• annotating the entity classes with @Cache

  @Entity
  @Cache(usage = org.hibernate.annotations.CacheConcurrencyStrategy.READ_WRITE, region = "someConfigurationCache")
  public class SomeConfiguration implements Serializable {
      @OneToMany(cascade = CascadeType.ALL, orphanRemoval = true)
      @JoinColumn(name = "some_configuration_id", referencedColumnName = "id")
      @Cache(usage = org.hibernate.annotations.CacheConcurrencyStrategy.READ_WRITE, region = "otherConfigurationCache")
      private List<OtherConfiguration> confList;
  }
  

• both "someConfigurationCache" and "otherConfigurationCache" are reused for entity and collection as well.
  The result is "org.hibernate.cache.ehcache.internal.nonstop.NonstopAwareEntityRegionAccessStrategy cannot be cast to org.hibernate.cache.spi.access.CollectionRegionAccessStrategy", because the method determineCollectionRegionAccessStrategy in SessionFactoryImpl finds a region with the name required, but it is an entity region, not a collection region.
  The same scenario works with 5.0.3.