ehcache2.5后hibernate多SessionFactory报错的解决(Another unnamed CacheManager )

今天在项目中配置多SessionFactory，抛错

Caused by: net.sf.ehcache.CacheException: Another unnamed CacheManager already exists in the same VM. Please provide unique names for each CacheManager in the config or do one of following:

1. Use one of the CacheManager.create() static factory methods to reuse same CacheManager with same name or create one if necessary

2. Shutdown the earlier cacheManager before creating new one with same name.

经查，ehcache在2.5以后，CacheManager使用了Singleton，这样在创建多个CacheManager时就会产生上述错误。
http://ehcache.org/documentation/get-started/concepts 是官方解释

解决方法是在Hibernate的hibernateProperties配置中，加上

<prop key="hibernate.cache.region.factory_class">

org.hibernate.cache.SingletonEhCacheRegionFactory

</prop>