ehcache hibernate4整合问题

当在原有hibernate使用ehcache缓存的项目中加入ehcache时，报如下错误时

Caused by: org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.engine.spi.CacheImplementor]
	at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:186)
	at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:150)
	at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:131)
	at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:262)
	at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1750)
	at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1788)
	at org.springframework.orm.hibernate4.LocalSessionFactoryBuilder.buildSessionFactory(LocalSessionFactoryBuilder.java:363)
	at org.springframework.orm.hibernate4.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:453)
	at org.springframework.orm.hibernate4.LocalSessionFactoryBean.afterPropertiesSet(LocalSessionFactoryBean.java:438)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1627)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1564)
	... 57 more
Caused by: org.hibernate.cache.CacheException: 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.
The source of the existing CacheManager is: InputStreamConfigurationSource [stream=java.io.BufferedInputStream@163d9f8d]
	at org.hibernate.cache.ehcache.EhCacheRegionFactory.start(EhCacheRegionFactory.java:110)
	at org.hibernate.internal.CacheImpl.<init>(CacheImpl.java:70)
	at org.hibernate.engine.spi.CacheInitiator.initiateService(CacheInitiator.java:40)
	at org.hibernate.engine.spi.CacheInitiator.initiateService(CacheInitiator.java:35)
	at org.hibernate.service.internal.SessionFactoryServiceRegistryImpl.initiateService(SessionFactoryServiceRegistryImpl.java:91)
	at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:176)
	... 67 more
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.
The source of the existing CacheManager is: InputStreamConfigurationSource [stream=java.io.BufferedInputStream@163d9f8d]
	at net.sf.ehcache.CacheManager.assertNoCacheManagerExistsWithSameName(CacheManager.java:529)
	at net.sf.ehcache.CacheManager.init(CacheManager.java:374)
	at net.sf.ehcache.CacheManager.<init>(CacheManager.java:259)
	at org.hibernate.cache.ehcache.EhCacheRegionFactory.start(EhCacheRegionFactory.java:83)
	... 72 more

　　可以将配置文件中

<prop key="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.EhCacheRegionFactory</prop>

　　这部分配置修改为：

<prop key="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.SingletonEhCacheRegionFactory</prop>