加了ehcache.jar怎么还报org.hibernate.cache.internal.NoCacheProvider??

报错:
Cache provider: org.hibernate.cache.internal.NoCacheProvider
Exception in thread "main" org.hibernate.HibernateException: could not instantiate CacheProvider: org.hibernate.cache.internal.NoCacheProvider
at org.hibernate.cfg.SettingsFactory.createCacheProvider(SettingsFactory.java:330)
at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:219)
at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:1881)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1174)
at StudentTest.main(StudentTest.java:17)

怎么回事 就是一个最基本的例子。加包问题郁闷。

[code="java"]

false
<!-- update -->

3
50
50
<!--property name="hibernate.cache.provider_class">org.hibernate.cache.EhCacheProvider

[/code]

这里配置了么?