今天在使用Hibernate时，出现了Could not instantiate cache implementation的错误，我是在使用Hibernate tools时报的错误，应该运行时也会出现这样的错误，异常堆栈：
org.hibernate.HibernateException: Could not instantiate cache implementation at org.hibernate.cache.CacheFactory.createCache(CacheFactory.java:64) at org.hibernate.impl.SessionFactoryImpl. (SessionFactoryImpl.java:214) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1294) at org.hibernate.console.ConsoleConfiguration$3.execute(ConsoleConfiguration.java:357) at org.hibernate.console.execution.DefaultExecutionContext.execute(DefaultExecutionContext.java:65) at org.hibernate.console.ConsoleConfiguration.execute(ConsoleConfiguration.java:88) at org.hibernate.console.ConsoleConfiguration.buildSessionFactory(ConsoleConfiguration.java:352) at org.hibernate.eclipse.console.workbench.LazySessionFactoryAdapter.getChildren(LazySessionFactoryAdapter.java:41) at org.hibernate.eclipse.console.workbench.BasicWorkbenchAdapter.getChildren(BasicWorkbenchAdapter.java:97) at org.hibernate.eclipse.console.workbench.BasicWorkbenchAdapter.fetchDeferredChildren(BasicWorkbenchAdapter.java:103) at org.eclipse.ui.progress.DeferredTreeContentManager$1.run(DeferredTreeContentManager.java:196) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55) Caused by: org.hibernate.cache.NoCachingEnabledException: Second-level cache is not enabled for usage [hibernate.cache.use_second_level_cache | hibernate.cache.use_query_cache] at org.hibernate.cache.NoCacheProvider.buildCache(NoCacheProvider.java:21) at org.hibernate.cache.CacheFactory.createCache(CacheFactory.java:61) … 11 more
大概意思是二级缓存不可用，但是项目在开发阶段不需要启动缓存，所以就没有配置。 最后发现问题就是在这里，因为在Hibernate的bean的hbm配置文件中配置了缓存，而在hibernate的配置中没有配置提供的缓存机制，在早起的hibernate的早起版本中默认是提供ehcache的，但是在最近的版本中已经不提供默认配置了。所以必须自己手工配置。在 hibernate的配置中加入如下片段即可
org.hibernate.cache.EhCacheProvider false false
