如果出现类似下面的错误:

Exception in thread "main" org.hibernate.MappingException: You may only specify a cache for root 
     
       mappings    at org.hibernate.cfg.Configuration.getRootClassMapping(Configuration.java:2724)    at org.hibernate.cfg.Configuration.applyCacheConcurrencyStrategy(Configuration.java:2764)    at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1375)    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1826)    at zhongfucheng.aa.App5.main(App5.java:17)    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)    at java.lang.reflect.Method.invoke(Method.java:601)    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)Process finished with exit code 1
     

查看你设置的在配置文件设置的缓存类是否是继承着别的类，也就是说：我开始的时候是配置的是Monkey这个类…而Monkey这个类继承着Animal，因此报错了。。

也就是说：Hibernate在二级缓存中不能配置子类