Exception in thread "main" org.hibernate.MappingException: You may only specify a cache for root 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 <class> 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

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 <class> 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