INFO: HCANN000001: Hibernate Commons Annotations {4.0.1.Final}
二月 12, 2013 10:49:20 下午 org.hibernate.Version logVersion
INFO: HHH000412: Hibernate Core {4.1.4.Final}
二月 12, 2013 10:49:20 下午 org.hibernate.cfg.Environment <clinit>
INFO: HHH000206: hibernate.properties not found
二月 12, 2013 10:49:20 下午 org.hibernate.cfg.Environment buildBytecodeProvider
INFO: HHH000021: Bytecode provider name : javassist
二月 12, 2013 10:49:20 下午 org.hibernate.cfg.Configuration configure
INFO: HHH000043: Configuring from resource: /hibernate.cfg.xml
二月 12, 2013 10:49:20 下午 org.hibernate.cfg.Configuration getConfigurationInputStream
INFO: HHH000040: Configuration resource: /hibernate.cfg.xml
二月 12, 2013 10:49:21 下午 org.hibernate.cfg.Configuration doConfigure
INFO: HHH000041: Configured SessionFactory: null
Exception in thread "main" org.hibernate.AnnotationException: @OneToOne or @ManyToOne on com.model.Student.clas references an unknown entity: com.model.Classes
at org.hibernate.cfg.ToOneFkSecondPass.doSecondPass(ToOneFkSecondPass.java:109)
at org.hibernate.cfg.Configuration.processEndOfQueue(Configuration.java:1519)
at org.hibernate.cfg.Configuration.processFkSecondPassInOrder(Configuration.java:1444)
at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1362)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1731)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1782)
at com.Main.main(Main.java:25)
------解决方案--------------------配置文件错了，少了<mapping class="com.model.Classes"></mapping>
