映射异常: An association from the table TBL_TRAIN_COURSE_MONTH_PLAN refers to an unmapped class

关联时，要注意：

class最好写全包路径，不然会出现以上错误的

Caused by: org.hibernate.MappingException: An association from the table TBL_TRAIN_COURSE_MONTH_PLAN refers to an unmapped class: com.sencloud.dh.oa.action.basedata.TrainCourse
    at org.hibernate.cfg.Configuration.secondPassCompileForeignKeys(Configuration.java:1067)
    at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:989)
    at org.hibernate.cfg.Configuration.buildMappings(Configuration.java:932)
    at org.springframework.orm.hibernate3.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:673)
    at org.springframework.orm.hibernate3.AbstractSessionFactoryBean.afterPropertiesSet(AbstractSessionFactoryBean.java:211)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1369)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1335)
    ... 41 more
2012-11-27 16:46:44 org.