Caused by: org.hibernate.MappingException: Repeated column in mapping for entity
Caused by: org.hibernate.MappingException: Repeated column in mapping for entity: com.ambow.lmsx.enrollment.entity.EnrStudentInfo column: fclass_code (should be mapped with insert="false" update="false")
一个或多个字段已经映射过，比如定义了字段对应的变量，对变量做了get，set方法，但是该字段又在一对多，多对一的时候映射了其他的实体，就会出这样的问题。
