hibernate错误

org.hibernate.MappingException: Repeated column in mapping for entity: com.carschool.bean.Traincar column: id (should be mapped with insert="false" update="false")

 

 

<many-to-one name="carclass"   class="com.carschool.bean.Carclass" column="id" 
  　 />

 

 

加上(红色部分)

<many-to-one name="carclass"   class="com.carschool.bean.Carclass" column="id" 
  insert="false" update="false" />