JPA项目中的错误

Null value was assigned to a property of primitive type setter of edu.nju.student.model.StudentExam.score org.hibernate.PropertyAccessException: Null value was assigned to a property of primitive type setter of MyDomain.myAttributeat grails.orm.HibernateCriteriaBuilder.invokeMethod(HibernateCriteriaBuilder.java:1077)

jpa项目中遇到这个错误，谷歌之后说错误在于StudentExam这个model的score类用的是基础数据类型int，应该用对应的Integer
参考：http://stackoverflow.com/questions/3154582/why-do-i-get-a-null-value-was-assigned-to-a-property-of-primitive-type-setter-o
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