GORM多对多映射引发的问题

xiao0556 2008-06-17
以前多对多映射都没有用过List方式,现在需要一个有序的列表结果报错 下面是代码:
class Student {
	//科目
	static hasMany = [subjects:Subject]
    List subjects
}

class Subject {
	 static mapping = {
		    table 'cto_subject'

		  }
	static belongsTo = Student
	static hasMany = [students:Student]
	String name
}

直接保持Subject里出错
errors.GrailsExceptionResolver org.springframework.dao.InvalidDataAccessResourceUsageException: could not insert: [Subject]; nested exception is org.hibernate.exception.DataException: could not insert: [Subject]
这是什么原因造成的?
right 2008-06-17
从以上信息,原因我判断不出来,娃哈哈
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