异常：Null value was assigned to a property of primitive type setter of···
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具体表现：
在执行一个Hibernate实体类对象的删除时页面报此异常。
产生原因：
因为该实体类与另一个类形成双向一对多关系，删除时执行级联，而级联的那个类又有四个子类形成继承映射关系。我在配置第一个实体类时，用了四个Set集合分别存储不同的子类。事实上报的异常中就有第一个子类的特有属性不能为空类字样。
解决办法：
将父类作为Set集合的基本对象。
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