Null value was assigned to a property of primitive type setter of model.LabAppForm.peoplenumber; nes
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异常如下：
HTTP Status 500 - Null value was assigned to a property of primitive type setter of model.LabAppForm.peoplenumber; nested exception is org.hibernate.PropertyAccessException: Null value was assigned to a property of primitive type setter of model.LabAppForm.peoplenumber
造成原因：在LabAppForm.java这一实体的peoplenumber属性类型写的是 int，即：private Integer peoplenumber;//人数
而在实体LabAppForm对应的hibernate映射文件里其属性设置的是Integer类型：
<property name="peoplenumber" type="java.lang.Integer">
<column name="peoplenumber"></column>
</property>
<column name="peoplenumber"></column>
</property>
之后就出现了上面所示异常
解决办法：
把LabAppForm.java这一实体的number属性类型改为Integer类型，即：private Integer peoplenumber;//人数
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