【JAVA学习】Null value was assigned to a property of primitive type setter of com.##.##.##
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出错环境：SSH项目
出错原因：##.java实体有一个example属性，类型为int；
对应数据库中的字段为EX，类型为 int ；
由于该字段是后来添加的，所以之前的数据该字段的值为(null),当去读取数据是报错：Null value was assigned to a property of primitive type setter of com.##.##.##
解决方法：将example类型改为 Integer ；
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