org.springframework.http.converter.HttpMessageNotWritableException: Could not write JSON
记一次踩坑经历：
Resolved [org.springframework.http.converter.HttpMessageNotWritableException: Could not write JSON: (was java.lang.NullPointerException); nested exception is com.fasterxml.jackson.databind.JsonMappingException: (was java.lang.NullPointerException) (through reference chain: com.renqijie.pojo.vo.IndexBean["images"]->java.util.ArrayList[0]->com.renqijie.pojo.Image["id"])]java
缘由：
JavaBean类Image中有一个属性类型刚开始设置成int类型，生成getter/setter方法后，又将其改为了Integer类型，结果就出现了上述状况web
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