JackSon将json串转成List<Object>，异常com.fasterxml.jackson.databind.JsonMappingException
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异常具体信息：
com.fasterxml.jackson.databind.JsonMappingException: No suitable constructor found for type [simple type, class com.oliver.bean.User]: can not instantiate from JSON object (need to add/enable type information?)
原因：
User类自定义了带参构造方法
解决：
加入无参构造方法即可
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