錯誤信息：

2019-02-19 09:17:58,678 [http-nio-8080-exec-1] WARN org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver - Failed to read HTTP message: org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: No suitable constructor found for type [simple type, class com.findsoft.policy.api.param.web.caseexperiment.CreateOrUpdateCaseDepartmentStepRequest]: can not instantiate from JSON object (missing default constructor or creator, or perhaps need to add/enable type information?); nested exception is com.fasterxml.jackson.databind.JsonMappingException: No suitable constructor found for type [simple type, class com.findsoft.policy.api.param.web.caseexperiment.CreateOrUpdateCaseDepartmentStepRequest]: can not instantiate from JSON object (missing default constructor or creator, or perhaps need to add/enable type information?) at [Source: java.io.PushbackInputStream@53fb391e; line: 2, column: 3]

報錯原因：由於實體類寫有參構造函數，但是未補充無參構造函數，引發報錯。

Java構造函數詳解 可訪問：https://blog.csdn.net/qq_33642117/article/details/51909346

JSON parse error: No suitable constructor found for type