Postman傳遞Josn字段報錯：Cannot deserialize instance of `java.util.ArrayList ` out of VALUE_STRING token

Postman傳遞Josn字段報錯：Cannot deserialize instance of java.util.ArrayList<java.lang.Object> out of VALUE_STRING token

• 問題：
  

  2021-08-02 10:15:07.816 ERROR 9796 --- [nio-8082-exec-6] c.y.c.b.e.GlobalExceptionHandler : /training/add : JSON parse error: Cannot deserialize instance of java.util.ArrayList<java.lang.Object> out of VALUE_STRING token; nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of java.util.ArrayList<java.lang.Object> out of VALUE_STRING token
  at [Source: (PushbackInputStream); line: 9, column: 20] (through reference chain: com.yun.cloud.gap.entity.request.record.EmployeeTrainingRequest["trainingUrls"])

• 原因：此時在數據映射過程中，數據類型不兼容以致於在相互轉化時出錯。因此我們只需要修改為數組格式“[“值1”,“值2”,…]”就行，如下圖所示：