面对 JSON 解析问题，无法从数组值 jackson.databind.exc.MismatchedInputException 反序列化类型为“java.lang.String”的值

Question

Facing a JSON parse issue when trying to include array in my postman request:

{
    "id" : "0",
    "number":["2222", "3333"]
}

pojo:

public class User {
    @Getter @Setter private String      id;
    @Getter @Setter  private String[]   number;

    //i've also tried these:
    @Getter @Setter  private List<String>   number;
    @Getter @Setter  private ArrayList<String>  number;
}

Controller:

@PostMapping("/user")
    public ResponseEntity<Object> getUser(@RequestBody(required=true)User user) {

Trace:

  "trace": "org.springframework.http.converter.HttpMessageNotReadableException: 
JSON parse error: Cannot deserialize value of type `java.lang.String` from Array value (token `JsonToken.START_ARRAY`); 
nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: 
Cannot deserialize value of type `java.lang.String` from Array value (token `JsonToken.START_ARRAY`)
 at [Source: (org.springframework.util.StreamUtils$NonClosingInputStream); line: 3, column: 13] 

Answer 1

不要使用@Getter和@Setter注释，而是将@Data放在你的类上，它将为你的类创建所需的构造函数！

Answer 2

向您的类添加无参数构造函数并使其可Serializable