在 Spring-boot 中使用整数键和字符串值反序列化 JSON

Question

I have to de-serialize and serialize back a simple JSON having integer key and string value in Spring-boot using Feign library. I know, if the key is in String, this is pretty straight forward in Spring-boot with automatic serialization and de-serialization. My JSON looks like :

"avatar": {
            "48x48": "https://wfrjira.int.abc.com/secure/useravatar?ownerId=person&avatarId=1234",
            "24x24": "https://wfrjira.int.abc.com/secure/useravatar?size=small&ownerId=person&avatarId=1234"
        }

My POJO bean with proper getters and setters class is :

class Avatar {
private String _48x48;
private String _24x24;

public Avatar() {
}

public Avatar(String _48x48, String _24x24) {
    this._48x48 = _48x48;
    this._24x24 = _24x24;
}                               Getters and Setter ...

I am getting following error :

There was an unexpected error (type=Internal Server Error, status=500). Error while extracting response for type [class [Lcom.XXXXXX.JiraResourceData;] and content type [application/json;charset=UTF-8]; nested exception is org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Cannot deserialize instance of [Lcom.XXXXXX.JiraResourceData; out of START_OBJECT token; nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of [Lcom.XXXXXX.JiraResourceData; out of START_OBJECT token at [Source: (PushbackInputStream); line: 1, column: 1] feign.codec.DecodeException: Error while extracting response for type [class [Lcom.XXXXXX.JiraResourceData;] and content type [application/json;charset=UTF-8]; nested exception is org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Cannot deserialize instance of [Lcom.XXXXXX.JiraResourceData; out of START_OBJECT token; nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of [Lcom.XXXXXX.JiraResourceData; out of START_OBJECT token at [Source: (PushbackInputStream); line: 1, column: 1]

I understand that I need to declare the variables in Avatar class with the name matching with the keys of JSON but strings can't be declared starting with numeric. Is there any other way to resolve this in Spring-boot? Any help would be appreciated.

Answer 1

First of all, your last JSON line has a comma. Remove that. Furthermore, the JSON should be embedded in another set of brackets.

Also, annotate your class with @JsonRootName("avatar") since your class is uppercase but your JSON is lowercase.

Furthermore, you probably want to rename your fields to the field names in the JSON or annotate these with @JsonProperty("my-json-name")