How to parse a json with dynamic property name in java?

Question

I need to consume and parse incoming json from a CRM system in my code. I used RestTemplate to do it. So the response from the CRM system looks like below.

{ "GvyArEFkg6JX6wI": {
     "entityId": "GvyArEFkg6JX6wI",
     "mergePolicy": {
         "id": "9245a39d-fe1a-4b33-acab-9bc5cbabf37c"
     }
    }
}

Now the problem is the property name ("GvyArEFkg6JX6wI" in this case) in dynamic and in the next response it would be another string. In this case, how can I parse this json as this is not fixed? I tried using jsonGetter but it only wraps it around another block and still does not resolve the problem of parsing the response.

AdobeResponseDto.class

@Builder
@ToString
@AllArgsConstructor
@JsonInclude(JsonInclude.Include.NON_NULL)
@NoArgsConstructor
public class AdobeResponseDto {
    public Map<String, AdobeResponseFinal> adobeResponseWrapper = new HashMap<>();

    @JsonAnySetter
    public void setAdobeResponseWrapper(String name, AdobeResponseFinal value) {
        adobeResponseWrapper.put(name, value);
    }

    @JsonAnyGetter
    public Map<String, AdobeResponseFinal> getAdobeResponseWrapper() {
        return adobeResponseWrapper;
    }
}

AdobeResponseFinal.class

@Data
@Builder
@AllArgsConstructor
@NoArgsConstructor
public class AdobeResponseFinal {
    public String entityId;
    public MergePolicy mergePolicy;
}

I am calling the service like this:

final ResponseEntity<AdobeResponseDto> finalResponse;
finalResponse = aepClient.exchange(uri,HttpMethod.GET,entity,AdobeResponseDto.class);
final AdobeResponseDto body = finalResponse.getBody();

if(ObjectUtils.isNotEmpty(body)){
    return body;
}

But in this way, the response I am getting is

   {
    "adobeResponseWrapper": {
    "GvyArEFkg6JX6wI": {
        "entityId": "GvyArEFkg6JX6wI",
        "mergePolicy": {
            "id": "9245a39d-fe1a-4b33-acab-9bc5cbabf37c"
        }
     }

LHCHIN · Accepted Answer · 2022-01-14 01:38:38Z

2

If you just want to get the value of dynamic field name (e.g., "GvyArEFkg6JX6wI" in your case), you can just deserialize the response body to a Map and then traverse its value as follows:

ResponseEntity<String> finalResponse = aepClient.exchange(uri, HttpMethod.GET, entity, String.class);

ObjectMapper objectMapper = new ObjectMapper();
Map<String, Object> result = objectMapper.readValue(finalResponse.getBody(), Map.class);
result.values().forEach(System.out::println);

Console output:

{entityId=GvyArEFkg6JX6wI, mergePolicy={id=9245a39d-fe1a-4b33-acab-9bc5cbabf37c}}

And if you want to deserialize the response body to your DTO (I assume that there is only ONE root-level property), you can modify the DTO like:

public class AdobeResponseDto {
    private AdobeResponseFinal adobeResponseFinal;

    @JsonAnySetter
    public void setAdobeResponseFinal(String name, AdobeResponseFinal value) {
        adobeResponseFinal = value;
    }

    @JsonAnyGetter
    public AdobeResponseFinal getAdobeResponseFinal() {
        return adobeResponseFinal;
    }
}

Then you can get similar result as follows:

ResponseEntity<String> finalResponse = aepClient.exchange(uri, HttpMethod.GET, entity, String.class);
AdobeResponseDto adobeResponseDto = objectMapper.readValue(finalResponse.getBody(), AdobeResponseDto.class);
System.out.println(adobeResponseDto.getAdobeResponseFinal().toString());

Console output:

AdobeResponseFinal{entityId='GvyArEFkg6JX6wI', mergePolicy=MergePolicy{id='9245a39d-fe1a-4b33-acab-9bc5cbabf37c'}}

edited Jan 14, 2022 at 1:38

answered Jan 14, 2022 at 0:54

LHCHIN

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2 Comments

Mistu4u Over a year ago

Thank you, I followed the second approach but I am loosing the structure a little bit, I am getting exactly what you have written, so the dynamic property is missing in the response { "GvyArEFkg6JX6wI": {......}} I wanted to keep the original response intact.

LHCHIN Over a year ago

No problems! But I wonder know why you still want to keep the original response？

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