[FIXED] How can I decode a response as a list?

Issue

I receive this response:

[{"id":1,"someField":"someValue"}]

Here is my request:

private HttpRequest doRequest(String body, URI uri) {
    return HttpRequest.newBuilder()
            .POST(HttpRequest.BodyPublishers.ofString(body))
            .uri(uri)
            .headers(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON)
            .build();
}

and I tried to do this, but, it didn't work:

protected ClassToDecode createResponse(HttpResponse<HttpBodyCodec> response) {
    return response.body().decodeAs(ClassOfResponse.class);
}

My ClassToDecode has a list of my response class:

@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@ToString
@Builder
@EqualsAndHashCode
public class ClassToDecode {
    private List<ClassResponse> responses;
}

and my ClassResponse with the fields to decode:

@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@ToString
@Builder
@EqualsAndHashCode
public class ClassResponse  {

  @JsonProperty("id")
  private Integer id = null;

  @JsonProperty("someField")
  private String someField = null;

}

Doing this way, the fields are not filled with the response. I'm not able to decode the list I receive, how should I do it?

Solution

the reason why your class ClassToDecode doesn't work is because it's trying to find the key responses into the the json object, something like this:

{"responses":[{"id":1,"someField":"someValue"}]}

the easiest way to do what you want is:

public class ClassToDecode extends ArrayList<ClassResponse> {
}

This should we work, and help you to decode.

regards.

Answered By - Marco
Answer Checked By - David Marino (JavaFixing Volunteer)