GSON Json Mapping for HashMap Nested Object

Question

I have a json context like below:

{
  "data": {
    "details": {
      "en-CA": {
        "languageCode": "en-CA",
        "isPrimaryLocale": false
      },
      "en-US": {
        "languageCode": "en-US",
        "isPrimaryLocale": true,
        "languageDisplayName": "English (United States)",
      }
    }
  }
}

To map it with GSON in java:

I created this classes:

public class ApiResponseSingleDto
{
    private ResponseDetail data;
}

public class ResponseDetail
{
    private ResponseDetails details;

    @Getter
    public static class ResponseDetails
    {
        public HashMap<String, LocaleDetail> row = new HashMap<>();
    }
}

public class LocaleDetail
{
    private String languageCode;
    private Boolean isPrimaryLocale;
    private String languageDisplayName;
}

When I try to map json to Java POJO class, HashMap doesn't work. Is there any suggestion?

To map it:

GSON.fromJson("...json", Type type...);

sf_ · Accepted Answer · 2020-01-29 14:39:18Z

1

Just try to replace:

public class ApiResponseSingleDto
{
    private ResponseDetail data;
}

public class ResponseDetail
{
    private Map<String, LocaleDetail> details;
}

public class LocaleDetail
{
    private String languageCode;
    private Boolean isPrimaryLocale;
    private String languageDisplayName;
}

Also json seems to be incorrect: "languageDisplayName": "English (United States)",

should be just "languageDisplayName": "English (United States)"

One more note: I believe you should have public fields or at least getters for them

edited Jan 29, 2020 at 14:39

answered Jan 29, 2020 at 14:26

sf_

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