spring boot - Convert JSON String (Which includes different lenients) to Java Class with RestTemplate

Question

I have a json string like:

{
   "name": "abc",
   "type": "type1",
   "artist": {
       "name": "ally"
   },
   "other_part": "{"id":"ee50abd7","metadata":"..."}"
}

Like you see, "other_part" looks like in lenient format. It presents with quotation mark.

Here, I just want to convert it to a POJO class. But other_part gives parse error. Any suggestion.

POJO Class:

class Data
{
   private String name;
   private String type;
   private Artist artist;
   private Other other_part;
   ...getters
} 
class Artist
{
   private String name;
   ...getters
} 
class Other
{
   private String id;
   private String metadata;
   ...getters
} 

and restTemplate:

restTemplate.exchange(requestEntity, Data.class);

Error:

(although at least one Creator exists): no String-argument constructor/factory method to deserialize from String value...

Thanks guys solved with JsonDeserialize:

public static class OtherConverter extends StdConverter<String, Other>
{

    @Override
    public Other convert(String value)
    {
        return new Gson().fromJson(value, Other.class);
    }
}

class Data
{
   private String name;
   private String type;
   private Artist artist;

   @JsonDeserialize( converter = OtherConverter.class )
   private Other other_part;
   ...getters
}

Answer 1

You will probably need to create a custom deserializer.

   @JsonDeserialize(using = CustomDateDeserializer.class) 
   private Other other_part;

Inside the custom serializer you will receive the string information. Then you can transform this string using a library of choice.

Example: https://www.tutorialspoint.com/jackson_annotations/jackson_annotations_jsondeserialize.htm