Throw error if strings are not double quoted while using jackson objectmapper deserialization

user_9578985 0
Viewed 678

I have a JSON:

{
    "stringField" : 1234,
    "booleanField": true,
    "numberField": 1200.00
}

I use object mapper to deserialize the json into:-

@Data
class SomeClass {
    String stringField;
    boolean booleanField;
    float numberField;
}

I would like the objectMapper to throw an error because, the values for String fields must be double quoted according to the json spec. How can i get objectMapper to throw an error?

objectmapper jackson java
3 Answers

You can write custom string deserializer.(i assume you are using spring)

@Configuration
public class JacksonConfiguration {

    @Bean
    SimpleModule jacksonDeserializerConfiguration() {
        SimpleModule module = new SimpleModule();
        module.addDeserializer(String.class, new StdDeserializer<String>(String.class) {
        @Override
        public String deserialize(JsonParser parser, DeserializationContext context)
                throws IOException {
             if (!parser.hasToken(JsonToken.VALUE_STRING)) {
                //throw ex what do u want
                throw new RuntimeException("String not include quote");
            }
            return StringDeserializer.instance.deserialize(parser, context);
        }
    });
        return module;
    }
}
user_61710250

This should fix your issue.

class SomeClass {
    @JsonDeserialize(using=ForceStringDeserializer.class)
    public String stringField;
    public boolean booleanField;
    public float numberField;
}


class ForceStringDeserializer extends JsonDeserializer<String> {
    @Override
    public String deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException {
        if (jsonParser.getCurrentToken() != JsonToken.VALUE_STRING) {
            throw deserializationContext.wrongTokenException(jsonParser, JsonToken.VALUE_STRING, "Attempted to parse Integer to String but this is forbidden");
        }
        return jsonParser.getValueAsString();
    }
}
user_83126060

You just need to setup jackson objectmapper like this

JsonFactory factory = new JsonFactory();
factory.disable(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES);
ObjectMapper mapper = new ObjectMapper(factory)

This should throw error during serialization/deserilaization

user_5696910
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