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JsonNullable wrapper class and Jackson module to support fields with meaningful null values.

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package org.openapitools.jackson.nullable;

import com.fasterxml.jackson.databind.BeanDescription;
import com.fasterxml.jackson.databind.DeserializationConfig;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.deser.Deserializers;
import com.fasterxml.jackson.databind.jsontype.TypeDeserializer;
import com.fasterxml.jackson.databind.type.ReferenceType;

public class JsonNullableDeserializers extends Deserializers.Base {

    @Override
    public JsonDeserializer findReferenceDeserializer(ReferenceType refType,
                                                         DeserializationConfig config, BeanDescription beanDesc,
                                                         TypeDeserializer contentTypeDeserializer, JsonDeserializer contentDeserializer) {
        return (refType.hasRawClass(JsonNullable.class)) ? new JsonNullableDeserializer(refType, null, contentTypeDeserializer,contentDeserializer) : null;
    }
}