https://github.com/FasterXML/jackson-modules-java8/jackson-datatype-jdk8: Add-on module for Jackson (http://jackson.codehaus.org) to support JDK 8 data types. (FasterXML)
  • Tatu Saloranta
  • Christopher Currie
  • Paul Brown 
package com.fasterxml.jackson.datatype.jdk8;

import java.util.*;

import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.deser.Deserializers;
import com.fasterxml.jackson.databind.jsontype.TypeDeserializer;
import com.fasterxml.jackson.databind.type.ReferenceType;

public class Jdk8Deserializers extends Deserializers.Base
{
    @Override // since 2.7
    public JsonDeserializer<?> findReferenceDeserializer(ReferenceType refType,
            DeserializationConfig config, BeanDescription beanDesc,
            TypeDeserializer contentTypeDeserializer, JsonDeserializer<?> contentDeserializer)
    {
        if (refType.hasRawClass(Optional.class)) {
            return new OptionalDeserializer(refType, null, contentTypeDeserializer,contentDeserializer);
        }
        // 21-Oct-2015, tatu: Should probably consider possibility of custom deserializer being
        //    added to property; if so, `contentDeserializer` would not be null.
        //    Room for future improvement
        
        if (refType.hasRawClass(OptionalInt.class)) {
            return OptionalIntDeserializer.INSTANCE;
        }
        if (refType.hasRawClass(OptionalLong.class)) {
            return OptionalLongDeserializer.INSTANCE;
        }
        if (refType.hasRawClass(OptionalDouble.class)) {
            return OptionalDoubleDeserializer.INSTANCE;
        }
        return null;
    }
}