Testcase for https://github.com/FasterXML/jackson-databind/issues/639

Main.java

package com.mycompany.jackson639;

import com.fasterxml.jackson.annotation.JacksonInject;
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonIdentityInfo;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.ObjectIdGenerators;
import com.fasterxml.jackson.databind.InjectableValues;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.File;
import java.io.IOException;
import java.util.Optional;

public class Main {

    public static final class Context {

    }

    @JsonIdentityInfo(generator = ObjectIdGenerators.IntSequenceGenerator.class)
    public static final class Parent1 {

        @JsonProperty
        public Optional<Child1> child;

        @JsonCreator
        public Parent1() {
        }
    }

    @JsonIdentityInfo(generator = ObjectIdGenerators.IntSequenceGenerator.class)
    public static final class Parent2 {

        private final Context context;
        @JsonProperty
        public Optional<Child2> child;

        @JsonCreator
        public Parent2(@JacksonInject Context context) {
            this.context = context;
        }
    }

    @JsonIdentityInfo(generator = ObjectIdGenerators.IntSequenceGenerator.class)
    public static final class Child1 {

        @JsonProperty
        private final Parent1 parent;

        @JsonCreator
        public Child1(@JsonProperty("parent") Parent1 parent) {
            this.parent = parent;
        }
    }

    @JsonIdentityInfo(generator = ObjectIdGenerators.IntSequenceGenerator.class)
    public static final class Child2 {

        private final Context context;
        @JsonProperty
        private final Parent2 parent;

        @JsonCreator
        public Child2(@JacksonInject Context context,
                @JsonProperty("parent") Parent2 parent) {
            this.context = context;
            this.parent = parent;
        }
    }

    public static void main(String[] args) throws IOException {
        ObjectMapper mapper = new ObjectMapper();
        Context context = new Context();
        InjectableValues iv = new InjectableValues.Std().
                addValue(Context.class, context);
        mapper.setInjectableValues(iv);

        Parent1 parent1 = new Parent1();
        Child1 child1 = new Child1(parent1);
        parent1.child = Optional.of(child1);

        Parent2 parent2 = new Parent2(context);
        Child2 child2 = new Child2(context, parent2);
        parent2.child = Optional.of(child2);

        File file = new File("target/test1.xml");
        mapper.writeValue(file, parent1);
        parent1 = mapper.readValue(file, Parent1.class);
        System.out.println("This works: " + parent1);

        file = new File("target/test2.xml");
        mapper.writeValue(file, parent1);
        parent2 = mapper.readValue(file, Parent2.class);
        System.out.println("This fails: " + parent2);
    }
}