src/test/java/com/fasterxml/jackson/databind/objectid/ObjectWithCreator1261Test.java

package com.fasterxml.jackson.databind.objectid;

import java.util.*;

import com.fasterxml.jackson.annotation.*;
import com.fasterxml.jackson.databind.*;

public class ObjectWithCreator1261Test
    extends BaseMapTest
{
    static class Answer
    {
       public SortedMap<String, Parent> parents;

       public Answer() {
           parents = new TreeMap<String, Parent>();
       }
    }

    @JsonIdentityInfo(generator = ObjectIdGenerators.IntSequenceGenerator.class, property = "@id")
    static class Parent
    {
       public Map<String, Child> children;

       @JsonIdentityReference(alwaysAsId = true)
       public Child favoriteChild;

       public String name;

       protected Parent() { }
       
       public Parent(String name, boolean ignored) {
           children = new TreeMap<String, Child>();
           this.name = name;
       }
    }

    @JsonInclude(JsonInclude.Include.NON_NULL)
    @JsonIdentityInfo(generator = ObjectIdGenerators.IntSequenceGenerator.class, property = "@id")
    static class Child
    {
        public String name;

        @JsonIdentityReference(alwaysAsId = true)
        public Parent parent;

        @JsonIdentityReference(alwaysAsId = true)
        public List<Parent> parentAsList;

        public String someNullProperty;

        protected Child() { }
        
        @JsonCreator
        public Child(@JsonProperty("name") String name,
              @JsonProperty("someNullProperty") String someNullProperty) {
            this.name = name;
            this.someNullProperty = someNullProperty;
        }

        public Child(String n) {
            name = n;
        }
    }

    public void testObjectIds1261() throws Exception
    {
         ObjectMapper mapper = jsonMapperBuilder()
                 .enable(SerializationFeature.INDENT_OUTPUT)
             .enable(MapperFeature.SORT_PROPERTIES_ALPHABETICALLY)
             .build();

         Answer initialAnswer = createInitialAnswer();
         String initialAnswerString = mapper.writeValueAsString(initialAnswer);
// System.out.println("Initial answer:\n"+initialAnswerString);
         JsonNode tree = mapper.readTree(initialAnswerString);
         Answer deserializedAnswer = mapper.readValue(initialAnswerString,
               Answer.class);
         String reserializedAnswerString = mapper
               .writeValueAsString(deserializedAnswer);
         JsonNode newTree = mapper.readTree(reserializedAnswerString);
         if (!tree.equals(newTree)) {
                  fail("Original and recovered Json are different. Recovered = \n"
                        + reserializedAnswerString + "\n");
         }
   }

   private Answer createInitialAnswer() {
      Answer answer = new Answer();
      String child1Name = "child1";
      String child2Name = "child2";
      String parent1Name = "parent1";
      String parent2Name = "parent2";
      Parent parent1 = new Parent(parent1Name, false);
      answer.parents.put(parent1Name, parent1);
      Child child1 = new Child(child1Name);
      child1.parent = parent1;
      child1.parentAsList = Collections.singletonList(parent1);
      Child child2 = new Child(child2Name);
      Parent parent2 = new Parent(parent2Name, false);
      child2.parent = parent2;
      child2.parentAsList = Collections.singletonList(parent2);
      parent1.children.put(child1Name, child1);
      parent1.children.put(child2Name, child2);
      answer.parents.put(parent2Name, parent2);
      return answer;
   }
}