Jackson26xRegression.java

package com.grinstone.entity.design;

import static com.google.common.base.Preconditions.checkNotNull;
import static org.junit.Assert.assertEquals;

import java.io.IOException;
import java.util.Optional;

import org.junit.Test;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonSubTypes;
import com.fasterxml.jackson.annotation.JsonSubTypes.Type;
import com.fasterxml.jackson.annotation.JsonTypeInfo;
import com.fasterxml.jackson.annotation.JsonTypeInfo.As;
import com.fasterxml.jackson.annotation.JsonTypeInfo.Id;
import com.fasterxml.jackson.databind.ObjectMapper;

import lombok.Value;

public class JacksonBugTest {

  private static final ObjectMapper MAPPER = new ObjectMapper();
  
  static {
    // Have JDK 8 module in classpath
    MAPPER.findAndRegisterModules();
  }
  
  @Value
  public static class Container {
    Optional<Contained> contained;

    @JsonCreator
    public Container(@JsonProperty("contained") final Optional<Contained> contained) {
      super();
      this.contained = checkNotNull(contained);
    }
    
    public Optional<Contained> getContained() {
      return contained;
    }
  }
  
  @JsonTypeInfo(use = Id.NAME, include = As.PROPERTY)
  @JsonSubTypes({
      @Type(name = "ContainedImpl", value = ContainedImpl.class),
      @Type(name = "AnotherContainedImpl", value = AnotherContainedImpl.class)
  })
  public static interface Contained {
    
  }
  
  @Value
  public static class ContainedImpl implements Contained {
    
  }
  
  @Value
  public static class AnotherContainedImpl implements Contained {
    
  }
  
  @Test
  public void shouldSerializeCorrectly() throws IOException {
      final Container dto = new Container(Optional.of(new AnotherContainedImpl()));
      
      final String json = MAPPER.writeValueAsString(dto);
      final Container fromJson = MAPPER.readValue(json, Container.class);
      assertEquals(dto, fromJson);
  }
}