[jackson-user] Default typing with interface and implementation

[itineric itineric]

Hi all,

I'm trying to work with interfaces and related bean implementation of that 
interface. So far, all good.
I then tried to add some Map<String, Object> to the equation and I cannot 
understand why I get this result.
Short story: I'm trying to get the @class to be set to the interface name 
using a TypeIdResolver and it work as expected on a direct call but not 
when the object is inside a Map.
I simplified everything to get an example, here it is :

UserInterface.java
@JsonTypeInfo(use = Id.CLASS)
@JsonTypeIdResolver(UserTypeResolver.class)
public interface UserInterface
{
  String getName();
}

UserImplementation.java
public class UserImplementation implements UserInterface
{
  private String name;

  @Override
  public String getName()
  {
    return this.name;
  }

  public void setName(final String name)
  {
    this.name = name;
  }
}

UserTypeResolver.java
public class UserTypeResolver implements TypeIdResolver
{
  private JavaType baseType;

  @Override
  public void init(final JavaType baseType)
  {
    this.baseType = baseType;
  }

  @Override
  public String idFromValue(final Object value)
  {
    return idFromValueAndType(value, value.getClass());
  }

  @Override
  public String idFromValueAndType(final Object value, final Class<?> 
suggestedType)
  {
    return "com.example.jackson.UserInterface";
  }

  @Override
  public String idFromBaseType()
  {
    return idFromValueAndType(null, this.baseType.getRawClass());
  }

  @Override
  public JavaType typeFromId(final DatabindContext context, final String id)
    throws IOException
  {
    return 
TypeFactory.defaultInstance().constructSpecializedType(this.baseType, 
UserImplementation.class);
  }

  @Override
  public String getDescForKnownTypeIds()
  {
    return null;
  }

  @Override
  public Id getMechanism()
  {
    return Id.CLASS;
  }
}

And finally the test I played:

    final UserImplementation user = new UserImplementation();
    user.setName("test");

    final Map<String, Object> parameters = new HashMap<>();
    parameters.put("user", user);

    final ObjectMapper mapper = new ObjectMapper();
    mapper.enableDefaultTyping(DefaultTyping.JAVA_LANG_OBJECT, As.PROPERTY);

    StringWriter writer = new StringWriter();
    mapper.writeValue(writer, user);
    System.out.println(writer);

    writer = new StringWriter();
    mapper.writeValue(writer, parameters);
    System.out.println(writer);

The output is:
{"@class":"com.example.jackson.UserInterface","name":"test"}
{"user":{"@class":"com.example.jackson.UserImplementation","name":"test"}}

The expected output I'd like to see:
{"@class":"com.example.jackson.UserInterface","name":"test"}
{"user":{"@class":"com.example.jackson.UserInterface  ","name":"test"}}

What am I doing wrong? Is that the expected output? What could I do to get 
the one I expect?

Thank you


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