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Serialization - Class extends HashMap #3173

@samuelfac

Description

@samuelfac

I'm using jackson-databind version 2.12.3 with java8

Create myObject:

  MyObject myObject = new MyObject();
  myObject.setField1("value1");
  myObject.setField2("value2");

  Link link = new Link();
  link.setField(new HrefType().href("/link"));
  link.put("test",new HrefType().href("/test"));

  myObject.setLinks(link);

on serialize myObject should return like this:

{
  "field1":"value1",
  "field2":"value2",
  "links":{
    "field":{
      "href":"/link"
    },
    "test":{
      "href":"/test"
    }
  }
}

But with the default ObjectMapper the "myObject.link.field" is ignored and the returned json is:

{
  "field1":"value1",
  "field2":"value2",
  "links":{
    "test":{
      "href":"/test"
    }
  }
}

My classes are these:

public class Link extends HashMap<String, HrefType>  {
  private HrefType field = null; //ERROR: this field is ignored on serializer
  ...
}

public class HrefType  {
  private String href = null;
  ...
}

public class MyObject  {
  private String field1 = null;
  private String field2 = null;
  private Link links = null;
  ...
}

I think it's a bug which ignores the fields of the class that extends a hashmap

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