Cannot Change Default Abstract Type Mapper from LinkedHashMap

[wealdtech]

An attempt to change the default abstract type mapper from LinkedHashMap to something else (in this case TreeMap) does not work:

  public static void main(String ... args) throws Exception
  {
    final ObjectMapper mapper = new ObjectMapper();
    final SimpleModule module = new SimpleModule("treemaps", Version.unknownVersion());
    module.addAbstractTypeMapping(Map.class, TreeMap.class);
    mapper.registerModule(module);

    final String ser = "{\"obj\":{\"k1\":\"v1\",\"k2\":\"v2\",\"k3\":\"v3\"}}";
    final Map<String, Object> deser = mapper.readValue(ser, new TypeReference<TreeMap<String, Object>>() {});
    System.out.println("Class of deser's nested object is " + deser.get("obj").getClass().getSimpleName());
  }

The output of this is Class of deser's nested object is LinkedHashMap.

This is using version 2.5.0.

[cowtowncoder]

Thank you for reporting this. Sounds like mapping is only applied to main level of deserialization here.

[cowtowncoder]

I can reproduce this locally with 2.5.1.