ObjectMapper.writerWithType has no effect in 2.3.0

[jhalterman]

I'm using ObjectMapper.writerWithType on an ObjectMapper that has SerializationFeature.WRAP_ROOT_VALUE enabled to override the rootType when writing a value as a string. Specifically I'm doing this to ensure that proxied types have their parent class name written instead of the proxy class name.

This worked fine with 2.1.1. Did something change?

[cowtowncoder]

It sounds like this could well be a be a bug. But I am not sure I follow the exact problem, so it would be great if you could come up with a simple unit test. And hopefully fix the problem.

[jhalterman]

Sure - Here's a simple failing test:

public static class TestCommandParent {
    public String uuid;
    public int type;
 }

 public static class TestCommandChild extends TestCommandParent {
 }

public void test() {
    TestCommandChild cmd = new TestCommandChild();
    cmd.uuid = "1234";
    cmd.type = 1;

    ObjectMapper mapper = new ObjectMapper();
    mapper.configure(SerializationFeature.WRAP_ROOT_VALUE, true);
    ObjectWriter writer = mapper.writerWithType(TestCommandParent.class);
    String result =  writer.writeValueAsString(cmd);

    assertEquals("{\"TestCommandParent\":{\"uuid\":\"1234\",\"type\":1}}", result);
}

The actual result is {"TestCommandChild":{"uuid":"1234","type":1}}

[cowtowncoder]

Fixed; was simply not using root type for locating root name to use. Will be in 2.3.2 (and 2.4)