Cannot deserialize object: no String-argument constructor/factory method to deserialize from String value

[mozzer39]

Hi!
I'm trying to migrate from Jackson 2 to Jackson 3 and I have a problem with deserializing my request. Here's my request class:

@NoArgsConstructor
@AllArgsConstructor
@Data
@Builder
public class SampleRequest {
    private String field1;
    private NestedClass field2;
}

@NoArgsConstructor
@AllArgsConstructor
@Data
@Builder
public class NestedClass {
    private String field;
}

With Jackson 2 I was able to successfully deserialize the following json:

{
  "field1": "sampleValue",
  "field2": "sampleValue"
}

Unfortunately with Jackson 3 I'm gettting an error:
Resolved [org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Cannot construct instance of com.test.domain.NestedClass (although at least one Creator exists): no String-argument constructor/factory method to deserialize from String value ('sampleValue')]

Why I'm getting this although there is a constructor in NestedClass?

[pjfanning]

Jackson 3 has many default settings that are different from Jackson 2.
https://github.com/FasterXML/jackson/blob/main/jackson3/MIGRATING_TO_JACKSON_3.md describes the changes.

You may want to try making Jackson 3 use the Jackson 2 default configs (documented in link above)

[mozzer39]

So I managed to fix the issue by adding:
@AllArgsConstructor(onConstructor_ = @JsonCreator(mode = JsonCreator.Mode.DELEGATING))
to the NestedClass

[cowtowncoder]

This is the proper solution.