Staged builder breaks jackson deserialization of nullable fields

[SimY4]

Consider an entity definition:

@Value.Immutable
@Value.Style(stagedBuilder = true)
@JsonDeserialize(as = ImmutableEntity.class)
public interface Entity {
  @Value.Default
  default String getNullableDefault() {
    return "default";
  }
}

and a JSON string: {"nullableDefault":null}

This would fail jackson deserialisation with:

Can not construct instance of org.immutables.fixture.jackson.ImmutableEntity, problem: nullableDefault
 at [Source: {"nullableDefault":null}; line: 1, column: 40]
	at org.immutables.fixture.jackson.ObjectMappedTest.jsonNullableWithDefault(ObjectMappedTest.java:252)
Caused by: java.lang.NullPointerException: nullableDefault
	at org.immutables.fixture.jackson.ObjectMappedTest.jsonNullableWithDefault(ObjectMappedTest.java:252)

If you remove @Value.Style serialization works as expected.

[elucash]

Thank you for reporting this. It's hard to dig every feature combination, especially with quite complex Jackson mapping. Here I would ask for help, If staged builder is involved then how it exactly affects Jackson so it doesn't work? One can, for example, take the generated code and out it into a source folder, remove @Value.Immutable annotation and try to fiddle / debug the code to find out what causes the problem.