Jackson makes extra initialization after @JsonCreator was called

Question

I have a simple class A :

@Getter
@RequiredArgsConstructor(access = AccessLevel.PACKAGE)
class A {

  private final String incomeField;
  private final String anotherIncomeField;
  private final String fixedValueField;

}

class B extends A {

  private B(final String incomeField, final String anotherIncomeField) {
    super(incomeField, anotherIncomeField, "someFixedValue");
  }

  @JsonCreator
  public static B of(@JsonProperty("incomeField") final String incomeField, @JsonProperty("anotherIncomeField") final String anotherIncomeField) {
      return new B(incomeField, anotherIncomeField);
  }
}

When I push a message to ActiveMQ via jmsTemplate.convertAndSend(destination, new B("foo", "bar")) , the actual message in queue is the following:

{
   "incomeField": "foo",
   "anotherIncomeField": "bar",
   "fixedValueField": null
}

I handle JMS messages with @JmsListener(destination = "my-destination) and receive an object of type B with fixedValueField set to null , while I expect it to be someFixedValue as I set it in private constructor.

When I debug all this stuff, I see that @JsonCreator is called correctly and my object has expected values for all fields, but when Jackson finishes deserialization, I see that fixedValueField is null . Why this can happen?

Note that all the fields are final

Environment:

• Java 11
• Spring Boot 2.1.3.RELEASE
• Jackson 2.9.8
• ActiveMQ 5.15.8

Answer 1

This is the answer why this works in such way - stackoverflow.com/a/30341178/4760059

This is possible a fix - stackoverflow.com/a/42142268/4760059