Jackson deserialization of subtype fails when run with gradle

Question

I am getting an exception when running an integration test with gradle.

The exception I'm getting is:

com.fasterxml.jackson.databind.JsonMappingException: Can not construct instance of AbstractCommonDetails: abstract types either need to be mapped to concrete types, have custom deserializer, or contain additional type information

The Summary class has the following annotations on the details I am trying to deserialize:

@Data
public class Summary {
  @JsonTypeInfo(use = NAME, include = PROPERTY, property = "@type")
  @JsonSubTypes({
      @JsonSubTypes.Type(value = CardDetails.class, name = "CARD")
  })
  private AbstractCommonDetails details;
}

AbstractCommonDetails looks like this:

@Getter
@Setter
public abstract class AbstractCommonDetails {
  private Long id;
  public abstract String getPaymentMethod();
}

And the CardDetails has @JsonTypeName("CARD") and @Data annotations and the implementation of getPaymentMethod method.

ObjectMapper configuration and deserializing is done as follows:

new ObjectMapper().findAndRegisterModules().readValue(IOUtils.toString(inputStream, "UTF-8"), Summary.class);

And sample json:

{
  "details":{
    "@type":"CARD",
    "amount":"10.00"
}

Weird thing is - running the integration test as a Junit test succeeds but when running the same integration test with gradlew test command it fails with the exception mentioned before. What could be the cause?

Could you show us how `AbstractCommonDetails` class looks like? How do you run `Junit` test? In `IDE` or `Maven`? — Michał Ziober, Feb 25 '19 at 13:07
Junit test is run in IDE. Posted the code of AbstractCommonDetails — Janar, Feb 25 '19 at 13:54
if it does not work with `gradle` it means we need to configure somehow `Lambok` annotations to work. Could you check for example that [annotationProcessor gradle 4.7+ configuration doesn't run lombok](https://stackoverflow.com/questions/50519138/annotationprocessor-gradle-4-7-configuration-doesnt-run-lombok) — Michał Ziober, Feb 25 '19 at 14:18
I'll try removing lombok annotations and running the tests to verify if that is where the problem lies. — Janar, Feb 25 '19 at 14:39
@MichałZiober removing lombok annotations indeed fixed the problem - I'll try getting it to work using the example with lombok. thanks! — Janar, Feb 25 '19 at 14:51

score 0 · Accepted Answer · answered Feb 25 '19 at 15:09

If test works on IDE but does not work with gradle it means you need to take a look on gradle configuration. You use Lambook, so you need to be sure that gradle configuration is aware about Lambok annotations.

Jackson deserialization of subtype fails when run with gradle

1 Answers1