Unable to deserialize when using new Record classes

Question

I am trying to see if I can replace my existing Pojos with the new Record classes in Java 14. But unable to do so. Getting following error:

com.faste

Answer 1

• Use the parameter names module for jackson, https://github.com/FasterXML/jackson-modules-java8/tree/master/parameter-names (make sure the compiler sets -parameters) or add `@JsonProperty("name") to each field in the record
• add @JsonCreator to the constructor. I can't tell if the inheritance will work properly, so you might have to explicitly declare the constructor and annotate it.

If a public accessor method or (non-compact) canonical constructor is declared explicitly, then it only has the annotations which appear on it directly; nothing is propagated from the corresponding record component to these members.

From https://openjdk.java.net/jeps/384

So add

new ObjectMapper().registerModules(new ParameterNamesModule())

and try

@JsonCreator record Value(String x);

or something like

record Value(String x) {

@JsonCreator
public Value(String x) {
this.x = x;
}
}

or all the way to

record Value(@JsonProperty("x") String x) {

@JsonCreator
public Value(@JsonProperty("x") String x) {
this.x = x;
}
}

This is how I get immutable pojos with lombok and jackson to work, and I don't see why records wouldn't work under the same format. My setup is Jackson parameter names module, -parameters compiler flag for java 8 (I don't think this is required for like jdk9+), @JsonCreator on the constructor. Example of a real class working with this setup.

@Value
@AllArgsConstructor(onConstructor_ = @JsonCreator)
public final class Address {

  private final String line1;

  private final String line2;

  private final String city;

  private final String region;

  private final String postalCode;

  private final CountryCode country;
}