JSON Mapper

import com.anjunar.json.mapper.provider.DTO
import jakarta.json.bind.annotation.JsonbProperty
import scala.annotation.meta.field

class AddressDto extends DTO {
  @(JsonbProperty @field) var city: String = null
}

class UserDto extends DTO {
  @(JsonbProperty @field) var name: String = null
  @(JsonbProperty @field) var address: AddressDto = null
}

import com.anjunar.json.mapper.{EntityLoader, JsonMapper}
import com.anjunar.json.mapper.intermediate.JsonParser
import com.anjunar.scala.universe.TypeResolver
import jakarta.validation.Validation
import java.util.UUID

val user = new UserDto
user.address = new AddressDto
val validator = Validation.buildDefaultValidatorFactory().getValidator
val loader = new EntityLoader {
  override def load(id: UUID, clazz: Class[?]): Any = null
}

val updated = JsonMapper.deserialize(
  JsonParser.parse("{\"name\":\"Ada\",\"address\":{\"city\":\"Berlin\"}}"),
  user,
  TypeResolver.resolve(classOf[UserDto]),
  null, // optional EntityGraph
  loader,
  [T] => (_: Class[T]) => null.asInstanceOf[T],
  validator
).asInstanceOf[UserDto]

assert(updated eq user)
assert(user.address.city == "Berlin")