main.scala

import com.fasterxml.jackson.annotation.JsonInclude.Include
import com.fasterxml.jackson.databind.{ObjectMapper, SerializationFeature}
import com.fasterxml.jackson.datatype.jdk8.Jdk8Module
import com.fasterxml.jackson.module.scala.DefaultScalaModule
import java.time.Instant
import no.ssb.jsonstat.JsonStatModule
import no.ssb.jsonstat.v2.{Dataset, Dimension}

val mapper = new ObjectMapper()
mapper.registerModule(new DefaultScalaModule())
mapper.registerModule(new Jdk8Module())
mapper.registerModule(new JsonStatModule())
mapper.setSerializationInclusion(Include.NON_EMPTY)

val builder = Dataset.create().
  withLabel("test label").
  updatedAt(Instant.now()).
  withDimension(Dimension.create("A").withCategories("A1", "A2", "A3")).
  withDimension(Dimension.create("B").withCategories("B1", "B2")).
  withDimension(Dimension.create("C").withCategories("C1", "C2", "C3", "C4"))

mapper.writeValueAsString(builder.build())

output.json

{
	"version": "2.0",
	"id": ["A", "B", "C"],
	"size": [3, 2, 4],
	"label": "test label",
	"updated": {
		"nano": 778000000,
		"epochSecond": 1480441799
	},
	"dimension": {
		"A": {
			"version": "2.0",
			"category": {
				"label": {
					"A1": "A1",
					"A2": "A2",
					"A3": "A3"
				},
				"index": ["A1", "A2", "A3"]
			},
			"class": "dimension"
		},
		"B": {
			"version": "2.0",
			"category": {
				"label": {
					"B1": "B1",
					"B2": "B2"
				},
				"index": ["B1", "B2"]
			},
			"class": "dimension"
		},
		"C": {
			"version": "2.0",
			"category": {
				"label": {
					"C1": "C1",
					"C2": "C2",
					"C3": "C3",
					"C4": "C4"
				},
				"index": ["C1", "C2", "C3", "C4"]
			},
			"class": "dimension"
		}
	},
	"class": "dataset"
}