Code snippets to use a Jackson 2 `ObjectMapper` and `JsonNode` to generate JSON documents.

Jackson 2 `ObjectMapper` initialization.java

ObjectMapper objectMapper = new ObjectMapper()
    // Find and register modules e.g. for serialization or JAXB annotation processing
    .findAndRegisterModules()
    // Order map entries by key
    .enable(SerializationFeature.ORDER_MAP_ENTRIES_BY_KEYS)
    // Don't fail on empty beans
    .disable(SerializationFeature.FAIL_ON_EMPTY_BEANS)
    // Write date values as timestamp instead of ms since epoch
    .enable(SerializationFeature.WRITE_DATE_KEYS_AS_TIMESTAMPS)
    // Don't include default view / non @JsonView annotaded values
    .disable(MapperFeature.DEFAULT_VIEW_INCLUSION)
    // Only include non empty values
    .setSerializationInclusion(JsonInclude.Include.NON_EMPTY);

// Set @JsonView for the mapper
objectMapper.setConfig(
    objectMapper.getSerializationConfig()
    .withView(Views.MyView.class));

// Customize Use if you want to customize the date format
SimpleDateFormat dateformat = new SimpleDateFormat("dd.MM.yyyy HH:mm:ss");
objectMapper.setDateFormat(dateformat);


// Create the node factory that gives us nodes.
JsonNodeFactory factory = new JsonNodeFactory(false);

// create a json factory to write the treenode as json. for the example
// we just write to console
JsonFactory jsonFactory = new JsonFactory();
// Generate to `outputStream`
OutputStream outputStream = new ByteArrayOutputStream();
JsonGenerator generator = jsonFactory.createGenerator(outputStream);

// Set the ObjectMapper to encode/decode POJOs
generator.setCodec(objectMapper);

// the root node
final ObjectNode myRootNode = factory.objectNode();

// ...

// Serialize a POJO using the mapper and add a custom node
final ObjectNode node = objectMapper.valueToTree(myPOJO);
node.putString("my-custom-property", "Duke")
myRootNode.set("my-pojo", node);


// Finally generate the JSON document
objectMapper.writeValue(generator, siteDefinitionNode);