Java 类com.fasterxml.jackson.annotation.JsonInclude 实例源码

@Test
@SuppressWarnings({"rawtypes", "unchecked"})
public void annotationStyleMoshi1ProducesMoshi1Annotations() throws ClassNotFoundException, SecurityException, NoSuchMethodException, NoSuchFieldException {

    Class generatedType = schemaRule.generateAndCompile("/json/examples/torrent.json", "com.example",
            config("annotationStyle", "moshi1",
                    "propertyWordDelimiters", "_",
                    "sourceType", "json"))
            .loadClass("com.example.Torrent");

    assertThat(schemaRule.getGenerateDir(), not(containsText("org.codehaus.jackson")));
    assertThat(schemaRule.getGenerateDir(), not(containsText("com.fasterxml.jackson")));
    assertThat(schemaRule.getGenerateDir(), not(containsText("com.google.gson")));
    assertThat(schemaRule.getGenerateDir(), not(containsText("@SerializedName")));
    assertThat(schemaRule.getGenerateDir(), containsText("com.squareup.moshi"));
    assertThat(schemaRule.getGenerateDir(), containsText("@Json"));

    Method getter = generatedType.getMethod("getBuild");

    assertThat(generatedType.getAnnotation(JsonPropertyOrder.class), is(nullValue()));
    assertThat(generatedType.getAnnotation(JsonInclude.class), is(nullValue()));
    assertThat(getter.getAnnotation(JsonProperty.class), is(nullValue()));
}

@Test
@SuppressWarnings({ "rawtypes", "unchecked" })
public void customAnnotatorCanBeAppliedAlongsideCoreAnnotator() throws ClassNotFoundException, SecurityException, NoSuchMethodException {

    ClassLoader resultsClassLoader = schemaRule.generateAndCompile("/schema/properties/primitiveProperties.json", "com.example",
            config("customAnnotator", DeprecatingAnnotator.class.getName()));

    Class generatedType = resultsClassLoader.loadClass("com.example.PrimitiveProperties");

    Method getter = generatedType.getMethod("getA");

    assertThat(generatedType.getAnnotation(JsonPropertyOrder.class), is(notNullValue()));
    assertThat(generatedType.getAnnotation(JsonInclude.class), is(notNullValue()));
    assertThat(getter.getAnnotation(JsonProperty.class), is(notNullValue()));

    assertThat(generatedType.getAnnotation(Deprecated.class), is(notNullValue()));
    assertThat(generatedType.getAnnotation(Deprecated.class), is(notNullValue()));
    assertThat(getter.getAnnotation(Deprecated.class), is(notNullValue()));
}

public JsonMapper() {
    // calls the default constructor
    super();

    // configures ISO8601 formatter for date without time zone
    // the used format is 'yyyy-MM-dd'
    super.setDateFormat(new SimpleDateFormat(FMT_ISO_LOCAL_DATE));

    // enforces to skip null and empty values in the serialized JSON output
    super.setSerializationInclusion(JsonInclude.Include.NON_EMPTY);

    // enforces to skip null references in the serialized output of Map
    super.configure(SerializationFeature.WRITE_NULL_MAP_VALUES, false);

    // enables serialization failures, when mapper encounters unknown properties names
    super.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, true);

    // configures the format to prevent writing of the serialized output for java.util.Date
    // instances as timestamps. any date should be written in ISO format
    super.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
}

/**
 * Convert an object to JSON byte array.
 *
 * @param object
 *            the object to convert
 * @return the JSON byte array
 * @throws IOException
 */
public static byte[] convertObjectToJsonBytes(Object object)
        throws IOException {
    ObjectMapper mapper = new ObjectMapper();
    mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);

    JavaTimeModule module = new JavaTimeModule();
    module.addSerializer(OffsetDateTime.class, JSR310DateTimeSerializer.INSTANCE);
    module.addSerializer(ZonedDateTime.class, JSR310DateTimeSerializer.INSTANCE);
    module.addSerializer(LocalDateTime.class, JSR310DateTimeSerializer.INSTANCE);
    module.addSerializer(Instant.class, JSR310DateTimeSerializer.INSTANCE);
    module.addDeserializer(LocalDate.class, JSR310LocalDateDeserializer.INSTANCE);
    mapper.registerModule(module);

    return mapper.writeValueAsBytes(object);
}

private static ObjectMapper initializeMapper() {
    return new ObjectMapper()
            .registerModule(new JavaTimeModule())

            .disable(MapperFeature.AUTO_DETECT_GETTERS)
            .disable(MapperFeature.AUTO_DETECT_CREATORS)
            .disable(MapperFeature.AUTO_DETECT_SETTERS)
            .disable(MapperFeature.AUTO_DETECT_IS_GETTERS)
            .disable(MapperFeature.AUTO_DETECT_FIELDS)
            .disable(MapperFeature.DEFAULT_VIEW_INCLUSION)
            .setVisibility(PropertyAccessor.FIELD, JsonAutoDetect.Visibility.NONE)
            .enable(MapperFeature.SORT_PROPERTIES_ALPHABETICALLY)
            .enable(MapperFeature.CAN_OVERRIDE_ACCESS_MODIFIERS)

            // serialization
            .disable(SerializationFeature.FAIL_ON_EMPTY_BEANS)
            .enable(SerializationFeature.USE_EQUALITY_FOR_OBJECT_ID)
            .setSerializationInclusion(JsonInclude.Include.NON_EMPTY)
            .disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS)

            // deserialization
            .disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES)
            .enable(DeserializationFeature.READ_UNKNOWN_ENUM_VALUES_USING_DEFAULT_VALUE);
}

public SiloTemplateResolver(Class<T> classType) {
    ObjectMapper m = new ObjectMapper();
    m.registerModule(new GuavaModule());
    m.registerModule(new LogbackModule());
    m.registerModule(new GuavaExtrasModule());
    m.registerModule(new JodaModule());
    m.registerModule(new JSR310Module());
    m.registerModule(new AfterburnerModule());
    m.registerModule(new FuzzyEnumModule());
    m.setPropertyNamingStrategy(new AnnotationSensitivePropertyNamingStrategy());
    m.setSubtypeResolver(new DiscoverableSubtypeResolver());

    //Setup object mapper to ignore the null properties when serializing the objects
    m.setSerializationInclusion(JsonInclude.Include.NON_NULL);
    //Lets be nice and allow additional properties by default.  Allows for more flexible forward/backward 
    //compatibility and works well with jackson addtional properties feature for serialization
    m.configure(FAIL_ON_UNKNOWN_PROPERTIES, false);

    this.classType = classType;
    this.mapper = m;
}

public static ObjectMapper objectMapper() {
    return new ObjectMapper()
            // Property visibility
            .setDefaultPropertyInclusion(JsonInclude.Include.ALWAYS)
            .setDefaultVisibility(JsonAutoDetect.Value.construct(PropertyAccessor.FIELD, JsonAutoDetect.Visibility.PROTECTED_AND_PUBLIC))
            .configure(MapperFeature.SORT_PROPERTIES_ALPHABETICALLY, true)
            .setSerializationInclusion(JsonInclude.Include.NON_NULL)
            .configure(SerializationFeature.WRITE_NULL_MAP_VALUES, true)

            // Property naming and order
            .setPropertyNamingStrategy(PropertyNamingStrategy.LOWER_CAMEL_CASE)

            // Customised de/serializers

            // Formats, locals, encoding, binary data
            .setDateFormat(new SimpleDateFormat("MM/dd/yyyy"))
            .setDefaultPrettyPrinter(new DefaultPrettyPrinter())
            .setLocale(Locale.CANADA);
}

/**
 * Convert an object to JSON byte array.
 *
 * @param object
 *            the object to convert
 * @return the JSON byte array
 * @throws IOException
 */
public static byte[] convertObjectToJsonBytes(Object object)
        throws IOException {
    ObjectMapper mapper = new ObjectMapper();
    mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);

    JavaTimeModule module = new JavaTimeModule();
    module.addSerializer(OffsetDateTime.class, JSR310DateTimeSerializer.INSTANCE);
    module.addSerializer(ZonedDateTime.class, JSR310DateTimeSerializer.INSTANCE);
    module.addSerializer(LocalDateTime.class, JSR310DateTimeSerializer.INSTANCE);
    module.addSerializer(Instant.class, JSR310DateTimeSerializer.INSTANCE);
    module.addDeserializer(LocalDate.class, JSR310LocalDateDeserializer.INSTANCE);
    mapper.registerModule(module);

    return mapper.writeValueAsBytes(object);
}

private JsonMapper() {
    // calls the default constructor
    super();

    // configures ISO8601 formatter for date without time zone
    // the used format is 'yyyy-MM-dd'
    setDateFormat(new SimpleDateFormat(FMT_ISO_LOCAL_DATE));

    // enforces to skip null and empty values in the serialized JSON output
    setSerializationInclusion(JsonInclude.Include.NON_EMPTY);

    // enforces to skip null references in the serialized output of map
    configure(SerializationFeature.WRITE_NULL_MAP_VALUES, false);

    // enables serialization failures, when mapper encounters unknown properties names
    configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);

    // configures the format to prevent writing of the serialized output for dates
    // instances as timestamps; any date should be written in ISO format
    configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
}

@Override
public void afterPropertiesSet() throws Exception
{
    //Configure the objectMapper ready for use
    objectMapper = new ObjectMapper();
    objectMapper.registerModule(module);
    objectMapper.setSerializationInclusion(JsonInclude.Include.NON_EMPTY);  //or NON_EMPTY?
    // this is deprecated in jackson 2.9 and there is no straight replacement
    // https://github.com/FasterXML/jackson-databind/issues/1547
    objectMapper.configure(SerializationFeature.WRITE_NULL_MAP_VALUES, false);
    objectMapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
    DateFormat DATE_FORMAT_ISO8601 = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZ");
    DATE_FORMAT_ISO8601.setTimeZone(TimeZone.getTimeZone("UTC"));
    objectMapper.setDateFormat(DATE_FORMAT_ISO8601);
    objectMapper.configure(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY, true);
}

public static ObjectMapper createObjectMapper() {
    final YAMLFactory yamlFactory = new YAMLFactory()
        .configure(YAMLGenerator.Feature.USE_NATIVE_TYPE_ID, false)
        .configure(YAMLGenerator.Feature.MINIMIZE_QUOTES, true)
        .configure(YAMLGenerator.Feature.ALWAYS_QUOTE_NUMBERS_AS_STRINGS, true)
        .configure(YAMLGenerator.Feature.USE_NATIVE_TYPE_ID, false);

    ObjectMapper mapper = new ObjectMapper(yamlFactory)
        .registerModule(new Jdk8Module())
        .setSerializationInclusion(JsonInclude.Include.NON_EMPTY)
        .enable(SerializationFeature.INDENT_OUTPUT)
        .disable(SerializationFeature.WRITE_NULL_MAP_VALUES);

    for (Step step : ServiceLoader.load(Step.class, YamlHelpers.class.getClassLoader())) {
        mapper.registerSubtypes(new NamedType(step.getClass(), step.getKind()));
    }

    return mapper;
}

private ObjectMapper createMapper(final boolean indent) {
//        final SimpleModule module = new SimpleModule();
//        module.addSerializer(Double.class, new MyDoubleSerialiser());

        final ObjectMapper mapper = new ObjectMapper();
//        mapper.registerModule(module);
        mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        mapper.configure(SerializationFeature.WRITE_NULL_MAP_VALUES, false);
        mapper.configure(SerializationFeature.INDENT_OUTPUT, indent);
        mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);

        // Enabling default typing adds type information where it would otherwise be ambiguous, i.e. for abstract classes
//        mapper.enableDefaultTyping();

        return mapper;
    }

public void parseExportedVariables(PrintStream logger, Run<?, ?> build, String output) throws IOException {

        if (exportVariablesString == null) {
            return;
        }
        if (exportVariablesString.trim().equals("")) {
            return;
        }
        logger.println("Transforming to environment variables: " + exportVariablesString);
        HashMap<String, String> exportVariablesNames = com.azure.azurecli.helpers.Utils.parseExportedVariables(exportVariablesString);
        HashMap<String, String> exportVariables = new HashMap<>();

        ObjectMapper mapper = new ObjectMapper();
        mapper.setSerializationInclusion(JsonInclude.Include.ALWAYS);

        JsonNode rootNode = mapper.readTree(output);
        for (Map.Entry<String, String> var
                :
                exportVariablesNames.entrySet()) {

            String value = rootNode.at(var.getKey()).asText();
            exportVariables.put(var.getValue(), value);
        }
        com.azure.azurecli.helpers.Utils.setEnvironmentVariables(build, exportVariables);
    }

/**
 * Initialize object mapper.
 *
 * @return the object mapper
 */
protected ObjectMapper initializeObjectMapper() {
    final ObjectMapper mapper = new ObjectMapper();
    mapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
    mapper.setSerializationInclusion(JsonInclude.Include.NON_EMPTY);
    mapper.setVisibility(PropertyAccessor.SETTER, JsonAutoDetect.Visibility.PROTECTED_AND_PUBLIC);
    mapper.setVisibility(PropertyAccessor.GETTER, JsonAutoDetect.Visibility.PROTECTED_AND_PUBLIC);
    mapper.setVisibility(PropertyAccessor.IS_GETTER, JsonAutoDetect.Visibility.PROTECTED_AND_PUBLIC);
    mapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL, JsonTypeInfo.As.PROPERTY);
    return mapper;
}

public JacksonContextResolver() throws Exception {
    this.objectMapper = new ObjectMapper()
        .registerModule(new Jdk8Module())
        .setSerializationInclusion(JsonInclude.Include.NON_ABSENT)
        .configure(DeserializationFeature.READ_ENUMS_USING_TO_STRING, true)
        .configure(SerializationFeature.WRITE_ENUMS_USING_TO_STRING, true);
}

public void createState(BrowserSessionId browserSessionId, String matchingId, long timeoutMillis, BrowserSessionStateExtractionConfig browserSessionStateExtractionConfig) {

            Map<String, Object>  params = ImmutableMap.of("optMatchingId", matchingId, "extractionConfig", browserSessionStateExtractionConfig);
            ObjectMapper mapper = new ObjectMapper();
            mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
            Optional<HttpResponse> r = sendPOST(createStateTemplate, ImmutableMap.of("browserSessionId", browserSessionId.toString()), mapper.valueToTree(params)).getOptHttpResponse();
            waitForStateExtractionResponse(timeoutMillis, r);
        }

@Primary
@Bean(name = "objectMapper")
ObjectMapper objectMapper() {
    springHateoasObjectMapper.configure(SerializationFeature.INDENT_OUTPUT, true);
    springHateoasObjectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
    springHateoasObjectMapper.setSerializationInclusion(JsonInclude.Include.NON_EMPTY);
    return springHateoasObjectMapper;
}

@Bean
@Primary
public Jackson2ObjectMapperBuilder objectMapperBuilder() {
    Jackson2ObjectMapperBuilder builder = new Jackson2ObjectMapperBuilder();
    builder.serializationInclusion(JsonInclude.Include.NON_NULL);
    return builder;
}

/**
 * Converts the POJO which represents the JSON payload into a JSON string.
 * null values will be ignored.
 */
public static String toJsonAsStringNonNull(Object object) throws IOException
{
    assertNotNull(object);
    ObjectMapper om = new ObjectMapper();
    om.setSerializationInclusion(JsonInclude.Include.NON_NULL);
    return om.writeValueAsString(object);
}

@Bean
public Jackson2ObjectMapperBuilder objectMapperBuilder() {
    Jackson2ObjectMapperBuilder builder = new Jackson2ObjectMapperBuilder();
    builder.serializationInclusion(JsonInclude.Include.NON_NULL);
    builder.indentOutput(true);
    return builder;
}

@Test
@SuppressWarnings({ "rawtypes", "unchecked" })
public void defaultAnnotationStyeIsJackson2() throws ClassNotFoundException, SecurityException, NoSuchMethodException {

    ClassLoader resultsClassLoader = schemaRule.generateAndCompile("/schema/properties/primitiveProperties.json", "com.example");

    Class generatedType = resultsClassLoader.loadClass("com.example.PrimitiveProperties");

    Method getter = generatedType.getMethod("getA");

    assertThat(generatedType.getAnnotation(JsonPropertyOrder.class), is(notNullValue()));
    assertThat(generatedType.getAnnotation(JsonInclude.class), is(notNullValue()));
    assertThat(getter.getAnnotation(JsonProperty.class), is(notNullValue()));
}

@JsonInclude(JsonInclude.Include.NON_NULL)
public Object getValues() {
    if (valuesRef != null) {
        return valuesRef;
    } else if (values != null) {
        return values;
    }
    return null;
}

@Test
@SuppressWarnings({ "rawtypes", "unchecked" })
public void Jackson2InclusionLevelNonAbsent() throws ClassNotFoundException, SecurityException, NoSuchMethodException {

    ClassLoader resultsClassLoader = schemaRule.generateAndCompile("/schema/properties/primitiveProperties.json", "com.example",
            config("annotationStyle", "jackson2", "inclusionLevel", "NON_ABSENT"));

    Class generatedType = resultsClassLoader.loadClass("com.example.PrimitiveProperties");

    assertThat(generatedType.getAnnotation(JsonInclude.class), is(notNullValue()));
    assertThat(((JsonInclude) generatedType.getAnnotation(JsonInclude.class)).value(), is(JsonInclude.Include.NON_ABSENT));
}

@Test
@SuppressWarnings({ "rawtypes", "unchecked" })
public void Jackson2InclusionLevelNonNull() throws ClassNotFoundException, SecurityException, NoSuchMethodException {

    ClassLoader resultsClassLoader = schemaRule.generateAndCompile("/schema/properties/primitiveProperties.json", "com.example",
            config("annotationStyle", "jackson2", "inclusionLevel", "NON_NULL"));

    Class generatedType = resultsClassLoader.loadClass("com.example.PrimitiveProperties");

    assertThat(generatedType.getAnnotation(JsonInclude.class), is(notNullValue()));
    assertThat(((JsonInclude) generatedType.getAnnotation(JsonInclude.class)).value(), is(JsonInclude.Include.NON_NULL));
}

@Test
@SuppressWarnings({ "rawtypes", "unchecked" })
public void Jackson2InclusionLevelUseDefault() throws ClassNotFoundException, SecurityException, NoSuchMethodException {

    ClassLoader resultsClassLoader = schemaRule.generateAndCompile("/schema/properties/primitiveProperties.json", "com.example",
            config("annotationStyle", "jackson2", "inclusionLevel", "USE_DEFAULTS"));

    Class generatedType = resultsClassLoader.loadClass("com.example.PrimitiveProperties");

    assertThat(generatedType.getAnnotation(JsonInclude.class), is(notNullValue()));
    assertThat(((JsonInclude) generatedType.getAnnotation(JsonInclude.class)).value(), is(JsonInclude.Include.USE_DEFAULTS));
}

/**
 * Convert an object to JSON byte array.
 *
 * @param object
 *            the object to convert
 * @return the JSON byte array
 * @throws IOException
 */
public static byte[] convertObjectToJsonBytes(Object object)
        throws IOException {
    ObjectMapper mapper = new ObjectMapper();
    mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);

    JavaTimeModule module = new JavaTimeModule();
    mapper.registerModule(module);

    return mapper.writeValueAsBytes(object);
}

/**
 * Convert an object to JSON byte array.
 *
 * @param object
 *            the object to convert
 * @return the JSON byte array
 * @throws IOException
 */
public static byte[] convertObjectToJsonBytes(Object object)
        throws IOException {
    ObjectMapper mapper = new ObjectMapper();
    mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);

    JavaTimeModule module = new JavaTimeModule();
    mapper.registerModule(module);

    return mapper.writeValueAsBytes(object);
}

/**
 * Convert an object to JSON byte array.
 *
 * @param object
 *            the object to convert
 * @return the JSON byte array
 * @throws IOException
 */
public static byte[] convertObjectToJsonBytes(Object object)
        throws IOException {
    ObjectMapper mapper = new ObjectMapper();
    mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);

    JavaTimeModule module = new JavaTimeModule();
    mapper.registerModule(module);

    return mapper.writeValueAsBytes(object);
}

private CustomizationObjectMapper (DateFormat dateFormat) {
    super();
    // 设置格式化
    setDateFormat( dateFormat );
    // <code>null<code> 不序列化
    setSerializationInclusion( JsonInclude.Include.NON_NULL );
}

/**
 * Convert an object to JSON byte array.
 *
 * @param object
 *            the object to convert
 * @return the JSON byte array
 * @throws IOException
 */
public static byte[] convertObjectToJsonBytes(Object object)
        throws IOException {
    ObjectMapper mapper = new ObjectMapper();
    mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);

    JavaTimeModule module = new JavaTimeModule();
    mapper.registerModule(module);

    return mapper.writeValueAsBytes(object);
}

private String getErrors(TransformException exception) throws JsonProcessingException {
    ObjectWriter jsonObjectWriter = new ObjectMapper()
            .setSerializationInclusion(JsonInclude.Include.NON_NULL)
            .writer()
            .withDefaultPrettyPrinter();
    return jsonObjectWriter.writeValueAsString(exception.getDetails());
}

/**
 * Write out the errors to a file.
 *
 * @param allErrors The errors to write.
 * @param outFile The location to write.
 */
private void writeOutErrors(AllErrors allErrors, Path outFile) {
    try (Writer writer = Files.newBufferedWriter(outFile)) {
        ObjectWriter jsonObjectWriter = new ObjectMapper()
                .setSerializationInclusion(JsonInclude.Include.NON_NULL)
                .writer()
                .withDefaultPrettyPrinter();
        jsonObjectWriter.writeValue(writer, allErrors);
    } catch (IOException exception) {
        DEV_LOG.error("Could not write out error JSON to file", exception);
    }
}

@Bean
@Primary
public ObjectMapper objectMapper() {
    return new ObjectMapper()
        .registerModule(new Jdk8Module())
        .registerModule(new ParameterNamesModule(JsonCreator.Mode.PROPERTIES))
        .registerModule(new JavaTimeModule()).disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS)
        .setSerializationInclusion(JsonInclude.Include.NON_EMPTY)
        .disable(SerializationFeature.FAIL_ON_EMPTY_BEANS);
}

/**
 * Initialize object mapper.
 *
 * @return the object mapper
 */
protected ObjectMapper initializeObjectMapper() {
    final ObjectMapper mapper = new ObjectMapper();
    mapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
    mapper.setSerializationInclusion(JsonInclude.Include.NON_EMPTY);
    mapper.setVisibility(PropertyAccessor.SETTER, JsonAutoDetect.Visibility.PROTECTED_AND_PUBLIC);
    mapper.setVisibility(PropertyAccessor.GETTER, JsonAutoDetect.Visibility.PROTECTED_AND_PUBLIC);
    mapper.setVisibility(PropertyAccessor.IS_GETTER, JsonAutoDetect.Visibility.PROTECTED_AND_PUBLIC);
    mapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL, JsonTypeInfo.As.PROPERTY);
    return mapper;
}

@JsonInclude(JsonInclude.Include.NON_DEFAULT)
public List<String> getExtensions() {
  if (extensions == null) {
    // when loading an old JSONFormatConfig that doesn't contain an "extensions" attribute
    return DEFAULT_EXTS;
  }
  return extensions;
}

/**
 * Initialize object mapper.
 *
 * @return the object mapper
 */
protected ObjectMapper initializeObjectMapper() {
    final ObjectMapper mapper = new ObjectMapper();
    mapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
    mapper.setSerializationInclusion(JsonInclude.Include.NON_EMPTY);
    mapper.setVisibility(PropertyAccessor.SETTER, JsonAutoDetect.Visibility.PROTECTED_AND_PUBLIC);
    mapper.setVisibility(PropertyAccessor.GETTER, JsonAutoDetect.Visibility.PROTECTED_AND_PUBLIC);
    mapper.setVisibility(PropertyAccessor.IS_GETTER, JsonAutoDetect.Visibility.PROTECTED_AND_PUBLIC);
    mapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL, JsonTypeInfo.As.PROPERTY);
    return mapper;
}

@Bean
public Jackson2ObjectMapperBuilder objectMapperBuilder() {
    return new Jackson2ObjectMapperBuilder()
            .failOnUnknownProperties(false)
            .indentOutput(true)
            .serializationInclusion(JsonInclude.Include.NON_NULL)
            .modulesToInstall(
                    new Jdk8Module(),
                    new JavaTimeModule()
            );
}

private static MappingJackson2JsonView createDelegatedView() {
    final MappingJackson2JsonView view = new MappingJackson2JsonView();
    view.setPrettyPrint(true);
    view.setDisableCaching(true);
    view.getObjectMapper().setSerializationInclusion(JsonInclude.Include.NON_NULL).findAndRegisterModules();
    return view;
}

/**
 * Convert an object to JSON byte array.
 *
 * @param object
 *            the object to convert
 * @return the JSON byte array
 * @throws IOException
 */
public static byte[] convertObjectToJsonBytes(Object object)
        throws IOException {
    ObjectMapper mapper = new ObjectMapper();
    mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);

    JavaTimeModule module = new JavaTimeModule();
    mapper.registerModule(module);

    return mapper.writeValueAsBytes(object);
}

/**
 * Convert an object to JSON byte array.
 *
 * @param object
 *            the object to convert
 * @return the JSON byte array
 * @throws IOException
 */
public static byte[] convertObjectToJsonBytes(Object object)
        throws IOException {
    ObjectMapper mapper = new ObjectMapper();
    mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);

    JavaTimeModule module = new JavaTimeModule();
    mapper.registerModule(module);

    return mapper.writeValueAsBytes(object);
}