Example usage for com.fasterxml.jackson.databind ObjectMapper writerWithType

List of usage examples for com.fasterxml.jackson.databind ObjectMapper writerWithType


In this page you can find the example usage for com.fasterxml.jackson.databind ObjectMapper writerWithType.


public ObjectWriter writerWithType(JavaType rootType) 

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Factory method for constructing ObjectWriter that will serialize objects using specified root type, instead of actual runtime type of value.


From source file:org.mashti.jetson.util.JsonGeneratorUtil.java

 * Writes the given {@code values} as a JSON array with the given field name and serialises each value as a provided type.
 * An {@link ObjectMapper} must be present as the {@code generator}'s {@link JsonGenerator#getCodec() codec}.
 * For each value in the given {@code values}, a type must be provided under the same index in {@code value_types}.
 * This method supports parameterised types.
 * @param generator the JSON generator/*  w  ww. j a v  a  2s  .  com*/
 * @param field_name the field name of the JSON array
 * @param value_types the types of the values
 * @param values the values
 * @throws IOException Signals that an I/O exception has occurred.
public static void writeValuesAs(final JsonGenerator generator, final String field_name,
        final Type[] value_types, final Object[] values) throws IOException {

    if (values != null && values.length > 0) {
        final ObjectMapper mapper = (ObjectMapper) generator.getCodec();
        int i = 0;
        for (final Object value : values) {
            final Type value_type = value_types[i++];
            final ObjectWriter writer = mapper.writerWithType(JsonParserUtil.toTypeReference(value_type));
            writer.writeValue(generator, value);

From source file:org.n52.web.BaseController.java

private void writeExceptionResponse(WebException e, HttpServletResponse response, HttpStatus status) {

    if (status == INTERNAL_SERVER_ERROR) {
        LOGGER.error("An exception occured.", e);
    } else {//from  w ww . j a va2 s  .co  m
        LOGGER.debug("An exception occured.", e);

    // TODO consider using a 'suppress_response_codes=true' parameter and always return 200 OK

    ObjectMapper objectMapper = createObjectMapper();
    ObjectWriter writer = objectMapper.writerWithType(ExceptionResponse.class);
    ExceptionResponse exceptionResponse = createExceptionResponse(e, status);
    try {
        writer.writeValue(response.getOutputStream(), exceptionResponse);
    } catch (IOException ioe) {
        LOGGER.error("Could not process error message.", e);

From source file:com.feedzai.fos.api.CategoricalAttributeTest.java

public void testJackson() throws Exception {
    List<Attribute> attributes = new ArrayList<>();
    attributes.add(field);//from   w  ww . j  av  a  2  s  .c o  m

    ObjectMapper mapper = new ObjectMapper();
    TypeReference<List<Attribute>> typeReference = new TypeReference<List<Attribute>>() {
    String result = mapper.writerWithType(typeReference).writeValueAsString(attributes);
    List<Attribute> deserialized = mapper.readValue(result, typeReference);
    assertEquals(attributes.size(), deserialized.size());
    CategoricalAttribute extracted = (CategoricalAttribute) deserialized.get(0);
    assertEquals(field.getName(), extracted.getName());
    assertEquals(field.getCategoricalInstances(), extracted.getCategoricalInstances());

From source file:test.com.wealdtech.jackson.modules.WIDModuleTest.java

public void testObjectMap() {
    final ObjectMapper mapper = WealdMapper.getMapper().copy().enableDefaultTyping();

    final Map<String, Object> map = Maps.newHashMap();
    map.put("test1", new Date());
    map.put("test2", new InetSocketAddress(10));

    try {//  w  w  w  .  j  ava 2 s.  c om
        final String ser = mapper.writerWithType(Map.class).writeValueAsString(map);
        final Map<String, Object> deser = this.mapper.readValue(ser, new TypeReference<Map<String, Object>>() {
        assertTrue(deser.get("test1") instanceof Date);
        assertTrue(deser.get("test2") instanceof InetSocketAddress);
    } catch (final IOException e) {
        fail("Failed", e);

From source file:com.proofpoint.http.client.SmileBodyGenerator.java

public static <T> SmileBodyGenerator<T> smileBodyGenerator(JsonCodec<T> jsonCodec, T instance) {
    ObjectMapper objectMapper = OBJECT_MAPPER_SUPPLIER.get();
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    JsonGenerator jsonGenerator;// w  w  w.  j a va  2 s .  com
    try {
        jsonGenerator = new SmileFactory().createGenerator(out);
    } catch (IOException e) {
        throw propagate(e);

    Type genericType = jsonCodec.getType();
    // 04-Mar-2010, tatu: How about type we were given? (if any)
    JavaType rootType = null;
    if (genericType != null && instance != null) {
        // 10-Jan-2011, tatu: as per [JACKSON-456], it's not safe to just force root
        // type since it prevents polymorphic type serialization. Since we really
        // just need this for generics, let's only use generic type if it's truly
        // generic.
        if (genericType.getClass() != Class.class) { // generic types are other implementations of 'java.lang.reflect.Type'
            // This is still not exactly right; should root type be further
            // specialized with 'value.getClass()'? Let's see how well this works before
            // trying to come up with more complete solution.
            rootType = objectMapper.getTypeFactory().constructType(genericType);
            // 26-Feb-2011, tatu: To help with [JACKSON-518], we better recognize cases where
            // type degenerates back into "Object.class" (as is the case with plain TypeVariable,
            // for example), and not use that.
            if (rootType.getRawClass() == Object.class) {
                rootType = null;

    try {
        if (rootType != null) {
            objectMapper.writerWithType(rootType).writeValue(jsonGenerator, instance);
        } else {
            objectMapper.writeValue(jsonGenerator, instance);
    } catch (IOException e) {
        throw new IllegalArgumentException(
                String.format("%s could not be converted to SMILE", instance.getClass().getName()), e);

    return new SmileBodyGenerator<>(out.toByteArray());