java/jackson - don't serialize wrapping class

java/jackson - don't serialize wrapping class

By : Li Wu
Date : November 15 2020, 06:54 AM
Hope that helps When serializing a list of string with Jackson library, it provides correctly a JSON array of strings: , You can use @JsonValue on your single getter
code :
public String getS() {
    return s;

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JAXB dont want wrapping class

JAXB dont want wrapping class

By : user76056
Date : March 29 2020, 07:55 AM
this one helps. You could use a StAX (JSR-173) XMLStreamReader to parse the XML document (an implementation is included in the JDK/JRE since Java SE 6). Then you could advance it to advance to each watermark element and then have JAXB (JSR-222) unmarshal that.
code :
import javax.xml.bind.*;
import javax.xml.stream.*;
import javax.xml.transform.stream.StreamSource;

public class Demo {

    public static void main(String[] args) throws Exception {
        JAXBContext jc = JAXBContext.newInstance(Watermark.class);
        Unmarshaller unmarshaller = jc.createUnmarshaller();

        StreamSource source = new StreamSource("input.xml");
        XMLInputFactory xif = XMLInputFactory.newFactory();
        XMLStreamReader xsr = xif.createXMLStreamReader(source);
        xsr.nextTag(); // Advance to "watermarks" element
        xsr.nextTag(); // Advance to "watermark" element

        while(xsr.getLocalName().equals("watermark")) {
             Watermark object = (Watermark) unmarshaller.unmarshal(xsr);

How to serialize with Jackson a java.util.Map based class

How to serialize with Jackson a java.util.Map based class

By : user2059828
Date : March 29 2020, 07:55 AM
Hope that helps Most probably you will end up with implementing your own serializer which will handle your custom Map type. Please refer to this question for more information.
If you choose to replace inheritance with composition, that is to make your class to include a map field not to extend a map, then it is pretty easy to solve this using the @JsonAnyGetter annotation.
code :
public class JacksonMap {

    public static class Bean {
        private final String field;
        private final Map<String, Object> map;

        public Bean(String field, Map<String, Object> map) {
            this.field = field;
            this.map = map;

        public String getField() {
            return field;

        public Map<String, Object> getMap() {
            return map;

    public static void main(String[] args) throws JsonProcessingException {
        Bean map = new Bean("value1", Collections.<String, Object>singletonMap("key1", "value2"));
        ObjectMapper mapper = new ObjectMapper();
JAVA JACKSON: serialize a class with two field instead of all class

JAVA JACKSON: serialize a class with two field instead of all class

By : DonDel
Date : March 29 2020, 07:55 AM
To fix this issue Solved adding a Json Serializer.
I have created an NationJsonSerializer for the parent class:
code :
public class NationJsonSerializer extends JsonSerializer<TNation> {

public void serialize(TNation value, JsonGenerator jgen, SerializerProvider provider) 
  throws IOException, JsonProcessingException {
    jgen.writeNumberField("id", value.getId());
    jgen.writeStringField("name", value.getComune());
    jgen.writeStringField("iso", value.getCap());
@JoinColumn(name = "idtnation",referencedColumnName = "id",nullable = true)
@ManyToOne(targetEntity = TNation.class, fetch = FetchType.EAGER)
@JsonSerialize(using = NationJsonSerializer.class)
private TNation nation;
Derive the exact class from the wrapping class Jackson

Derive the exact class from the wrapping class Jackson

By : Cptl
Date : March 29 2020, 07:55 AM
To fix the issue you can do Here is the solution for my problem, however the JsonTypeInfo.As.EXTERNAL_PROPERTY is since 1.9 version :(
Jackson JsonTypeInfo.As.EXTERNAL_PROPERTY doesn't work as expected
Java Jackson Serialize List of Abstract Class

Java Jackson Serialize List of Abstract Class

By : Georgina Gonzalez
Date : March 29 2020, 07:55 AM
To fix the issue you can do Scenario , I've found after a few days a solution:
code :
public static <T> Optional<String> toJson(final ObjectMapper mapper, final TypeReference<T> type, final T object) {
    try {
        return Optional.ofNullable(mapper.writer().forType(type).writeValueAsString(object));
    } catch (JsonProcessingException e) {
        return Optional.empty();

public static void main(String[] args) {
    List<InfoItem> items = new ArrayList<>();
    // Set values in items...

    ObjectMapper mapper = new ObjectMapper();
    Optional<String> json = toJson(mapper, new TypeReference<List<InfoItem>>() {}, items);
    json.ifPresent(x -> System.out.println(x));
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