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java/jackson - chained @JsonValue annotations and deserialization


java/jackson - chained @JsonValue annotations and deserialization

By : Jake Yap
Date : November 17 2020, 11:55 AM
will help you @JsonValue is for serializing. The analogous annotation for deserializing is @JsonCreator.
Annotate your constructors
code :
@JsonCreator
public StringWrapper(final String s) {
    this.s = s;
}
@JsonCreator
public StringWrapperOuter(final StringWrapper s) {
    this.s = s;
}


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Jackson polymorphic deserialization using annotations

Jackson polymorphic deserialization using annotations


By : hossein
Date : March 29 2020, 07:55 AM
I hope this helps . You can annotate the animal field in Zoo with JsonTypeInfo to specify which subtype you want Dog or Cat per the animalType field also in Zoo. The tricky bit is to specify that the specific type of Animal will come from a property outside of Animal in the JSON i.e. an EXTERNAL_PROPERTY
code :
@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.EXTERNAL_PROPERTY, property = "animalType")
@JsonSubTypes({
        @JsonSubTypes.Type(value = Cat.class, name = "cat"),
        @JsonSubTypes.Type(value = Dog.class, name = "dog")
})
private Animal animal;
How to ignore certain fields for deserialization without jackson annotations?

How to ignore certain fields for deserialization without jackson annotations?


By : DavCopp
Date : March 29 2020, 07:55 AM
Any of those help I have a class inside a spring framework project. The class must not be annotated with jackson. But, it is annotated with @Component i.e. org.springframework.stereotype.Component. , You have two options.
Use @JsonIgnore on getter or field
code :
class Sample {
    private String prop1;
    private String prop2;
    @JsonIgnore // could be here
    private String prop3;

    @JsonIgnore // could be here
    public String getProp3() {
        return prop3;
    }
}
new ObjectMapper().writeValueAsString(new Sample("one", "two", "three"))
class SampleSerializer extends JsonSerializer<Sample> {

    @Override
    public void serialize(Sample sample, JsonGenerator jgen, SerializerProvider provider) throws IOException {
        jgen.writeStartObject();
        jgen.writeStringField("prop1", sample.getProp1());
        jgen.writeStringField("prop2", sample.getProp2());
        jgen.writeEndObject();
    }
}
@JsonSerialize(using = SampleSerializer.class)
class Sample {

    private String prop1;
    private String prop2;
    private String prop3;
}
new ObjectMapper().writeValueAsString(new Sample("one", "two", "three"))
class Sample {

    private String prop1;
    private String prop2;
    private String prop3;
}
ObjectMapper mapper = new ObjectMapper();

SimpleModule module = new SimpleModule();
module.addSerializer(Sample.class, new SampleSerializer());
mapper.registerModule(module);

mapper.writeValueAsString(new Sample("one", "two", "three"));
Java - Deserialization Annotations with fasterXML and Jackson

Java - Deserialization Annotations with fasterXML and Jackson


By : Bhumika Patel
Date : March 29 2020, 07:55 AM
this one helps. Here's a simple example of working code to deserialize a string list using fasterXML/Jackson in the constructor: , You can write a custom deserializer:
code :
public static class XyzDeserializer extends JsonDeserializer<Map<Integer, String>> {

    @Override
    public Map<Integer, String> deserialize(JsonParser p,
                                            DeserializationContext ctxt) throws IOException {
        JsonNode rootNode = p.getCodec().readTree(p);
        Map<Integer, String> map = new HashMap<>();
        rootNode.forEach(n -> map.put(
                n.get("fooId").intValue(),
                n.get("barVal").asText()
        ));
        return map;
    }
}
@JsonCreator
public FooBar(
        @JsonProperty("blargs")
        @JsonDeserialize(using = XyzDeserializer.class) Map<Integer, String> xyz) {
    this.xyz = xyz;
}
Support deserialization of inheritance chained objects in kotlin with jackson

Support deserialization of inheritance chained objects in kotlin with jackson


By : Kunal Roy
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further The issue happens because annotation over constructor field is not applied to field nor getter automatically (kotlin mechanizm). Also Seems that it is not processed on deserialization of a child object.
Jackson supports annotations over field or over getter methods, so an appropriate solutions are either
code :
open class Parent(
    @get:JsonProperty("parent_value")
    val parentValue: String = "default"
)
open class Parent(
    @field:JsonProperty("parent_value")
    val parentValue: String = "default"
)
Polymorphic deserialization in Jackson without annotations

Polymorphic deserialization in Jackson without annotations


By : Ethan
Date : March 29 2020, 07:55 AM
I wish this helpful for you You can still rely on annotations even if you cannot modify your class. Jackson supports a feature called mix-ins: you can think of it as kind of aspect-oriented way of adding more annotations during runtime, to augment statically defined ones.
First define an interface as follows:
code :
public interface CloudEventMixIn<T> {

     @JsonTypeInfo(
            use = JsonTypeInfo.Id.NAME,
            include = JsonTypeInfo.As.EXTERNAL_PROPERTY,
            property = "eventType",
            defaultImpl = Void.class)
    @JsonSubTypes({
            @JsonSubTypes.Type(value = MyEvent1.class, name = "event-1"),
            @JsonSubTypes.Type(value = MyEvent2.class, name = "event-2")
    })
    public T getData();
}
ObjectMapper mapper = new ObjectMapper();
mapper.addMixIn(CloudEvent.class, CloudEventMixIn.class);
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