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Using the instantiated collection type for Jackson deserialization instead of initializing a new one?


Using the instantiated collection type for Jackson deserialization instead of initializing a new one?

By : Leen
Date : December 01 2020, 04:50 PM
Hope this helps Found an answer using @JsonProperty:
code :
@JsonProperty
private void setValues(Set<Types> types) {
    values.addAll(types);
}


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Deserialization issues with Joda Time / Jackson 2 / Spring - Can not instantiate value of type [simple type, class org.j

Deserialization issues with Joda Time / Jackson 2 / Spring - Can not instantiate value of type [simple type, class org.j


By : Srinivas Vasudevan
Date : March 29 2020, 07:55 AM
will help you I believe my issue was simply that I was running different versions of the jackson joda component to everything else.
In the end I did this in my Gradle file
code :
String jacksonCore = 'com.fasterxml.jackson.core:jackson-core:'
String jacksonAnnotations = 'com.fasterxml.jackson.core:jackson-annotations:'
String jacksonDatabind = 'com.fasterxml.jackson.core:jackson-databind:'
String jacksonJoda='com.fasterxml.jackson.datatype:jackson-datatype-joda:'
String jacksonVersion = '2.4.1'


dependencies {

    compile jacksonCore + jacksonVersion
    compile jacksonAnnotations + jacksonVersion
    compile jacksonDatabind + jacksonVersion
    compile jacksonJoda + jacksonVersion
Jackson 2.6.3 Deserialization avoid literal null added to collection

Jackson 2.6.3 Deserialization avoid literal null added to collection


By : lalit agrawal
Date : March 29 2020, 07:55 AM
will help you I got an inspiration from the following post
Jackson: Ignore whitespace in empty @XmlWrapperElement collection
code :
public class NullCollectionHandler extends SimpleModule {
    private static class CustomizedCollectionDeserialiser extends CollectionDeserializer {

        public CustomizedCollectionDeserialiser(CollectionDeserializer src) {
            super(src);
        }

        private static final long serialVersionUID = 1L;

        @Override
        public Collection<Object> deserialize(JsonParser jp, DeserializationContext ctxt)
                throws IOException, JsonProcessingException {
            Collection<Object> oldCol = super.deserialize(jp, ctxt);
            Collection<Object> newCol = new ArrayList<Object>();
            if(CollectionUtils.isNotEmpty(oldCol)){
                for(Object obj : oldCol){
                    if(obj != null)
                    newCol.add(obj);
                }
            }
            return newCol;
        }

        @Override
        public CollectionDeserializer createContextual(DeserializationContext ctxt,
                BeanProperty property) throws JsonMappingException {
            return new CustomizedCollectionDeserialiser(super.createContextual(ctxt, property));
        }
    }

    private static final long serialVersionUID = 1L;

    @Override
    public void setupModule(SetupContext context) {
        super.setupModule(context);
        context.addBeanDeserializerModifier(new BeanDeserializerModifier() {
            @Override
            public JsonDeserializer<?> modifyCollectionDeserializer(
                    DeserializationConfig config, CollectionType type,
                    BeanDescription beanDesc, JsonDeserializer<?> deserializer) {
                if (deserializer instanceof CollectionDeserializer) {
                    return new CustomizedCollectionDeserialiser(
                        (CollectionDeserializer) deserializer);
                } else {
                    return super.modifyCollectionDeserializer(config, type, beanDesc,
                        deserializer);
                }
            }
        });
    }
}
C# JSON Deserialization : Type is an interface or abstract class and cannot be instantiated

C# JSON Deserialization : Type is an interface or abstract class and cannot be instantiated


By : IBmeister
Date : March 29 2020, 07:55 AM
I wish did fix the issue. This is what i have done to get it working. to Chris from Guru.com for getting this working. Great guy and very well priced. You can find him here: http://www.guru.com/freelancers/deatc
code :
private IDictionary<string, IBalance> GetBalances()
{
    var postData = new Dictionary<string, object>();
    var data = PostData<IDictionary<string, Balance>>("returnCompleteBalances", postData);
    var returnData = new Dictionary<string, IBalance>();

    foreach (string key in data.Keys)
    {
        returnData.Add(key, data[key]);
    }

    return returnData;
}
Jackson Deserialization with no Type

Jackson Deserialization with no Type


By : user3497640
Date : March 29 2020, 07:55 AM
it should still fix some issue I would write a custom deserializer which takes it as a generic JSONObject or the like. Then I'd check if a differentiating key exists. For example:
code :
// pseudocode
when (json: JSONObject) {
    hasKey("responseCode") -> // deserialize as MyDataClass
    hasKey("errorCode") -> // deserialize as MyOtherDataClass
}
Jackson: deserialization to a collection

Jackson: deserialization to a collection


By : Xuân Khoái Nguyễn
Date : March 29 2020, 07:55 AM
I hope this helps you . I am not sure why are trying to explicitly specify deserializers, as it would all work just fine with something like:
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