[android] No Creators, like default construct, exist): cannot deserialize from Object value (no delegate- or property-based Creator

I am trying to consume an API using Retrofit and Jackson to deserialize. I am getting the onFailure error No Creators, like default construct, exist): cannot deserialize from Object value (no delegate- or property-based Creator.

This question is related to android kotlin jackson retrofit2

The answer is

I had this issue and i fixed with the code below.

open class JacksonMapper {

    open fun mapper(): ObjectMapper {
        val mapper = ObjectMapper()

        return mapper

My cause of issue seems very uncommon to me, not sure if anybody else gets the error under same condition, I found the cause by diffing previous commits, here you go :

Via my build.gradle I was using these 2 compiler options, and commenting out this line fixed the issue

//compileJava.options.compilerArgs = ['-Xlint:unchecked','-Xlint:deprecation']

Encountered the same error in below Usecase.

I tried to hit the Rest(Put mapping) end point using sprint boot(2.0.0 Snapshot Version) without having default constructor in respective bean.

But with latest Spring Boot versions(2.4.1 Version) the same piece of code is working without error.

so the bean default constructor is no longer needed in latest version of Spring Boot

If you are using LOMBOK. Create a file lombok.config if you don't have one and add this line.


I solved this issue by adding a no argument constractor. If you are using Lombok, you only need to add @NoArgsConstructor annotation:

public class User {
    private Long userId;
    private String shortName;

I could resolve this problem in Kotlin with help of @JacksonProperty annotation. Usage example for above case would be:

import com.fasterxml.jackson.annotation.JsonProperty
data class Station(
     @JacksonProperty("repsol_id") val repsol_id: String,
     @JacksonProperty("name") val name: String,

I got here searching for this error:

No Creators, like default construct, exist): cannot deserialize from Object value (no delegate- or property-based Creator

Nothing to do with Retrofit but if you are using Jackson this error got solved by adding a default constructor to the class throwing the error. More here: https://www.baeldung.com/jackson-exception

I'm using rescu with Kotlin and resolved it by using @ConstructorProperties

    data class MyResponse @ConstructorProperties("message", "count") constructor(
        val message: String,
        val count: Int

Jackson uses @ConstructorProperties. This should fix Lombok @Data as well.

When you are using Lombok builder you will get the above error.

 @JsonDeserialize(builder = StationResponse.StationResponseBuilder.class)
 public class StationResponse{
   //define required properties 

 @JsonIgnoreProperties(ignoreUnknown = true)
 @JsonPOJOBuilder(withPrefix = "")
 public static class StationResponseBuilder {}

Reference : https://projectlombok.org/features/Builder With Jackson

You need to use jackson-module-kotlin to deserialize to data classes. See here for details.

The error message above is what Jackson gives you if you try to deserialize some value into a data class when that module isn't enabled or, even if it is, when the ObjectMapper it uses doesn't have the KotlinModule registered. For example, take this code:

data class TestDataClass (val foo: String)

val jsonString = """{ "foo": "bar" }"""
val deserializedValue = ObjectMapper().readerFor(TestDataClass::class.java).readValue<TestDataClass>(jsonString)

This will fail with the following error:

com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot construct instance of `test.SerializationTests$TestDataClass` (although at least one Creator exists): cannot deserialize from Object value (no delegate- or property-based Creator)

If you change the code above and replace ObjectMapper with jacksonObjectMapper (which simply returns a normal ObjectMapper with the KotlinModule registered), it works. i.e.

val deserializedValue = jacksonObjectMapper().readerFor(TestDataClass::class.java).readValue<TestDataClass>(jsonString)

I'm not sure about the Android side of things, but it looks like you'll need to get the system to use the jacksonObjectMapper to do the deserialization.

Extending Yoni Gibbs's answer, if you are in an android project using retrofit and configure serialization with Jackson you can do these things in order to deserialization works as expected with kotlin's data class.

In your build gradle import:

implementation "com.fasterxml.jackson.module:jackson-module-kotlin:2.11.+"

Then, your implementation of retrofit:

val serverURL = "http://localhost:8080/api/v1"

val objectMapper = ObjectMapper()
//Only if you are using Java 8's Time API too, require jackson-datatype-jsr310

           .readTimeout(1, TimeUnit.MINUTES)//No mandatory
            .connectTimeout(1, TimeUnit.MINUTES)//No mandatory
            .addInterceptor(UnauthorizedHandler())//No mandatory

Data class:

@JsonIgnoreProperties(ignoreUnknown = true)
data class Task(val id: Int,
                val name: String,
                @JsonSerialize(using = LocalDateTimeSerializer::class)
                @JsonDeserialize(using = LocalDateTimeDeserializer::class)
                val specificDate: LocalDateTime?,
                var completed: Boolean,
                val archived: Boolean,
                val taskListId: UUID?

Just want to point out that this answer provides a better explanation.
Basically you can either have @Getter and @NoArgConstructor together
or let Lombok regenerates @ConstructorProperties using lombok.config file,
or compile your java project with -parameters flags,
or let Jackson use Lombok's @Builder

If you are using Unirest as the http library, using the GsonObjectMapper instead of the JacksonObjectMapper will also work.

<!-- https://mvnrepository.com/artifact/com.konghq/unirest-object-mappers-gson -->
Unirest.config().objectMapper = GsonObjectMapper()

As the error mentioned the class does not have a default constructor.

Adding @NoArgsConstructor to the entity class should fix it.

If you're using Lombok on a POJO model, make sure you have these annotations:


It could vary, but make sure @Getter and especially @NoArgsConstructor.

I know this is an old post, but for anyone using Retrofit, this can be useful useful.

If you are using Retrofit + Jackson + Kotlin + Data classes, you need:

  1. add implement group: 'com.fasterxml.jackson.module', name: 'jackson-module-kotlin', version: '2.7.1-2' to your dependencies, so that Jackson can de-serialize into Data classes
  2. When building retrofit, pass the Kotlin Jackson Mapper, so that Retrofit uses the correct mapper, ex:
    val jsonMapper = com.fasterxml.jackson.module.kotlin.jacksonObjectMapper()

    val retrofit = Retrofit.Builder()

Note: If Retrofit is not being used, @Jayson Minard has a more general approach answer.

I had a similar issue (using Jackson, lombok, gradle) and a POJO without no args constructor - the solution was to add


to the lombok.config file

Examples related to android

Under what circumstances can I call findViewById with an Options Menu / Action Bar item? How to implement a simple scenario the OO way My eclipse won't open, i download the bundle pack it keeps saying error log getting " (1) no such column: _id10 " error java doesn't run if structure inside of onclick listener Cannot retrieve string(s) from preferences (settings) strange error in my Animation Drawable how to put image in a bundle and pass it to another activity FragmentActivity to Fragment A failure occurred while executing com.android.build.gradle.internal.tasks

Examples related to kotlin

No Creators, like default construct, exist): cannot deserialize from Object value (no delegate- or property-based Creator How to allow all Network connection types HTTP and HTTPS in Android (9) Pie? Deprecated Gradle features were used in this build, making it incompatible with Gradle 5.0 Default interface methods are only supported starting with Android N Error : Program type already present: android.support.design.widget.CoordinatorLayout$Behavior Cannot inline bytecode built with JVM target 1.8 into bytecode that is being built with JVM target 1.6 startForeground fail after upgrade to Android 8.1 How to get current local date and time in Kotlin How to add an item to an ArrayList in Kotlin? HTTP Request in Kotlin

Examples related to jackson

No Creators, like default construct, exist): cannot deserialize from Object value (no delegate- or property-based Creator JSON parse error: Can not construct instance of java.time.LocalDate: no String-argument constructor/factory method to deserialize from String value How to convert JSON string into List of Java object? Deserialize Java 8 LocalDateTime with JacksonMapper java.lang.IllegalArgumentException: No converter found for return value of type java.lang.ClassNotFoundException: com.fasterxml.jackson.annotation.JsonInclude$Value How to modify JsonNode in Java? Deserialize JSON with Jackson into Polymorphic Types - A Complete Example is giving me a compile error Convert Map to JSON using Jackson Required request body content is missing: org.springframework.web.method.HandlerMethod$HandlerMethodParameter

Examples related to retrofit2

No Creators, like default construct, exist): cannot deserialize from Object value (no delegate- or property-based Creator Retrofit 2: Get JSON from Response body How to Upload Image file in Retrofit 2 Retrofit 2 - URL Query Parameter POST Multipart Form Data using Retrofit 2.0 including image Retrofit 2.0 how to get deserialised error response.body Logging with Retrofit 2 How to log request and response body with Retrofit-Android?