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

You need to use `jackson-module-kotlin` to deserialize to data classes. See [here][1] 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.

[1]:

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Just want to point out that this [answer](

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) 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`

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

@AllArgsConstructor
@NoArgsConstructor
@Getter
@ToString
@EqualsAndHashCode
public class User {
private Long userId;
private String shortName;
}

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


@Configuration
open class JacksonMapper {

@Bean
open fun mapper(): ObjectMapper {
val mapper = ObjectMapper()
...

mapper.registerModule(KotlinModule())
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
```java
//compileJava.options.compilerArgs = ['-Xlint:unchecked','-Xlint:deprecation']
```

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

lombok.anyconstructor.addconstructorproperties=true

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

I got the same error and the problem was that my *model* didn't implement ***Serializable***, so check this as well, might help since this is also **one of the reason**.

Add Constructor in class
OR
if you are using pojo add
@NoArgsConstructor
@AllArgsConstructor


Also include JsonProperty -
`@JsonProperty("name")
private List<Employee> name;`

Just need to add ```@NoArgsConstructor``` and it works.