com.fasterxml.jackson.module.kotlin.MissingKotlinParameterException

[pravee1801]

Does Jackson support deserializing missing keys in the json? Currently we have a data class where a member is non nullable and the same is not present in the json; for which jackson throws com.fasterxml.jackson.module.kotlin.MissingKotlinParameterException . But I dont want jackson to assign any value if a particular key is missing in the json file, just deserialize the fields present in the json. Is there any configuration that I have missed here?

Additionaly have already configured jackson with this.map.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);

[cowtowncoder]

By "missing" I guess you mean "unknown" (or unrecognized)?

It would make sense to add an example here, because behavior can be different between different target types: JsonNode and Map has no concept of unknown keys whereas plain Java/Kotlin objects do have concept (no matching Object property for given JSON Object name).
Further, structure of Object definition matters: Kotlin module has more constraints when properties are passed via constructor than when set using setter methods, or assigned to fields.

This is why a reproduction (or example) is needed, not general verbal description.

[pravee1801]

Consider my Dataclass is
class Abc{
public final val x : kotlin.String
public final val y : kotlin.String
public final val z : kotlin.collections.List[class A]
}
where class A{
public final val L : kotlin.String
public final val K : kotlin.String
public final val J : kotlin.String
}
in this case all the members are non nullable. But in my json I dont have set value for Variable K. For which Jackson is throwing com.fasterxml.jackson.module.kotlin.MissingKotlinParameterException: Instantiation of [simple type, class A] value failed for JSON property K due to missing (therefore NULL) value for creator parameter K which is a non-nullable type
What I want in this case is Jackson to only deserialize the available Json keys and ignore if the parameters are not available without throwing exception
@cowtowncoder

[pravee1801]

list of class A got hidden.