CognitoUserPoolVerifyAuthChallengeResponseEvent.Request`challengeAnswer` property is of incorrect type

[sdaletalentful]

The challengeAnswer property is defined as a Map<String, String> (source).

However, the AWS documentation here states that challengeAnswer will be a string.

Using the CognitoUserPoolVerifyAuthChallengeResponseEvent class as-is results in Jackson serialization errors. For instance:

An error occurred during JSON parsing: java.lang.RuntimeException
java.lang.RuntimeException: An error occurred during JSON parsing
Caused by: java.io.UncheckedIOException: com.amazonaws.lambda.thirdparty.com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot construct instance of `java.util.LinkedHashMap` (although at least one Creator exists): no String-argument constructor/factory method to deserialize from String value ('1234')
 at [Source: (ByteArrayInputStream); line: 1, column: 642] (through reference chain: com.amazonaws.services.lambda.runtime.events.CognitoUserPoolVerifyAuthChallengeResponseEvent["request"]->com.amazonaws.services.lambda.runtime.events.CognitoUserPoolVerifyAuthChallengeResponseEvent$Request["challengeAnswer"])
	at com.amazonaws.services.lambda.runtime.serialization.factories.JacksonFactory$InternalSerializer.fromJson(JacksonFactory.java:184)
Caused by: com.amazonaws.lambda.thirdparty.com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot construct instance of `java.util.LinkedHashMap` (although at least one Creator exists): no String-argument constructor/factory method to deserialize from String value ('1234')
 at [Source: (ByteArrayInputStream); line: 1, column: 642] (through reference chain: com.amazonaws.services.lambda.runtime.events.CognitoUserPoolVerifyAuthChallengeResponseEvent["request"]->com.amazonaws.services.lambda.runtime.events.CognitoUserPoolVerifyAuthChallengeResponseEvent$Request["challengeAnswer"])
	at com.amazonaws.lambda.thirdparty.com.fasterxml.jackson.databind.exc.MismatchedInputException.from(MismatchedInputException.java:63)
	at com.amazonaws.lambda.thirdparty.com.fasterxml.jackson.databind.DeserializationContext.reportInputMismatch(DeserializationContext.java:1432)
	at com.amazonaws.lambda.thirdparty.com.fasterxml.jackson.databind.DeserializationContext.handleMissingInstantiator(DeserializationContext.java:1062)
	at com.amazonaws.lambda.thirdparty.com.fasterxml.jackson.databind.deser.ValueInstantiator._createFromStringFallbacks(ValueInstantiator.java:371)
	at com.amazonaws.lambda.thirdparty.com.fasterxml.jackson.databind.deser.ValueInstantiator.createFromString(ValueInstantiator.java:258)
	at com.amazonaws.lambda.thirdparty.com.fasterxml.jackson.databind.deser.std.MapDeserializer.deserialize(MapDeserializer.java:357)
	at com.amazonaws.lambda.thirdparty.com.fasterxml.jackson.databind.deser.std.MapDeserializer.deserialize(MapDeserializer.java:29)
	at com.amazonaws.lambda.thirdparty.com.fasterxml.jackson.databind.deser.impl.MethodProperty.deserializeAndSet(MethodProperty.java:129)
	at com.amazonaws.lambda.thirdparty.com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:288)
	at com.amazonaws.lambda.thirdparty.com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:151)
	at com.amazonaws.lambda.thirdparty.com.fasterxml.jackson.databind.deser.impl.MethodProperty.deserializeAndSet(MethodProperty.java:129)
	at com.amazonaws.lambda.thirdparty.com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:288)
	at com.amazonaws.lambda.thirdparty.com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:151)
	at com.amazonaws.lambda.thirdparty.com.fasterxml.jackson.databind.ObjectReader._bindAndClose(ObjectReader.java:1719)
	at com.amazonaws.lambda.thirdparty.com.fasterxml.jackson.databind.ObjectReader.readValue(ObjectReader.java:1228)
	at com.amazonaws.services.lambda.runtime.serialization.factories.JacksonFactory$InternalSerializer.fromJson(JacksonFactory.java:182)

[msailes]

Hi @sdaletalentful,

Thanks for reporting the issue.

Mark

[benjaminkomen]

I noticed the same thing.. So I'll have to define my own class to map the json to

[pieterreuse]

Affected me too. Was useful to me to see that this is an issue with events-v3 and not my code.
Defining my own class fixed my issue.

[smirnoal]

Do you mind creating a PR to fix this?

[pieterreuse]

@smirnoal looks like there already is one: #356
However seems like it'd be interesting to some people (including myself) if that commit was also included in the v3 branch.

[smirnoal]

yeah, should be easy cherry-pick