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Issue with Map types in CognitoUserPoolPreTokenGenerationEventV2 -> GroupOverrideDetails #516
Description
According to my support representative and the documentation https://docs.aws.amazon.com/cognito/latest/developerguide/user-pool-lambda-pre-token-generation.html#aws-lambda-triggers-pre-token-generation-example-version-2-overview, the response should return list types for groupsToOverride and iamRolesToOverride even when I use V2 pre token generation, not Map<String, String>. My experiences with Map<String, String> here is that cognito fails when I return an object generated by the current java sdk with map here instead of a list, so I suspect that the SDK uses the wrong types here. Thank you in advance for looking into my issue!
Activity
lachlanodonnell commentedon Jan 28, 2025
I found this out the hard way - after spending a couple of hours I eventually use Jackson to convert the input CognitoUserPoolPreTokenGenerationEventV2 object to a Map and manually set the List for response group override. Please update the Java objects for CognitoUserPoolPreTokenGenerationEventV2.GroupOverrideDetails as they should be Lists, not Maps.
Found on 3.14.0 (maven central).
smirnoal commentedon Mar 19, 2026
hey folks, were you able to verify the fix? can the issue be closed now?
lachlanodonnell commentedon Mar 20, 2026
This is no longer an issue for me since a SDK2 update (last year).