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spring-boot - Understanding difference between Custom Handler and SpringBootApiGatewayRequestHandler

I'm new to Spring Cloud Function and came across it as one of best solution for developing FaaS based solution. I am specifically writing application for AWS Lambda Service which is back-end of API Gateway. I ran into very interesting problem with My test application and it is around Handler. My test application works well with Custom Handler written as -

which works well when configured as Handler in the AWS Lambda. Then I came across org.springframework.cloud.function.adapter.aws.SpringBootApiGatewayRequestHandler which is available in Spring Cloud Function dependency, so I wanted to get rid of UserProfileHandler hence I changed Handler configuration in AWS Lambda to org.springframework.cloud.function.adapter.aws.SpringBootApiGatewayRequestHandler instead of ...UserProfileHandler and now lambda fails with following error message. Has anyone run into this problem?


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