'AWS Lambda and Abstract classes - RequestHandler

I have a general question about AWS lambda and abstract classes in Java.

I've recently upgraded an AWS lambda project to Java 11 and now my handleRequest call is getting the response

"{}"

It seems to be due to my output object being an abstract class as we return different children objects depending on business logic.

MyLambdaClass implements
    RequestHandler<InputObject, OutputAbstractObject>

My question is, how come this is now an issue with Java 11. I'm aware I can use RequestStreamHandler and do the serialisation myself but ideally I'd like to keep as much code the same with the upgrade.

javaaws-lambdaabstract-classjava-11pojo


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