package example;

import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.LambdaLogger;
import com.amazonaws.services.lambda.runtime.RequestHandler;
import com.amazonaws.services.s3.model.S3Event;

public class Hello implements RequestHandler<S3Event, Object> {
    public String handleRequest(S3Event input, Context context) {
        return "Hello";
    }
}

return new Gson().fromJson(jsonObject, Object.class);