MyLambda.java

public class MyLambda {
    public void handler(S3Put input) {
        // Execution code will go here
    }

    public static class S3Put {
        public java.util.List<S3PutRecord> Records;

        public static class S3PutRecord {
            public S3PutRecordS3 s3;

            public static class S3PutRecordS3 {
                public S3PutRecordS3Object object;

                public static class S3PutRecordS3Object {
                    public String key;
                }
            }
        }
    }
}