public UploadPartRequest withSSECustomerKey(SSECustomerKey sseKey) {
        setSSECustomerKey(sseKey);
        return this;
    }
Sets the optional customer-provided server-side encryption key to use to
encrypt the object part being uploaded, and returns the updated request
object so that additional method calls can be chained together.

@param sseKey
           The optional customer-provided server-side encryption key to
           use to encrypt the object part being uploaded.

@return This updated request object so that additional method calls can
        be chained together.
aws-java-sdk-s3/src/main/java/com/amazonaws/services/s3/model/UploadPartRequest.java