* @see AmazonS3Client#AmazonS3Client(AWSCredentials)
     * @see AmazonS3Client#AmazonS3Client(AWSCredentials, ClientConfiguration)
     */
    public AmazonS3Client() {
        this(new AWSCredentialsProviderChain(
                new EnvironmentVariableCredentialsProvider(),
                new SystemPropertiesCredentialsProvider(),
                new ProfileCredentialsProvider(),
                new InstanceProfileCredentialsProvider()) {
            public AWSCredentials getCredentials() {