public static AwsCredentialsProvider getInstance(final String credentialAccessKey, final String credentialSecretKey) {
        return getInstance(credentialAccessKey, credentialSecretKey, null, null);
    }
Gets instance.

@param credentialAccessKey the credential access key
@param credentialSecretKey the credential secret key
@return the instance
support/cas-server-support-aws/src/main/java/org/apereo/cas/aws/ChainingAWSCredentialsProvider.java