@SuppressWarnings("deprecation")
public void registerDefaultAuthentications() {
getRegisteredAuthentications().add(new HttpBasicHelper());
getRegisteredAuthentications().add(new HttpDigestHelper());
getRegisteredAuthentications().add(new SmtpPlainHelper());
getRegisteredAuthentications().add(new HttpAmazonS3Helper());
// In order to support the deprecated AWS constant
// we need to register another instance of S3 helper.
final AuthenticationHelper helper = new HttpAmazonS3Helper();
helper.setChallengeScheme(ChallengeScheme.HTTP_AWS);
getRegisteredAuthentications().add(helper);
}