public List<String> getAudiences() {
    final String audiencesString = getValue(SSO_JWT_AUDIENCES, configurationMap);
    final List<String> audiences;
    if (StringUtils.isNotEmpty(audiencesString)) {
      // parse into the list
      String[] audArray = audiencesString.split(",");
      audiences = new ArrayList<>();
      Collections.addAll(audiences, audArray);
    } else {
      audiences = null;
    }
    
    return audiences;
  }
Class describes parameters of external JWT authentication provider
ambari-server/src/main/java/org/apache/ambari/server/security/authentication/jwt/JwtAuthenticationProperties.java