private boolean validateValues(String values) {
    if (values.matches(INVALID_KERBEROS_CHAR)) {
      return true;
    }
    return false;
  }
Create an artifact resource instance.

@param clusterName  cluster name
@param artifactName artifact name

@return an artifact resource instance
ambari-server/src/main/java/org/apache/ambari/server/api/services/ClusterService.java