public Set<DistributedMember> findServers(AbstractConfiguration configuration) {
    if (configuration instanceof RegionScoped) {
      Set<String> groups = findGroups(((RegionScoped) configuration).getRegionName());
      if (groups.size() == 0) {
        return Collections.emptySet();
      }
      return findServers(groups.toArray(new String[0]));
    }

    return findServers(configuration.getGroup());
  }
@param groups should not be null contains no element
geode-core/src/main/java/org/apache/geode/management/internal/configuration/validators/MemberValidator.java