code: protected static String getStemPrefix() {
  
          String uportalStem = GrouperClientUtils.propertiesValue(STEM_PREFIX, false);
  
          // make sure it ends in colon
          if (!StringUtils.isBlank(uportalStem)) {
              if (uportalStem.endsWith(":")) {
                  uportalStem = uportalStem.substring(0, uportalStem.length() - 1);
              }
          }
  
          return uportalStem;
      }
docs: Get the prefix for the stem containing uPortal groups. If this value is non-empty, all groups
  will be required to be prefixed with the specified stem name.
  
  @return the uportal stem in the registry, without trailing colon