code: @FFDCIgnore({ MalformedClaimException.class })
      private void convertToList(String claimName, JwtClaims claimsSet) {
          List<String> list = null;
          try {
              list = claimsSet.getStringListClaimValue(claimName);
          } catch (MalformedClaimException e) {
              try {
                  String value = claimsSet.getStringClaimValue(claimName);
                  if (value != null) {
                      list = new ArrayList<String>();
                      list.add(value);
                      claimsSet.setClaim(claimName, list);
                  }
              } catch (MalformedClaimException e1) {
                  if (tc.isDebugEnabled()) {
                      Tr.debug(tc, "The value for the claim [" + claimName + "] could not be convered to a string list: " + e1.getLocalizedMessage());
                  }
              }
          }
      }
docs: Converts the value for the specified claim into a String list.