docs: public Client findClient(String clientUUID, Integer profileId) throws Exception {
          Client client = null;
          /* ERROR CODE: 500 WHEN TRYING TO DELETE A SERVER GROUP.
              THIS APPEARS TO BE BECAUSE CLIENT UUID IS NULL.
           */
          /* CODE ADDED TO PREVENT NULL POINTERS. */
          if (clientUUID == null) {
              clientUUID = "";
          }
  
          // first see if the clientUUID is actually a uuid.. it might be a friendlyName and need conversion
          /* A UUID IS A UNIVERSALLY UNIQUE IDENTIFIER. */
          if (clientUUID.compareTo(Constants.PROFILE_CLIENT_DEFAULT_ID) != 0 &&
              !clientUUID.matches("[\\w]{8}-[\\w]{4}-[\\w]{4}-[\\w]{4}-[\\w]{12}")) {
              Client tmpClient = this.findClientFromFriendlyName(profileId, clientUUID);
  
              // if we can't find a client then fall back to the default ID
              if (tmpClient == null) {
                  clientUUID = Constants.PROFILE_CLIENT_DEFAULT_ID;
              } else {
                  return tmpClient;
              }
          }
  
          PreparedStatement statement = null;
          ResultSet results = null;
          try (Connection sqlConnection = sqlService.getConnection()) {
              String queryString = "SELECT * FROM " + Constants.DB_TABLE_CLIENT +
                  " WHERE " + Constants.CLIENT_CLIENT_UUID + " = ?";
  
              if (profileId != null) {
                  queryString += " AND " + Constants.GENERIC_PROFILE_ID + "=?";
              }
  
              statement = sqlConnection.prepareStatement(queryString);
              statement.setString(1, clientUUID);
  
              if (profileId != null) {
                  statement.setInt(2, profileId);
              }
  
              results = statement.executeQuery();
              if (results.next()) {
                  client = this.getClientFromResultSet(results);
              }
          } catch (Exception e) {
              throw e;
          } finally {
              try {
                  if (results != null) {
                      results.close();
                  }
              } catch (Exception e) {
              }
              try {
                  if (statement != null) {
                      statement.close();
                  }
              } catch (Exception e) {
              }
          }
  
          return client;
      }