import bitel.billing.server.admin.bgsecure.bean.UserGroupManager;
....
List<Integer> groups = userGroupManager.getUserGroups(userID);
for (int group : groups) {
  System.out.println("group = " + group);
}

02-17/14:08:45  INFO [http-bio-0.0.0.0-8080-exec-3] LoggingPrintStream - group = 1
02-17/14:08:45  INFO [http-bio-0.0.0.0-8080-exec-3] LoggingPrintStream - group = 2

import ru.bitel.bgbilling.kernel.module.server.bean.UserManager;
import ru.bitel.bgbilling.kernel.module.common.bean.User;
....
User user = new UserManager(con).getUsersMap().get(userID);
List<Integer> groupss = user.getUserGroups();
for (int group : groupss) {
         System.out.println("group = " + group);
      }