code: protected List<Instance> getSuper(final Instance _instance)
          throws EFapsException
      {
          final List<Instance> ret = new ArrayList<>();
          final QueryBuilder queryBldr = new QueryBuilder(getClassName4Type2Type());
          queryBldr.addWhereAttrEqValue(CIAdminProgram.Program2Program.From, _instance.getId());
          final MultiPrintQuery multi = queryBldr.getPrint();
          multi.addAttribute(CIAdminProgram.Program2Program.To);
          multi.execute();
          if (multi.next()) {
              final Instance instance = Instance.get(getClassName4Type().getType(),
                                               multi.<Long>getAttribute(CIAdminProgram.Program2Program.To));
              ret.add(instance);
              ret.addAll(getSuper(instance));
          }
          return ret;
      }
docs: Recursive method that searches the SuperSource for the current Instance
  identified by the oid.
  
  @param _instance Instance the Super Instance will be searched
  @return List of SuperSources in reverse order
  @throws EFapsException error