code: private Instance getExistingBundle(final String _uuid)
      {
          Instance ret = null;
          try {
              final QueryBuilder queryBldr = new QueryBuilder(Type.get(DBPropertiesUpdate.TYPE_PROPERTIES_BUNDLE));
              queryBldr.addWhereAttrEqValue("UUID", _uuid);
              final InstanceQuery query = queryBldr.getQuery();
              query.executeWithoutAccessCheck();
              if (query.next()) {
                  ret = query.getCurrentValue();
              }
          } catch (final EFapsException e) {
              DBPropertiesUpdate.LOG.error("getExistingBundle(String)", e);
          }
          return ret;
      }
docs: Is the Bundle allready existing.
  
  @param _uuid UUID of the Bundle
  @return ID of the Bundle if existing, else null