code: public ExclusionFilter createExclusionFilter() throws AccessControlException {
  		ExclusionFilterFactory factory = getExclusionFactory();
  		if (factory != null) {
  			ExclusionFilter exclusionFilter = null;
  			if (factory instanceof ContextExclusionFilterFactory) {
  				exclusionFilter = ((ContextExclusionFilterFactory)factory).getExclusionFilter(this);
  			} else {
  				exclusionFilter = factory.get();
  			}
  			if (exclusionFilter == null) {
  				throw new AdministrativeAccessControlException(
  						"AccessControl list unavailable");
  			}
  			return exclusionFilter;
  		}
  		return null;
  	}
docs: Return new instance of {@link ExclusionFilter} instance for this AccessPoint.
  @throws AccessControlException If it cannot instantiate ExclusionFilter when
  it's supposed to (i.e. configured but failed to complete because of network
  error etc.)