code: public void destroy() {
  		// Synchronize, in case multiCadiFilters are used.
  		synchronized(CadiHTTPManip.noAdditional) {
  			if(--count<=0 && httpChecker!=null) {
  				httpChecker.destroy();
  				httpChecker=null;
  				access=null;
  				pathExceptions=null;
  			}
  		}
  	}
docs: Containers call "destroy" when time to cleanup