private boolean needClassLoader(String procNames, Iterable<? extends File> workingpath) {
        if (procNames != null)
            return true;

        String procPath;
        URL[] urls = new URL[1];
        for(File pathElement : workingpath) {
            try {
                urls[0] = pathElement.toURI().toURL();
                if (ServiceProxy.hasService(Processor.class, urls))
                    return true;
            } catch (MalformedURLException ex) {
                throw new AssertionError(ex);
            }
            catch (ServiceProxy.ServiceConfigurationError e) {
                log.error("proc.bad.config.file", e.getLocalizedMessage());
                return true;
            }
        }

        return false;
    }