code: public static ClassLoader getParaClassLoader() {
  		if (paraClassLoader == null) {
  			try {
  				ClassLoader currentClassLoader = Thread.currentThread().getContextClassLoader();
  				List<URL> jars = new ArrayList<>();
  				File lib = new File(Config.getConfigParam("plugin_folder", "lib/"));
  				if (lib.exists() && lib.isDirectory()) {
  					for (File file : FileUtils.listFiles(lib, new String[]{"jar"}, false)) {
  						jars.add(file.toURI().toURL());
  					}
  				}
  				paraClassLoader = new URLClassLoader(jars.toArray(new URL[0]), currentClassLoader);
  				// Thread.currentThread().setContextClassLoader(paraClassLoader);
  			} catch (Exception e) {
  				logger.error(null, e);
  			}
  		}
  		return paraClassLoader;
  	}
docs: Returns the {@link URLClassLoader} classloader for Para.
  Used for loading JAR files from 'lib/*.jar'.
  @return a classloader