code: private synchronized URLClassLoader getClassLoader() {
          if (modelClassLoader == null) {
              List<File> jars = res.filterFiles("jar");     // jars as defined in
              List<File> cli_jars = getExtraResources();    // cli extra jars
              List<File> dirs = res.filterDirectories();    // testing
              List<URL> urls = new ArrayList<URL>();
  
              try {
                  for (int i = 0; i < jars.size(); i++) {
                      urls.add(jars.get(i).toURI().toURL());
                      if (log.isLoggable(Level.CONFIG)) {
                          log.config("classpath entry from simulation: " + jars.get(i));
                      }
                  }
                  for (int i = 0; i < dirs.size(); i++) {
                      urls.add(dirs.get(i).toURI().toURL());
                      if (log.isLoggable(Level.CONFIG)) {
                          log.config("dir entry: " + dirs.get(i));
                      }
                  }
                  for (int i = 0; i < cli_jars.size(); i++) {
                      urls.add(cli_jars.get(i).toURI().toURL());
                      if (log.isLoggable(Level.CONFIG)) {
                          log.config("classpath entry from CLI: " + cli_jars.get(i));
                      }
                  }
                  urls.add(new URL("file:" + System.getProperty("oms.prj") + "/dist/"));
                  if (log.isLoggable(Level.CONFIG)) {
                      log.config("Sim loading classpath : " + "file:" + System.getProperty("oms.prj") + "/dist/");
                  }
              } catch (MalformedURLException ex) {
                  throw new ComponentException("Illegal resource:" + ex.getMessage());
              }
              modelClassLoader = new URLClassLoader(urls.toArray(new URL[0]),
                      Thread.currentThread().getContextClassLoader());
          }
          return modelClassLoader;
      }
docs: get the URL class loader for all the resources (just for jar files
  
  @return
  @throws Exception