code: private void configurePlugins(final File fDir) throws PluginConfigurationException {
          LOG.trace("READING PLUGIN CONFIGURATION FROM DIRECTORY {}", fDir.getName());
          StreamManager streamMgr = new StreamManager();
  
          File[] vfJars = fDir.listFiles(JAR_FILE_FILTER);
  
          if (vfJars == null || vfJars.length == 0) {
              return;
          }
  
          // Initializing classloader
          List<URL> vUrls = new ArrayList<URL>(vfJars.length);
  
          ClassLoader ul = null;
  
          for (int j = 0; j < vfJars.length; j++) {
              try {
                  vUrls.add(vfJars[j].toURI().toURL());
              } catch (MalformedURLException e) {
                  // should never happen
                  throw new IllegalStateException(e.getMessage(), e);
              }
          }
  
          ul = new JNRPEClassLoader(vUrls);
  
          try {
              for (File file : vfJars) {
                  JarFile jarFile = null;
                  try {
                      jarFile = new JarFile(file);
                      JarEntry entry = jarFile.getJarEntry("plugin.xml");
                      if (entry == null) {
                          entry = jarFile.getJarEntry("jnrpe_plugins.xml");
                      }
  
                      if (entry == null) {
                          // The jar do not contain a jnrpe_plugins.xml nor a
                          // plugin.xml file...
                          continue;
                      }
  
                      InputStream in = streamMgr.handle(jarFile.getInputStream(entry));
                      PluginRepositoryUtil.loadFromXmlPluginPackageDefinitions(this, ul, in);
                      in.close();
  
                  } catch (Exception e) {
                      LOG.error("Skipping plugin package contained in file '{}' because of the following error : {}",
                              new String[] { file.getName(), e.getMessage() }, e);
                  } finally {
                      try {
                          jarFile.close();
                      } catch (Exception e) {
                          // Intentionally ignored...
                          LOG.warn("An error has occurred closing jar file '{}'",file.getName(), e);
                      }
                  }
              }
  
          } finally {
              streamMgr.closeAll();
          }
      }
docs: Loads all the plugins definitions from the given directory.
  
  @param fDir
  The plugin package directory.
  @throws PluginConfigurationException
  -