static Collection<URL> getClassLoaderUrls() {
    final ClassLoader classLoader = PluginManagerCore.class.getClassLoader();
    final Class<? extends ClassLoader> aClass = classLoader.getClass();
    try {
      @SuppressWarnings("unchecked")
      List<URL> urls = (List<URL>) aClass.getMethod("getUrls").invoke(classLoader);
      return urls;
    } catch (IllegalAccessException ignored) {
    } catch (InvocationTargetException ignored) {
    } catch (NoSuchMethodException ignored) {
    }

    if (classLoader instanceof URLClassLoader) {
      return Arrays.asList(((URLClassLoader) classLoader).getURLs());
    }

    return Collections.emptyList();
  }
  private static void cleanupSwingDataStructures() throws Exception {
    Class<?> aClass = Class.forName("javax.swing.KeyboardManager");

    Method get = aClass.getMethod("getCurrentManager");
    get.setAccessible(true);
    Object manager = get.invoke(null);
    {
      Field mapF = aClass.getDeclaredField("componentKeyStrokeMap");
      mapF.setAccessible(true);
      Object map = mapF.get(manager);
      ((Map) map).clear();
    }
    {
      Field mapF = aClass.getDeclaredField("containerMap");
      mapF.setAccessible(true);
      Object map = mapF.get(manager);
      ((Map) map).clear();
    }
  }