private void mergeWithDefaultConfiguration() {
    final ArrayList<Configuration> cfgList = new ArrayList<Configuration>();
    for (LanguageInjectionSupport support : InjectorUtils.getActiveInjectionSupports()) {
      final String config = support.getDefaultConfigUrl();
      final URL url = config == null ? null : support.getClass().getResource(config);
      if (url != null) {
        try {
          cfgList.add(load(url.openStream()));
        } catch (Exception e) {
          LOG.warn(e);
        }
      }
    }
    final THashSet<Object> visited = new THashSet<Object>();
    for (IdeaPluginDescriptor pluginDescriptor : PluginManager.getPlugins()) {
      if (pluginDescriptor instanceof IdeaPluginDescriptorImpl
          && !((IdeaPluginDescriptorImpl) pluginDescriptor).isEnabled()) continue;
      final ClassLoader loader = pluginDescriptor.getPluginClassLoader();
      if (!visited.add(loader)) continue;
      if (loader instanceof PluginClassLoader && ((PluginClassLoader) loader).getUrls().isEmpty())
        continue;
      try {
        final Enumeration<URL> enumeration = loader.getResources("META-INF/languageInjections.xml");
        if (enumeration == null) continue;
        while (enumeration.hasMoreElements()) {
          URL url = enumeration.nextElement();
          if (!visited.add(url.getFile())) continue; // for DEBUG mode
          try {
            cfgList.add(load(url.openStream()));
          } catch (Exception e) {
            LOG.warn(e);
          }
        }
      } catch (Exception e) {
        LOG.warn(e);
      }
    }

    final ArrayList<BaseInjection> originalInjections = new ArrayList<BaseInjection>();
    final ArrayList<BaseInjection> newInjections = new ArrayList<BaseInjection>();
    myDefaultInjections = new ArrayList<BaseInjection>();
    for (String supportId : InjectorUtils.getActiveInjectionSupportIds()) {
      for (Configuration cfg : cfgList) {
        final List<BaseInjection> imported = cfg.getInjections(supportId);
        myDefaultInjections.addAll(imported);
        importInjections(getInjections(supportId), imported, originalInjections, newInjections);
      }
    }
    replaceInjections(newInjections, originalInjections);
  }
  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();
  }
  @SuppressWarnings({"HardCodedStringLiteral"})
  static Method getAddUrlMethod(final ClassLoader loader) throws NoSuchMethodException {
    if (loader instanceof URLClassLoader) {
      final Method addUrlMethod = URLClassLoader.class.getDeclaredMethod("addURL", URL.class);
      addUrlMethod.setAccessible(true);
      return addUrlMethod;
    }

    return loader.getClass().getDeclaredMethod("addURL", URL.class);
  }
  private static List<BaseInjection> loadDefaultInjections() {
    final ArrayList<Configuration> cfgList = new ArrayList<Configuration>();
    final THashSet<Object> visited = new THashSet<Object>();
    for (LanguageInjectionConfigBean configBean :
        Extensions.getExtensions(LanguageInjectionSupport.CONFIG_EP_NAME)) {
      PluginDescriptor descriptor = configBean.getPluginDescriptor();
      final ClassLoader loader = descriptor.getPluginClassLoader();
      try {
        final Enumeration<URL> enumeration = loader.getResources(configBean.getConfigUrl());
        if (enumeration == null || !enumeration.hasMoreElements()) {
          LOG.warn(descriptor.getPluginId() + ": " + configBean.getConfigUrl() + " was not found");
        } else {
          while (enumeration.hasMoreElements()) {
            URL url = enumeration.nextElement();
            if (!visited.add(url.getFile())) continue; // for DEBUG mode
            try {
              cfgList.add(load(url.openStream()));
            } catch (Exception e) {
              LOG.warn(e);
            }
          }
        }
      } catch (Exception e) {
        LOG.warn(e);
      }
    }

    final ArrayList<BaseInjection> defaultInjections = new ArrayList<BaseInjection>();
    for (String supportId : InjectorUtils.getActiveInjectionSupportIds()) {
      for (Configuration cfg : cfgList) {
        final List<BaseInjection> imported = cfg.getInjections(supportId);
        defaultInjections.addAll(imported);
      }
    }
    return defaultInjections;
  }