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);
  }