wro4j-core/src/main/java/ro/isdc/wro/manager/ResourceBundleProcessor.java
private void initAggregatedFolderPath(final HttpServletRequest request, final ResourceType type) {
    if (ResourceType.CSS == type && context.getAggregatedFolderPath() == null) {
      final String requestUri = request.getRequestURI();
      final String cssFolder = StringUtils.removeEnd(requestUri, FilenameUtils.getName(requestUri));
      final String aggregatedFolder = StringUtils.removeStart(cssFolder, request.getContextPath());
      LOG.debug("set aggregatedFolderPath: {}", aggregatedFolder);
      Context.get().setAggregatedFolderPath(aggregatedFolder);
    }
  }
private void initAggregatedFolderPath(final HttpServletRequest request, final ResourceType type) {
    if (ResourceType.CSS == type && context.getAggregatedFolderPath() == null) {
      final String requestUri = request.getRequestURI();
      final String cssFolder = StringUtils.removeEnd(requestUri, FilenameUtils.getName(requestUri));
      final String aggregatedFolder = StringUtils.removeStart(cssFolder, request.getContextPath());
      LOG.debug("set aggregatedFolderPath: {}", aggregatedFolder);
      Context.get().setAggregatedFolderPath(aggregatedFolder);
    }
  }
Set the aggregatedFolderPath if required.