_LOG.log(Level.INFO, "Register feature demo '" + featureDemo.getDisplayName() + "' in category '" + categoryName + "'");
IFeatureDemoCategory category = categoriesRegistry.get(categoryId);
if (category == null) {
category = new FeatureDemoCategoryImpl(categoryId, categoryName);
categories.add(category);
categoriesRegistry.put(categoryId, category);
}