String category = req.getParameter(Parameters.CATEGORY_ID.getId());
CategoryService cs = new CategoryService();
Category cat = cs.getById(Long.parseLong(category));
ProductListingView pl = new ProductListingView(getMainView());
pl.setProducts(service.getProductsByCategory(Long.parseLong(category)));
l.info("displaying category: "+cat.getName());
ContentView cv = new ContentView(JSP_PRODUCT_LISTING, cat.getName());
pl.getContentViews().add(cv);
return pl;