private void showProjectsFromCategory(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { categoryId = Integer.valueOf(req.getParameter("categoryId")); req.setAttribute("categoryName", category.getCategoryList().get(categoryId - 1)); req.setAttribute("projectsFromCategory", project.getProjectFromCategory(categoryId).values()); req.getRequestDispatcher("projects.jsp").forward(req, resp); }