I am building a simple web applications with 3 layers - DAO, Service, MVC. When in my Controller I want to delete menu group and it contains menus I am getting ConstraintViolationException.
Where should I handle this exception? In DAO, Service, or in Controller? Currently I am handling the exception in Controller.
My code below.
DAO method for deleting menu groups:
@Override
public void delete(E e){
if (e == null){
throw new DaoException("Entity can't be null.");
}
getCurrentSession().delete(e);
}
Service method for deleting menu groups:
@Override
@Transactional(readOnly = false)
public void delete(MenuGroupEntity menuGroupEntity) {
menuGroupDao.delete(menuGroupEntity);
}
Controller method for deleting menu groups in Controller:
@RequestMapping(value = "/{menuGroupId}/delete", method = RequestMethod.GET)
public ModelAndView delete(@PathVariable Long menuGroupId, RedirectAttributes redirectAttributes){
MenuGroupEntity menuGroupEntity = menuGroupService.find(menuGroupId);
if (menuGroupEntity != null){
try {
menuGroupService.delete(menuGroupEntity);
redirectAttributes.addFlashAttribute("flashMessage", "admin.menu-group-deleted");
redirectAttributes.addFlashAttribute("flashMessageType", "success");
} catch (Exception e){
redirectAttributes.addFlashAttribute("flashMessage", "admin.menu-group-could-not-be-deleted");
redirectAttributes.addFlashAttribute("flashMessageType", "danger");
}
}
return new ModelAndView("redirect:/admin/menu-group");
}
