Problem

SonarQube reports a code smell in AdminController.java:
"Define a constant instead of duplicating this literal

redirect:/admin/products (3 times)
redirect:/admin/categories (3 times)
categories (4 times)

Duplicated string literals make code harder to maintain —
if the URL changes, it must be updated in multiple places.

Solution

Define a private static final constant in AdminController:

private static final String REDIRECT_ADMIN_PRODUCTS = "redirect:/admin/products";
private static final String REDIRECT_ADMIN_CATEGORIES = "redirect:/admin/categories";
private static final String VIEW_CATEGORIES = "categories";

Then replace all occurrences with these constant.

Type

• Refactor / Code smell fix