Refactor Controller: Make jwtTokenProvider non-static and remove debug print statements

backend/src/main/java/hu/pazmany/controller/Controller.java

@@ -25,7 +25,7 @@ import java.util.regex.Pattern;
 public class Controller {
 	private final DogService dogService;
 	private final UserService userService;
-	private static final JwtTokenProvider jwtTokenProvider = JwtTokenProvider.getInstance();
+	private final JwtTokenProvider jwtTokenProvider = JwtTokenProvider.getInstance();
 
 	@Autowired
 	public Controller(DogService dogService, UserService userService) {
@@ -53,7 +53,6 @@ public class Controller {
 
 	@PostMapping("/newdog")
 	public ResponseEntity<?> addNewDog(@RequestBody DetailedDogDTO dto, @RequestHeader("Authorization") String token) {
-		System.out.println(token);
 		if(!isValidToken(token)) return ResponseEntity.status(HttpStatus.UNAUTHORIZED).build();
 
 		// Save the dog and picture

backend/src/main/java/hu/pazmany/security/JwtTokenProvider.java

@@ -23,7 +23,6 @@ public class JwtTokenProvider {
                 .setSubject(String.valueOf(userId))
                 .signWith(secretKey)
                 .compact();
-        System.out.println("Generated Token: " + token);
         return token;
     }
 
@@ -36,12 +35,10 @@ public class JwtTokenProvider {
                     .parseClaimsJws(token)
                     .getBody()
                     .getSubject();
-            System.out.println(userId);
             // Check if the username is not null or empty
             return userId != null && !userId.isEmpty();
         } catch (JwtException | IllegalArgumentException e) {
             // Token is invalid or malformed
-            System.out.println("Token validation failed: " + e.getMessage());
             return false;
         }
     }

backend/src/main/java/hu/pazmany/service/UserService.java

@@ -48,7 +48,6 @@ public class UserService {
                 UserDTO userDTO = new UserDTO();
                 userDTO.setUsername(request.getUsername());
                 userDTO.setToken(token);
-                System.out.println("login: " + token);
                 return userDTO;
             }
         }
@@ -56,10 +55,6 @@ public class UserService {
         return null;
     }
 
-    private String generateToken(Integer userId, JwtTokenProvider jwtTokenProvider) {
-        return jwtTokenProvider.generateToken(userId);
-    }
-
     public boolean isUserExists(String username) {
         return userRepository.existsByUsername(username);
     }