diff --git a/00-backend/src/main/java/de/htwsaar/webshop/config/WebConfig.java b/00-backend/src/main/java/de/htwsaar/webshop/config/WebConfig.java
index a5b58b3..b668194 100644
--- a/00-backend/src/main/java/de/htwsaar/webshop/config/WebConfig.java
+++ b/00-backend/src/main/java/de/htwsaar/webshop/config/WebConfig.java
@@ -12,9 +12,9 @@ public class WebConfig implements WebMvcConfigurer {
     @Override
     public void addCorsMappings(CorsRegistry registry) {
         registry.addMapping("/**")
-            .allowedOrigins("http://localhost:5173") // Erlaube Anfragen von der Frontend-Domain
-            .allowedMethods("GET", "POST", "PUT", "DELETE", "OPTIONS") // Erlaube spezifische HTTP-Methoden
-            .allowedHeaders("*") // Erlaube alle Header
-            .allowCredentials(true); // Erlaube Cookies
+                .allowedOrigins("http://localhost:5173") // Erlaube Anfragen von der Frontend-Domain
+                .allowedMethods("GET", "POST", "PUT", "DELETE", "OPTIONS") // Erlaube spezifische HTTP-Methoden
+                .allowedHeaders("*") // Erlaube alle Header
+                .allowCredentials(true); // Erlaube Cookies
     }
 }
diff --git a/00-backend/src/main/java/de/htwsaar/webshop/controller/AccountController.java b/00-backend/src/main/java/de/htwsaar/webshop/controller/AccountController.java
index 446b922..ab5db5b 100644
--- a/00-backend/src/main/java/de/htwsaar/webshop/controller/AccountController.java
+++ b/00-backend/src/main/java/de/htwsaar/webshop/controller/AccountController.java
@@ -45,11 +45,11 @@ public class AccountController {
             log.warn("[{}] failed Validation, sending bad request", request.getRequestURI());
             return ResponseEntity.badRequest().build();
         }
-        if(accountService.existsWithEmail(account.getEmail())) {
+        if (accountService.existsWithEmail(account.getEmail())) {
             log.warn("[{}] Account cant be created, Email is already in use", request.getRequestURI());
             return ResponseEntity.unprocessableEntity().build();
         }
-        if(accountService.saveNew(account).getId() == null) {
+        if (accountService.saveNew(account).getId() == null) {
             return ResponseEntity.internalServerError().build();
         }
         return ResponseEntity.ok().build();
@@ -63,10 +63,10 @@ public class AccountController {
             log.warn("[{}] failed Validation, sending bad request", request.getRequestURI());
             return ResponseEntity.badRequest().build();
         }
-        if(accountService.existsWithEmail(account.getEmail())) {
+        if (accountService.existsWithEmail(account.getEmail())) {
             return ResponseEntity.badRequest().build();
         }
-        if(!accountService.deleteIfExists(account)) {
+        if (!accountService.deleteIfExists(account)) {
             return ResponseEntity.badRequest().build();
         }
         return ResponseEntity.ok().build();
@@ -74,15 +74,15 @@ public class AccountController {
 
     @RequestMapping(path = ACCOUNT_BASE, method = RequestMethod.GET, produces = "application/json")
     public ResponseEntity<Account> getAccount(HttpServletRequest request,
-                                                   @RequestParam(PARAM_EMAIL) String email,
-                                                   @RequestParam(PARAM_PASSWORD) String password) {
+                                              @RequestParam(PARAM_EMAIL) String email,
+                                              @RequestParam(PARAM_PASSWORD) String password) {
         logRequest(request);
-        if(!accountService.existsWithEmail(email)) {
+        if (!accountService.existsWithEmail(email)) {
             log.warn("[{}] Account doesn't exist", request.getRequestURI());
             return ResponseEntity.badRequest().build();
         }
         Account acc = accountService.isValidLogin(email, password);
-        if(acc == null) {
+        if (acc == null) {
             log.warn("[{}] Invalid Credentials", request.getRequestURI());
             return ResponseEntity.badRequest().build();
         }
@@ -95,22 +95,22 @@ public class AccountController {
                                                  @RequestParam(PARAM_PASSWORD) String password,
                                                  @RequestBody Account account) {
         logRequest(request);
-        if(validatorService.isInvalid(account)) {
+        if (validatorService.isInvalid(account)) {
             log.warn("[{}] failed Validation, sending bad request", request.getRequestURI());
             return ResponseEntity.badRequest().build();
         }
-        if(!accountService.existsWithEmail(email)) {
+        if (!accountService.existsWithEmail(email)) {
             log.warn("[{}] Account doesn't exist", request.getRequestURI());
             return ResponseEntity.badRequest().build();
         }
         Account loggedIn = accountService.isValidLogin(email, password);
-        if(loggedIn == null) {
+        if (loggedIn == null) {
             log.warn("[{}] Invalid Credentials", request.getRequestURI());
             return ResponseEntity.badRequest().build();
         }
         account.setId(loggedIn.getId());
         Account saved = accountService.save(account);
-        if(saved == null) {
+        if (saved == null) {
             return ResponseEntity.internalServerError().build();
         }
         return ResponseEntity.ok(saved);
diff --git a/00-backend/src/main/java/de/htwsaar/webshop/controller/CustomerController.java b/00-backend/src/main/java/de/htwsaar/webshop/controller/CustomerController.java
index 89fa650..291f95c 100644
--- a/00-backend/src/main/java/de/htwsaar/webshop/controller/CustomerController.java
+++ b/00-backend/src/main/java/de/htwsaar/webshop/controller/CustomerController.java
@@ -28,7 +28,7 @@ public class CustomerController {
 
     @RequestMapping(path = CUSTOMER_BASE, method = RequestMethod.GET, produces = "application/json")
     public ResponseEntity<Customer> getCustomerById(HttpServletRequest request,
-                                                   @RequestParam(PARAM_ID) Long customerId) {
+                                                    @RequestParam(PARAM_ID) Long customerId) {
         logRequest(request);
         if (customerId == null) {
             log.warn("[{}] failed Validation, sending bad request", request.getRequestURI());
@@ -43,14 +43,14 @@ public class CustomerController {
 
     @RequestMapping(path = CUSTOMER_BASE, method = RequestMethod.POST, produces = "application/json")
     public ResponseEntity<Customer> createCustomer(HttpServletRequest request,
-                                              @RequestBody Customer customer) {
+                                                   @RequestBody Customer customer) {
         logRequest(request);
         if (validatorService.isInvalid(customer)) {
             log.warn("[{}] failed Validation, sending bad request", request.getRequestURI());
             return ResponseEntity.badRequest().build();
         }
         Customer saved = customerService.save(customer);
-        if(saved.getId() == null) {
+        if (saved.getId() == null) {
             return ResponseEntity.internalServerError().build();
         }
         return ResponseEntity.ok(saved);
@@ -58,7 +58,7 @@ public class CustomerController {
 
     @RequestMapping(path = CUSTOMER_BASE, method = RequestMethod.DELETE, produces = "application/json")
     public ResponseEntity<Void> deleteCustomer(HttpServletRequest request,
-                                              @RequestBody Customer customer) {
+                                               @RequestBody Customer customer) {
         logRequest(request);
         if (validatorService.isInvalid(customer)) {
             log.warn("[{}] failed Validation, sending bad request", request.getRequestURI());
@@ -77,7 +77,7 @@ public class CustomerController {
             log.warn("[{}] failed Validation, sending bad request", request.getRequestURI());
             return ResponseEntity.badRequest().build();
         }
-        if(customerService.findById(id) == null) {
+        if (customerService.findById(id) == null) {
             log.warn("[{}] AccountID doesn't exist", request.getRequestURI());
             return ResponseEntity.badRequest().build();
         }
diff --git a/00-backend/src/main/java/de/htwsaar/webshop/controller/ImageController.java b/00-backend/src/main/java/de/htwsaar/webshop/controller/ImageController.java
index 9126a5e..6daee52 100644
--- a/00-backend/src/main/java/de/htwsaar/webshop/controller/ImageController.java
+++ b/00-backend/src/main/java/de/htwsaar/webshop/controller/ImageController.java
@@ -15,7 +15,8 @@ import java.util.ArrayList;
 import java.util.List;
 import java.util.UUID;
 
-import static de.htwsaar.webshop.config.ControllerPathConfig.*;
+import static de.htwsaar.webshop.config.ControllerPathConfig.IMAGE_ALL;
+import static de.htwsaar.webshop.config.ControllerPathConfig.IMAGE_BASE;
 import static de.htwsaar.webshop.config.ParameterConfig.*;
 import static de.htwsaar.webshop.util.LoggerUtil.logRequest;
 
@@ -33,10 +34,10 @@ public class ImageController {
 
     @RequestMapping(path = IMAGE_ALL, method = RequestMethod.GET, produces = "application/json")
     public ResponseEntity<List<String>> getAll(HttpServletRequest request,
-                                                   @RequestParam(value = PARAM_UUID) UUID uuid) {
+                                               @RequestParam(value = PARAM_UUID) UUID uuid) {
         logRequest(request);
         List<Image> images = imageService.getImagesByUUID(uuid);
-        if(images.isEmpty()) {
+        if (images.isEmpty()) {
             return new ResponseEntity<>(HttpStatus.NO_CONTENT);
         }
         List<String> images_base = new ArrayList<>();
@@ -47,10 +48,10 @@ public class ImageController {
 
     @RequestMapping(path = IMAGE_BASE, method = RequestMethod.GET, produces = "text/plain")
     public ResponseEntity<String> getFirst(HttpServletRequest request,
-                                             @RequestParam(value = PARAM_UUID) UUID uuid) {
+                                           @RequestParam(value = PARAM_UUID) UUID uuid) {
         logRequest(request);
         Image image = imageService.getImageByUUID(uuid);
-        if(image == null) {
+        if (image == null) {
             return new ResponseEntity<>(HttpStatus.NO_CONTENT);
         }
         return ResponseEntity.ok(image.getBase64());
@@ -58,8 +59,8 @@ public class ImageController {
 
     @RequestMapping(path = IMAGE_BASE, method = RequestMethod.POST, produces = "application/json")
     public ResponseEntity<Boolean> add(HttpServletRequest request,
-                                          @RequestParam(value = PARAM_UUID) UUID articleUuid,
-                                          @RequestParam(value = PARAM_IMAGE) MultipartFile file) {
+                                       @RequestParam(value = PARAM_UUID) UUID articleUuid,
+                                       @RequestParam(value = PARAM_IMAGE) MultipartFile file) {
         logRequest(request);
 
         if (articleUuid == null || articleService.findByUUID(articleUuid) == null
@@ -74,8 +75,8 @@ public class ImageController {
 
     @RequestMapping(path = IMAGE_ALL, method = RequestMethod.POST, produces = "application/json")
     public ResponseEntity<Integer> addAll(HttpServletRequest request,
-                                       @RequestParam(value = PARAM_UUID) UUID articleUuid,
-                                       @RequestParam(value = PARAM_IMAGE) List<MultipartFile> files) {
+                                          @RequestParam(value = PARAM_UUID) UUID articleUuid,
+                                          @RequestParam(value = PARAM_IMAGE) List<MultipartFile> files) {
         logRequest(request);
 
         if (articleUuid == null || articleService.findByUUID(articleUuid) == null
diff --git a/00-backend/src/main/java/de/htwsaar/webshop/controller/OrderController.java b/00-backend/src/main/java/de/htwsaar/webshop/controller/OrderController.java
index 69517a2..509adb6 100644
--- a/00-backend/src/main/java/de/htwsaar/webshop/controller/OrderController.java
+++ b/00-backend/src/main/java/de/htwsaar/webshop/controller/OrderController.java
@@ -14,7 +14,8 @@ import java.util.List;
 
 import static de.htwsaar.webshop.config.ControllerPathConfig.ORDER_BASE;
 import static de.htwsaar.webshop.config.ControllerPathConfig.ORDER_GET_ALL;
-import static de.htwsaar.webshop.config.ParameterConfig.*;
+import static de.htwsaar.webshop.config.ParameterConfig.PARAM_CUSTOMER_ID;
+import static de.htwsaar.webshop.config.ParameterConfig.PARAM_ID;
 import static de.htwsaar.webshop.util.LoggerUtil.logRequest;
 
 @RestController
@@ -32,10 +33,10 @@ public class OrderController {
 
     @RequestMapping(path = ORDER_GET_ALL, method = RequestMethod.GET, produces = "application/json")
     public ResponseEntity<List<Order>> getAll(HttpServletRequest request,
-                                                   @RequestParam(value = PARAM_CUSTOMER_ID) Long customerId) {
+                                              @RequestParam(value = PARAM_CUSTOMER_ID) Long customerId) {
         logRequest(request);
         List<Order> orders = orderService.getAllOrders(customerId);
-        if(orders.isEmpty()) {
+        if (orders.isEmpty()) {
             return new ResponseEntity<>(HttpStatus.NO_CONTENT);
         }
         return ResponseEntity.ok(orders);
@@ -43,10 +44,10 @@ public class OrderController {
 
     @RequestMapping(path = ORDER_BASE, method = RequestMethod.GET, produces = "application/json")
     public ResponseEntity<Order> get(HttpServletRequest request,
-                                               @RequestParam(value = PARAM_ID) Long orderId) {
+                                     @RequestParam(value = PARAM_ID) Long orderId) {
         logRequest(request);
         Order image = orderService.getOrderById(orderId);
-        if(image == null) {
+        if (image == null) {
             return new ResponseEntity<>(HttpStatus.NO_CONTENT);
         }
         return ResponseEntity.ok(image);
diff --git a/00-backend/src/main/java/de/htwsaar/webshop/controller/ReviewController.java b/00-backend/src/main/java/de/htwsaar/webshop/controller/ReviewController.java
index 7224de5..22ec83b 100644
--- a/00-backend/src/main/java/de/htwsaar/webshop/controller/ReviewController.java
+++ b/00-backend/src/main/java/de/htwsaar/webshop/controller/ReviewController.java
@@ -13,7 +13,8 @@ import org.springframework.web.bind.annotation.*;
 import java.util.List;
 import java.util.UUID;
 
-import static de.htwsaar.webshop.config.ControllerPathConfig.*;
+import static de.htwsaar.webshop.config.ControllerPathConfig.REVIEW_BASE;
+import static de.htwsaar.webshop.config.ControllerPathConfig.REVIEW_GET_ALL;
 import static de.htwsaar.webshop.config.ParameterConfig.*;
 import static de.htwsaar.webshop.util.LoggerUtil.logRequest;
 
@@ -35,7 +36,7 @@ public class ReviewController {
                                                     @RequestParam(value = PARAM_UUID) UUID uuid) {
         logRequest(request);
         List<ReviewModel> review = reviewService.getAllByUUID(uuid).stream().map(reviewService::toModel).toList();
-        if(review.isEmpty()) {
+        if (review.isEmpty()) {
             return ResponseEntity.noContent().build();
         }
         return ResponseEntity.ok(review);
@@ -46,7 +47,7 @@ public class ReviewController {
                                       @RequestParam(value = PARAM_ID) Long reviewId) {
         logRequest(request);
         Review review = reviewService.getReviewById(reviewId);
-        if(review == null) {
+        if (review == null) {
             return ResponseEntity.noContent().build();
         }
         return ResponseEntity.ok(review);
@@ -60,7 +61,7 @@ public class ReviewController {
         logRequest(request);
 
         if (uuid == null || articleService.findByUUID(uuid) == null
-        || rating < 0 || rating > 10) {
+                || rating < 0 || rating > 10) {
             log.warn("[{}] failed Validation, sending bad request", request.getRequestURI());
             return ResponseEntity.badRequest().body(false);
         }
diff --git a/00-backend/src/main/java/de/htwsaar/webshop/controller/SessionController.java b/00-backend/src/main/java/de/htwsaar/webshop/controller/SessionController.java
index 1852587..8dba0e7 100644
--- a/00-backend/src/main/java/de/htwsaar/webshop/controller/SessionController.java
+++ b/00-backend/src/main/java/de/htwsaar/webshop/controller/SessionController.java
@@ -47,12 +47,12 @@ public class SessionController {
 
     @RequestMapping(value = SESSION_BASE, method = RequestMethod.DELETE, produces = "application/json")
     public ResponseEntity<Boolean> delete(@RequestParam String email, @RequestParam UUID token) {
-        if(email == null || token == null) {
+        if (email == null || token == null) {
             log.warn("Got bad request, email and token");
             return ResponseEntity.badRequest().body(false);
         }
         Session session = sessionService.getByToken(token);
-        if(!sessionService.isValid(session, email)) {
+        if (!sessionService.isValid(session, email)) {
             log.warn("Got bad request, session is invalid");
             return ResponseEntity.badRequest().body(false);
         }
@@ -62,16 +62,16 @@ public class SessionController {
 
     @RequestMapping(value = SESSION_BASE, method = RequestMethod.GET, produces = "application/json")
     public ResponseEntity<Boolean> isValid(@RequestParam String email, @RequestParam UUID token) {
-        if(email == null || token == null) {
+        if (email == null || token == null) {
             log.warn("Got bad request, email and token");
             return ResponseEntity.badRequest().body(false);
         }
         Session session = sessionService.getByToken(token);
-        if(session == null) {
+        if (session == null) {
             log.warn("Got bad request, session is invalid");
             return ResponseEntity.notFound().build();
         }
-        if(sessionService.isValid(session, email)) {
+        if (sessionService.isValid(session, email)) {
             return ResponseEntity.ok(true);
         }
         return ResponseEntity.notFound().build();
diff --git a/00-backend/src/main/java/de/htwsaar/webshop/model/SessionModel.java b/00-backend/src/main/java/de/htwsaar/webshop/model/SessionModel.java
index 0f7bd4e..8169123 100644
--- a/00-backend/src/main/java/de/htwsaar/webshop/model/SessionModel.java
+++ b/00-backend/src/main/java/de/htwsaar/webshop/model/SessionModel.java
@@ -1,9 +1,7 @@
 package de.htwsaar.webshop.model;
 
-import jakarta.validation.constraints.Max;
 import jakarta.validation.constraints.Min;
 import jakarta.validation.constraints.NotNull;
-import jakarta.validation.constraints.Null;
 import lombok.AllArgsConstructor;
 import lombok.Getter;
 import lombok.Setter;
@@ -23,5 +21,4 @@ public class SessionModel {
 
     @Min(VALID_MIN_MILLIS_TIMESTAMP)
     long timeout;
-
 }
diff --git a/00-backend/src/main/java/de/htwsaar/webshop/repository/ArticleRepository.java b/00-backend/src/main/java/de/htwsaar/webshop/repository/ArticleRepository.java
index 735036d..3e99a36 100644
--- a/00-backend/src/main/java/de/htwsaar/webshop/repository/ArticleRepository.java
+++ b/00-backend/src/main/java/de/htwsaar/webshop/repository/ArticleRepository.java
@@ -3,7 +3,6 @@ package de.htwsaar.webshop.repository;
 import de.htwsaar.webshop.repository.entities.Article;
 import lombok.NonNull;
 import org.springframework.data.jpa.repository.JpaRepository;
-import org.springframework.data.jpa.repository.Query;
 import org.springframework.stereotype.Repository;
 
 import java.util.Optional;
diff --git a/00-backend/src/main/java/de/htwsaar/webshop/repository/ReviewRepository.java b/00-backend/src/main/java/de/htwsaar/webshop/repository/ReviewRepository.java
index a0fb8f6..977471c 100644
--- a/00-backend/src/main/java/de/htwsaar/webshop/repository/ReviewRepository.java
+++ b/00-backend/src/main/java/de/htwsaar/webshop/repository/ReviewRepository.java
@@ -1,15 +1,14 @@
 package de.htwsaar.webshop.repository;
 
-import java.util.List;
-import java.util.UUID;
-import java.util.stream.Stream;
-
-import org.springframework.data.jpa.repository.JpaRepository;
-import org.springframework.stereotype.Repository;
-
 import de.htwsaar.webshop.repository.entities.Review;
 import jakarta.validation.constraints.NotNull;
 import jakarta.validation.constraints.Positive;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+import java.util.List;
+import java.util.UUID;
+import java.util.stream.Stream;
 
 @Repository
 public interface ReviewRepository extends JpaRepository<Review, Long> {
diff --git a/00-backend/src/main/java/de/htwsaar/webshop/repository/entities/Article.java b/00-backend/src/main/java/de/htwsaar/webshop/repository/entities/Article.java
index 1bfa0f3..b056edf 100644
--- a/00-backend/src/main/java/de/htwsaar/webshop/repository/entities/Article.java
+++ b/00-backend/src/main/java/de/htwsaar/webshop/repository/entities/Article.java
@@ -3,11 +3,7 @@ package de.htwsaar.webshop.repository.entities;
 import jakarta.persistence.*;
 import jakarta.validation.constraints.Max;
 import jakarta.validation.constraints.Min;
-import lombok.AllArgsConstructor;
-import lombok.Getter;
-import lombok.NoArgsConstructor;
-import lombok.Setter;
-import lombok.ToString;
+import lombok.*;
 
 import java.util.ArrayList;
 import java.util.List;
diff --git a/00-backend/src/main/java/de/htwsaar/webshop/service/AccountService.java b/00-backend/src/main/java/de/htwsaar/webshop/service/AccountService.java
index d23d46c..313a417 100644
--- a/00-backend/src/main/java/de/htwsaar/webshop/service/AccountService.java
+++ b/00-backend/src/main/java/de/htwsaar/webshop/service/AccountService.java
@@ -4,8 +4,12 @@ import de.htwsaar.webshop.repository.entities.Account;
 
 public interface AccountService {
     Account saveNew(Account account);
+
     Account save(Account account);
+
     boolean deleteIfExists(Account account);
+
     Account isValidLogin(String email, String password);
+
     boolean existsWithEmail(String email);
 }
\ No newline at end of file
diff --git a/00-backend/src/main/java/de/htwsaar/webshop/service/CustomerService.java b/00-backend/src/main/java/de/htwsaar/webshop/service/CustomerService.java
index 6f66c38..697bed8 100644
--- a/00-backend/src/main/java/de/htwsaar/webshop/service/CustomerService.java
+++ b/00-backend/src/main/java/de/htwsaar/webshop/service/CustomerService.java
@@ -4,6 +4,8 @@ import de.htwsaar.webshop.repository.entities.Customer;
 
 public interface CustomerService {
     Customer save(Customer customer);
+
     void delete(Customer customer);
+
     Customer findById(Long id);
 }
diff --git a/00-backend/src/main/java/de/htwsaar/webshop/service/OrderService.java b/00-backend/src/main/java/de/htwsaar/webshop/service/OrderService.java
index 9a6c2b4..b3d13ba 100644
--- a/00-backend/src/main/java/de/htwsaar/webshop/service/OrderService.java
+++ b/00-backend/src/main/java/de/htwsaar/webshop/service/OrderService.java
@@ -6,7 +6,10 @@ import java.util.List;
 
 public interface OrderService {
     Order save(Order order);
+
     void delete(Long orderId);
+
     Order getOrderById(Long orderId);
+
     List<Order> getAllOrders(Long customerId);
 }
diff --git a/00-backend/src/main/java/de/htwsaar/webshop/service/PasswordService.java b/00-backend/src/main/java/de/htwsaar/webshop/service/PasswordService.java
index 5dbc1e0..694ce58 100644
--- a/00-backend/src/main/java/de/htwsaar/webshop/service/PasswordService.java
+++ b/00-backend/src/main/java/de/htwsaar/webshop/service/PasswordService.java
@@ -2,5 +2,6 @@ package de.htwsaar.webshop.service;
 
 public interface PasswordService {
     String hashPassword(String password);
+
     boolean verifyPassword(String password, String hashedPassword);
 }
\ No newline at end of file
diff --git a/00-backend/src/main/java/de/htwsaar/webshop/service/ReviewService.java b/00-backend/src/main/java/de/htwsaar/webshop/service/ReviewService.java
index cd03232..f621ab8 100644
--- a/00-backend/src/main/java/de/htwsaar/webshop/service/ReviewService.java
+++ b/00-backend/src/main/java/de/htwsaar/webshop/service/ReviewService.java
@@ -1,16 +1,21 @@
 package de.htwsaar.webshop.service;
 
-import java.util.List;
-import java.util.UUID;
-
 import de.htwsaar.webshop.model.ReviewModel;
 import de.htwsaar.webshop.repository.entities.Review;
 
+import java.util.List;
+import java.util.UUID;
+
 public interface ReviewService {
     Review save(Review review);
+
     Review save(UUID articleUuid, int rating, String content);
+
     void delete(Long reviewId);
+
     Review getReviewById(Long id);
+
     List<Review> getAllByUUID(UUID uuid);
+
     ReviewModel toModel(Review review);
 }
diff --git a/00-backend/src/main/java/de/htwsaar/webshop/service/SessionService.java b/00-backend/src/main/java/de/htwsaar/webshop/service/SessionService.java
index 95d3e05..b7e53c6 100644
--- a/00-backend/src/main/java/de/htwsaar/webshop/service/SessionService.java
+++ b/00-backend/src/main/java/de/htwsaar/webshop/service/SessionService.java
@@ -1,6 +1,5 @@
 package de.htwsaar.webshop.service;
 
-import de.htwsaar.webshop.model.SessionModel;
 import de.htwsaar.webshop.repository.entities.Account;
 import de.htwsaar.webshop.repository.entities.Session;
 
@@ -8,9 +7,14 @@ import java.util.UUID;
 
 public interface SessionService {
     Session create(Account account);
+
     void delete(Session session);
+
     Session findByAccount(Account account);
+
     Session getByToken(UUID token);
+
     boolean isValid(Session session, String email);
+
     boolean isValid(UUID token, String email);
 }
diff --git a/00-backend/src/main/java/de/htwsaar/webshop/service/impl/AccountServiceImpl.java b/00-backend/src/main/java/de/htwsaar/webshop/service/impl/AccountServiceImpl.java
index 32419d0..0f4ae38 100644
--- a/00-backend/src/main/java/de/htwsaar/webshop/service/impl/AccountServiceImpl.java
+++ b/00-backend/src/main/java/de/htwsaar/webshop/service/impl/AccountServiceImpl.java
@@ -32,7 +32,7 @@ public class AccountServiceImpl implements AccountService {
     @Override
     public boolean deleteIfExists(Account account) {
         Account tbd = accountRepository.getAccountByEmail(account.getEmail());
-        if(tbd == null) {
+        if (tbd == null) {
             return false;
         }
         accountRepository.delete(tbd);
@@ -42,7 +42,7 @@ public class AccountServiceImpl implements AccountService {
     @Override
     public Account isValidLogin(String email, String password) {
         Account acc = accountRepository.getAccountByEmail(email);
-        if(acc == null) {
+        if (acc == null) {
             return null;
         }
         return passwordService.verifyPassword(password, acc.getPassword()) ? acc : null;
diff --git a/00-backend/src/main/java/de/htwsaar/webshop/service/impl/ImageServiceImpl.java b/00-backend/src/main/java/de/htwsaar/webshop/service/impl/ImageServiceImpl.java
index 4694f82..43c0aa5 100644
--- a/00-backend/src/main/java/de/htwsaar/webshop/service/impl/ImageServiceImpl.java
+++ b/00-backend/src/main/java/de/htwsaar/webshop/service/impl/ImageServiceImpl.java
@@ -53,7 +53,7 @@ public class ImageServiceImpl implements ImageService {
     @Transactional
     public Image save(UUID uuid, String uri) {
         Article article = articleService.findByUUID(uuid);
-        if(article == null) {
+        if (article == null) {
             return null;
         }
         Image image = new Image(null, article, uri);
@@ -63,12 +63,12 @@ public class ImageServiceImpl implements ImageService {
 
     @Override
     public Image save(UUID uuid, MultipartFile file) {
-        if(uuid == null) {
+        if (uuid == null) {
             log.warn("Got no UUID, aborting");
             return null;
         }
         Article article = articleService.findByUUID(uuid);
-        if(article == null) {
+        if (article == null) {
             log.warn("Could not find article with id {}", uuid);
             return null;
         }
@@ -79,7 +79,7 @@ public class ImageServiceImpl implements ImageService {
 
         try {
             String based64 = Base64.getEncoder().encodeToString(file.getBytes());
-            if(based64 == null || based64.isEmpty()) {
+            if (based64 == null || based64.isEmpty()) {
                 log.warn("Could not save image with id {} and file size {}", uuid, file.getSize());
                 return null;
             }
diff --git a/00-backend/src/main/java/de/htwsaar/webshop/service/impl/ReviewServiceImpl.java b/00-backend/src/main/java/de/htwsaar/webshop/service/impl/ReviewServiceImpl.java
index e0d7027..f79701a 100644
--- a/00-backend/src/main/java/de/htwsaar/webshop/service/impl/ReviewServiceImpl.java
+++ b/00-backend/src/main/java/de/htwsaar/webshop/service/impl/ReviewServiceImpl.java
@@ -32,7 +32,7 @@ public class ReviewServiceImpl implements ReviewService {
 
     @Override
     public Review save(UUID articleUuid, int rating, String content) {
-        if(articleUuid == null) {
+        if (articleUuid == null) {
             return null;
         }
         Review review = new Review(null, content, articleService.findByUUID(articleUuid), rating, System.currentTimeMillis());
diff --git a/00-backend/src/main/java/de/htwsaar/webshop/service/impl/SessionServiceImpl.java b/00-backend/src/main/java/de/htwsaar/webshop/service/impl/SessionServiceImpl.java
index f250ec7..c3f2b75 100644
--- a/00-backend/src/main/java/de/htwsaar/webshop/service/impl/SessionServiceImpl.java
+++ b/00-backend/src/main/java/de/htwsaar/webshop/service/impl/SessionServiceImpl.java
@@ -1,6 +1,5 @@
 package de.htwsaar.webshop.service.impl;
 
-import de.htwsaar.webshop.model.SessionModel;
 import de.htwsaar.webshop.repository.AccountRepository;
 import de.htwsaar.webshop.repository.SessionRepository;
 import de.htwsaar.webshop.repository.entities.Account;
@@ -51,14 +50,14 @@ public class SessionServiceImpl implements SessionService {
 
     @Override
     public boolean isValid(Session session, String email) {
-        if(session == null || email == null) {
+        if (session == null || email == null) {
             return false;
         }
         Account accountEmail = accountRepository.getAccountByEmail(email);
-        if(!session.getAccount().equals(accountEmail)) {
+        if (!session.getAccount().equals(accountEmail)) {
             return false;
         }
-        if(session.getTimeout() >= System.currentTimeMillis()) {
+        if (session.getTimeout() >= System.currentTimeMillis()) {
             log.info("Session with email {} is expired", email);
             delete(session);
             return false;