did all required tsks

.gitignore

@@ -1,3 +1,4 @@
 .idea/*
 *.iml
 target/*
+logs/

pom.xml

@@ -24,6 +24,16 @@
             <version>4.12</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.apache.logging.log4j</groupId>
+            <artifactId>log4j-api</artifactId>
+            <version>2.17.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.logging.log4j</groupId>
+            <artifactId>log4j-core</artifactId>
+            <version>2.17.1</version>
+        </dependency>
     </dependencies>
     <build>
         <plugins>

src/main/java/mate/academy/Main.java

@@ -6,15 +6,19 @@
 import mate.academy.service.AuthenticationServiceImpl;
 import mate.academy.service.OrderService;
 import mate.academy.service.OrderServiceImpl;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
 
 public class Main {
+    private static final Logger logger = LogManager.getLogger(Main.class);
+
     public static void main(String[] args) {
         AuthenticationService authenticationService = new AuthenticationServiceImpl();
         User user;
         try {
             user = authenticationService.login("bob", "1234");
         } catch (AuthenticationException e) {
-            e.printStackTrace();
+            logger.error("Помилка операції", e);
             return;
         }
         OrderService orderService = new OrderServiceImpl();

src/main/java/mate/academy/service/AuthenticationServiceImpl.java

@@ -2,11 +2,15 @@
 
 import mate.academy.exception.AuthenticationException;
 import mate.academy.model.User;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
 
 public class AuthenticationServiceImpl implements AuthenticationService {
+    private static final Logger logger = LogManager.getLogger(AuthenticationServiceImpl.class);
+
     @Override
     public User login(String login, String password) throws AuthenticationException {
-        //TODO: add corresponding log message about method login was called
+        logger.info("Method login was called. Params: login={}", login);
         User user = findByLogin(login);
         if (!user.getPassword().equals(password)) {
             throw new AuthenticationException("Username or password are incorrect");

src/main/java/mate/academy/service/OrderServiceImpl.java

@@ -4,11 +4,15 @@
 import java.util.List;
 import mate.academy.model.Order;
 import mate.academy.model.Product;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
 
 public class OrderServiceImpl implements OrderService {
+    private static final Logger logger = LogManager.getLogger(OrderServiceImpl.class);
+
     @Override
     public Order completeOrder(Long userId) {
-        // TODO: add log message about method completeOrder was called
+        logger.info("Method completeOrder was called. Params: userId={}", userId);
         List<Product> products = getAllProductsFromShoppingCart(userId);
         Order order = new Order(products, userId);
         // NOTE: In production ready code this order identifier should be generated by DB
@@ -24,7 +28,7 @@ private List<Product> getAllProductsFromShoppingCart(Long userId) {
         Product macBook = new Product("MacBook Air 2020", BigDecimal.valueOf(1399));
         Product xiaomi = new Product("Xiaomi 12", BigDecimal.valueOf(499));
         List<Product> products = List.of(iphone, macBook, xiaomi);
-        // TODO: add log message about successful fetched data from DB
+        logger.info("Data was successfully fetched from DataBase for userId={}", userId);
         return products;
     }
 }

src/main/resources/log4j.xml

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
+<log4j:configuration>
+
+    <appender name="console" class="org.apache.log4j.ConsoleAppender">
+        <layout class="org.apache.log4j.PatternLayout">
+            <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n"/>
+        </layout>
+    </appender>
+
+    <appender name="file" class="org.apache.log4j.RollingFileAppender">
+        <param name="file" value="logs/app.log"/>
+        <param name="maxFileSize" value="10MB"/>
+        <param name="maxBackupIndex" value="5"/>
+        <layout class="org.apache.log4j.PatternLayout">
+            <param name="ConversionPattern" value="%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n"/>
+        </layout>
+    </appender>
+
+    <root>
+        <level value="INFO"/>
+        <appender-ref ref="console"/>
+        <appender-ref ref="file"/>
+    </root>
+
+</log4j:configuration>