configure the logger, edit the .gitignore file

.gitignore

@@ -1,3 +1,5 @@
 .idea/*
 *.iml
 target/*
+*.logs
+app.log

pom.xml

@@ -8,6 +8,13 @@
     <artifactId>jv-logger</artifactId>
     <version>1.0-SNAPSHOT</version>
 
+    <repositories>
+        <repository>
+            <id>central</id>
+            <url>https://repo1.maven.org/maven2/</url>
+        </repository>
+    </repositories>
+
     <properties>
         <jdk.version>17</jdk.version>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
@@ -24,6 +31,16 @@
             <version>4.12</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.apache.logging.log4j</groupId>
+            <artifactId>log4j-api</artifactId>
+            <version>2.23.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.logging.log4j</groupId>
+            <artifactId>log4j-core</artifactId>
+            <version>2.23.1</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("Can't login", 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

@@ -4,16 +4,21 @@
 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
         List<Product> products = getAllProductsFromShoppingCart(userId);
         Order order = new Order(products, userId);
         // NOTE: In production ready code this order identifier should be generated by DB
         // For test purpose we simplify this and return dummy data
         order.setOrderId(1L);
+        logger.info("Method completeOrder was called. Params: userId={}, products={}, "
+                + "orderId={}", userId, products.size(), order.getOrderId());
         return order;
     }
 
@@ -24,7 +29,8 @@ 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("Successful fetched data. Params: userId={}, products={}",
+                userId, products);
         return products;
     }
 }

src/main/resources/log4j2.xml

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<Configuration status="WARN">
+    <Appenders>
+        <Console name="LogToConsole" target="SYSTEM_OUT">
+            <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger - %msg%n"/>
+        </Console>
+        <File name="LogToFile" fileName="logs/app.log">
+            <PatternLayout>
+                <Pattern>%d %p %c:%L %m%n</Pattern>
+            </PatternLayout>
+        </File>
+    </Appenders>
+    <Loggers>
+        <Logger name="mate.academy" level="info" additivity="false">
+            <AppenderRef ref="LogToConsole"/>
+            <AppenderRef ref="LogToFile"/>
+        </Logger>
+        <Root level="error">
+            <AppenderRef ref="LogToConsole"/>
+            <AppenderRef ref="LogToFile"/>
+        </Root>
+    </Loggers>
+</Configuration>