Merge pull request #11468 from chaos2418/JAVA-8405

JAVA-8405: reducing logging for tutorials-build-job

apache-olingo/olingo2/src/test/resources/logback-test.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

apache-shiro/src/test/resources/logback-test.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

core-java-modules/core-java-lambdas/src/main/java/com/baeldung/java8/lambda/exceptions/LambdaExceptionWrappers.java

@@ -1,15 +1,20 @@
 package com.baeldung.java8.lambda.exceptions;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 import java.util.function.Consumer;
 
 public class LambdaExceptionWrappers {
 
+    private static final Logger LOGGER = LoggerFactory.getLogger(LambdaExceptionWrappers.class);
+
     public static Consumer<Integer> lambdaWrapper(Consumer<Integer> consumer) {
         return i -> {
             try {
                 consumer.accept(i);
             } catch (ArithmeticException e) {
-                System.err.println("Arithmetic Exception occured : " + e.getMessage());
+                LOGGER.error("Arithmetic Exception occurred.", e);
             }
         };
     }
@@ -21,7 +26,7 @@ public class LambdaExceptionWrappers {
             } catch (Exception ex) {
                 try {
                     E exCast = clazz.cast(ex);
-                    System.err.println("Exception occured : " + exCast.getMessage());
+                    LOGGER.error("Exception occurred.", exCast);
                 } catch (ClassCastException ccEx) {
                     throw ex;
                 }
@@ -46,7 +51,7 @@ public class LambdaExceptionWrappers {
             } catch (Exception ex) {
                 try {
                     E exCast = exceptionClass.cast(ex);
-                    System.err.println("Exception occured : " + exCast.getMessage());
+                    LOGGER.error("Exception occurred.", exCast);
                 } catch (ClassCastException ccEx) {
                     throw new RuntimeException(ex);
                 }

core-java-modules/core-java-lambdas/src/test/java/com/baeldung/java8/lambda/methodreference/MethodReferenceUnitTest.java

@@ -7,14 +7,16 @@ import java.util.function.BiFunction;
 
 import org.apache.commons.lang3.StringUtils;
 import org.junit.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 public class MethodReferenceUnitTest {
 
+    private static final Logger LOGGER = LoggerFactory.getLogger(MethodReferenceUnitTest.class);
+
     private static <T> void doNothingAtAll(Object... o) {
     }
 
-    ;
-    
     @Test
     public void referenceToStaticMethod() {
         List<String> messages = Arrays.asList("Hello", "Baeldung", "readers!");
@@ -61,7 +63,7 @@ public class MethodReferenceUnitTest {
 
     @Test
     public void limitationsAndAdditionalExamples() {
-        createBicyclesList().forEach(b -> System.out.printf("Bike brand is '%s' and frame size is '%d'%n", b.getBrand(), b.getFrameSize()));
+        createBicyclesList().forEach(b -> LOGGER.debug("Bike brand is '{}' and frame size is '{}'", b.getBrand(), b.getFrameSize()));
         createBicyclesList().forEach((o) -> MethodReferenceUnitTest.doNothingAtAll(o));
     }
 

core-java-modules/core-java-lang-syntax/src/main/java/com/baeldung/generics/Building.java

@@ -7,6 +7,6 @@ public class Building {
     private static final Logger LOGGER = LoggerFactory.getLogger(Building.class);
 
     public void paint() {
-        LOGGER.info("Painting Building");
+        LOGGER.debug("Painting Building");
     }
 }

core-java-modules/core-java-lang-syntax/src/main/java/com/baeldung/generics/House.java

@@ -7,6 +7,6 @@ public class House extends Building {
     private static final Logger LOGGER = LoggerFactory.getLogger(House.class);
 
     public void paint() {
-        LOGGER.info("Painting House");
+        LOGGER.debug("Painting House");
     }
 }

core-java-modules/core-java-lang-syntax/src/main/java/com/baeldung/initializationguide/User.java

@@ -1,8 +1,13 @@
 package com.baeldung.initializationguide;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 import java.io.Serializable;
 
 public class User implements Serializable, Cloneable {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(User.class);
     private static final long serialVersionUID = 1L;
     static String forum;
     private String name;
@@ -10,12 +15,12 @@ public class User implements Serializable, Cloneable {
 
     {
         id = 0;
-        System.out.println("Instance Initializer");
+        LOGGER.debug("Instance Initializer");
     }
 
     static {
         forum = "Java";
-        System.out.println("Static Initializer");
+        LOGGER.debug("Static Initializer");
     }
 
     public User(String name, int id) {
@@ -25,7 +30,7 @@ public class User implements Serializable, Cloneable {
     }
 
     public User() {
-        System.out.println("Constructor");
+        LOGGER.debug("Constructor");
     }
 
     public String getName() {

core-java-modules/core-java-lang-syntax/src/main/java/com/baeldung/loops/LoopsInJava.java

@@ -1,12 +1,17 @@
 package com.baeldung.loops;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 public class LoopsInJava {
 
+    private static final Logger LOGGER = LoggerFactory.getLogger(LoopsInJava.class);
+    
     public int[] simple_for_loop() {
         int[] arr = new int[5];
         for (int i = 0; i < 5; i++) {
             arr[i] = i;
-            System.out.println("Simple for loop: i - " + i);
+            LOGGER.debug("Simple for loop: i - " + i);
         }
         return arr;
     }
@@ -16,7 +21,7 @@ public class LoopsInJava {
         int[] arr = new int[5];
         for (int num : intArr) {
             arr[num] = num;
-            System.out.println("Enhanced for-each loop: i - " + num);
+            LOGGER.debug("Enhanced for-each loop: i - " + num);
         }
         return arr;
     }
@@ -26,7 +31,7 @@ public class LoopsInJava {
         int[] arr = new int[5];
         while (i < 5) {
             arr[i] = i;
-            System.out.println("While loop: i - " + i++);
+            LOGGER.debug("While loop: i - " + i++);
         }
         return arr;
     }
@@ -36,7 +41,7 @@ public class LoopsInJava {
         int[] arr = new int[5];
         do {
             arr[i] = i;
-            System.out.println("Do-While loop: i - " + i++);
+            LOGGER.debug("Do-While loop: i - " + i++);
         } while (i < 5);
         return arr;
     }

core-java-modules/core-java-lang-syntax/src/main/java/com/baeldung/switchstatement/SwitchStatement.java

@@ -1,7 +1,13 @@
 package com.baeldung.switchstatement;
 
+import com.baeldung.loops.LoopsInJava;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 public class SwitchStatement {
 
+    private static final Logger LOGGER = LoggerFactory.getLogger(SwitchStatement.class);
+
     public String exampleOfIF(String animal) {
 
         String result;
@@ -42,11 +48,11 @@ public class SwitchStatement {
         switch (animal) {
 
         case "DOG":
-            System.out.println("domestic animal");
+            LOGGER.debug("domestic animal");
             result = "domestic animal";
 
         default:
-            System.out.println("unknown animal");
+            LOGGER.debug("unknown animal");
             result = "unknown animal";
 
         }

core-java-modules/core-java-lang-syntax/src/test/java/com/baeldung/loops/LoopsUnitTest.java

@@ -8,12 +8,16 @@ import java.util.Map;
 import java.util.Map.Entry;
 import java.util.Set;
 
+import com.baeldung.initializationguide.User;
 import org.junit.Assert;
 import org.junit.BeforeClass;
 import org.junit.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 public class LoopsUnitTest {
 
+    private static final Logger LOGGER = LoggerFactory.getLogger(LoopsUnitTest.class);
     private LoopsInJava loops = new LoopsInJava();
     private static List<String> list = new ArrayList<>();
     private static Set<String> set = new HashSet<>();
@@ -65,41 +69,44 @@ public class LoopsUnitTest {
     @Test
     public void whenUsingSimpleFor_shouldIterateList() {
         for (int i = 0; i < list.size(); i++) {
-            System.out.println(list.get(i));
+            LOGGER.debug(list.get(i));
         }
     }
 
     @Test
     public void whenUsingEnhancedFor_shouldIterateList() {
         for (String item : list) {
-            System.out.println(item);
+            LOGGER.debug(item);
         }
     }
 
     @Test
     public void whenUsingEnhancedFor_shouldIterateSet() {
         for (String item : set) {
-            System.out.println(item);
+            LOGGER.debug(item);
         }
     }
 
     @Test
     public void whenUsingEnhancedFor_shouldIterateMap() {
         for (Entry<String, Integer> entry : map.entrySet()) {
-            System.out.println("Key: " + entry.getKey() + " - " + "Value: " + entry.getValue());
+            LOGGER.debug("Key: " + entry.getKey() + " - " + "Value: " + entry.getValue());
         }
     }
 
     @Test
     public void whenUsingSimpleFor_shouldRunLabelledLoop() {
-        aa: for (int i = 1; i <= 3; i++) {
+        aa:
-            if (i == 1)
+        for (int i = 1; i <= 3; i++) {
+            if (i == 1) {
                 continue;
-            bb: for (int j = 1; j <= 3; j++) {
+            }
+            bb:
+            for (int j = 1; j <= 3; j++) {
                 if (i == 2 && j == 2) {
                     break aa;
                 }
-                System.out.println(i + " " + j);
+                LOGGER.debug(i + " " + j);
             }
         }
     }

jta/src/test/resources/logback-test.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

kubernetes/k8s-admission-controller/src/test/resources/logback-test.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

libraries-3/src/test/resources/logback-test.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

libraries-security/src/test/resources/logback-test.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

logback-config.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

persistence-modules/hibernate-exceptions/src/main/java/com/baeldung/hibernate/exception/lazyinitialization/HibernateUtil.java

@@ -24,7 +24,7 @@ public class HibernateUtil {
                 settings.put(Environment.USER, "sa");
                 settings.put(Environment.PASS, "");
                 settings.put(Environment.DIALECT, "org.hibernate.dialect.HSQLDialect");
-                settings.put(Environment.SHOW_SQL, "true");
+                settings.put(Environment.SHOW_SQL, "false");
                 settings.put(Environment.HBM2DDL_AUTO, "update");
                 configuration.setProperties(settings);
                 configuration.addAnnotatedClass(User.class);

persistence-modules/hibernate-exceptions/src/main/java/com/baeldung/hibernate/exception/transientobject/HibernateUtil.java

@@ -27,7 +27,7 @@ public class HibernateUtil {
                 settings.put(Environment.USER, "sa");
                 settings.put(Environment.PASS, "");
                 settings.put(Environment.DIALECT, "org.hibernate.dialect.HSQLDialect");
-                settings.put(Environment.SHOW_SQL, "true");
+                settings.put(Environment.SHOW_SQL, "false");
                 settings.put(Environment.USE_SQL_COMMENTS, "true");
                 settings.put(Environment.HBM2DDL_AUTO, "update");
                 configuration.setProperties(settings);

persistence-modules/hibernate5/src/main/java/com/baeldung/hibernate/interceptors/CustomInterceptor.java

@@ -16,7 +16,7 @@ public class CustomInterceptor extends EmptyInterceptor {
     @Override
     public boolean onSave(Object entity, Serializable id, Object[] state, String[] propertyNames, Type[] types) {
         if (entity instanceof User) {
-            logger.info(((User) entity).toString());
+            logger.debug(entity.toString());
         }
         return super.onSave(entity, id, state, propertyNames, types);
     }
@@ -25,7 +25,7 @@ public class CustomInterceptor extends EmptyInterceptor {
     public boolean onFlushDirty(Object entity, Serializable id, Object[] currentState, Object [] previousState, String[] propertyNames, Type[] types) {
         if (entity instanceof User) {
             ((User) entity).setLastModified(new Date());
-            logger.info(((User) entity).toString());
+            logger.debug(entity.toString());
         }
         return super.onFlushDirty(entity, id, currentState, previousState, propertyNames, types);
     }

persistence-modules/hibernate5/src/main/java/com/baeldung/hibernate/interceptors/entity/User.java

@@ -1,7 +1,5 @@
 package com.baeldung.hibernate.interceptors.entity;
 
-import java.util.Date;
-
 import javax.persistence.Basic;
 import javax.persistence.Entity;
 import javax.persistence.GeneratedValue;
@@ -9,6 +7,7 @@ import javax.persistence.GenerationType;
 import javax.persistence.Id;
 import javax.persistence.Temporal;
 import javax.persistence.TemporalType;
+import java.util.Date;
 
 @Entity(name = "hbi_user")
 public class User {

persistence-modules/hibernate5/src/test/java/com/baeldung/hibernate/hilo/HibernateHiloUnitTest.java

@@ -42,9 +42,9 @@ public class HibernateHiloUnitTest {
     private void configureLogger() {
         BasicConfigurator.configure();
         LogManager.getLogger("org.hibernate").setLevel(Level.ERROR);
-        LogManager.getLogger("org.hibernate.id.enhanced.SequenceStructure").setLevel(Level.DEBUG);
+        LogManager.getLogger("org.hibernate.id.enhanced.SequenceStructure").setLevel(Level.INFO);
-        LogManager.getLogger("org.hibernate.event.internal.AbstractSaveEventListener").setLevel(Level.DEBUG);
+        LogManager.getLogger("org.hibernate.event.internal.AbstractSaveEventListener").setLevel(Level.INFO);
-        LogManager.getLogger("org.hibernate.SQL").setLevel(Level.DEBUG);
+        LogManager.getLogger("org.hibernate.SQL").setLevel(Level.INFO);
     }
 
 

persistence-modules/hibernate5/src/test/java/com/baeldung/hibernate/proxy/HibernateProxyUnitTest.java

@@ -1,5 +1,8 @@
 package com.baeldung.hibernate.proxy;
 
+import org.apache.log4j.BasicConfigurator;
+import org.apache.log4j.Level;
+import org.apache.log4j.LogManager;
 import org.hibernate.*;
 import org.hibernate.proxy.HibernateProxy;
 import org.junit.After;

persistence-modules/hibernate5/src/test/resources/hibernate-hilo.properties

@@ -2,7 +2,7 @@ hibernate.connection.driver_class=org.h2.Driver
 hibernate.connection.url=jdbc:h2:mem:hilo_db;DB_CLOSE_DELAY=-1
 hibernate.connection.username=sa
 hibernate.dialect=org.hibernate.dialect.H2Dialect
-hibernate.show_sql=true
+hibernate.show_sql=false
 hibernate.hbm2ddl.auto=create-drop
 hibernate.c3p0.min_size=5
 hibernate.c3p0.max_size=20

persistence-modules/hibernate5/src/test/resources/hibernate-interceptors.properties

@@ -5,6 +5,6 @@ hibernate.connection.autocommit=true
 jdbc.password=
 
 hibernate.dialect=org.hibernate.dialect.H2Dialect
-hibernate.show_sql=true
+hibernate.show_sql=false
 hibernate.hbm2ddl.auto=create-drop
 hibernate.current_session_context_class=org.hibernate.context.internal.ThreadLocalSessionContext

persistence-modules/hibernate5/src/test/resources/hibernate-lifecycle.properties

@@ -5,5 +5,5 @@ hibernate.connection.password=
 hibernate.connection.autocommit=true
 
 hibernate.dialect=org.hibernate.dialect.H2Dialect
-hibernate.show_sql=true
+hibernate.show_sql=false
 hibernate.hbm2ddl.auto=validate

persistence-modules/hibernate5/src/test/resources/hibernate-namingstrategy.properties

@@ -3,7 +3,7 @@ hibernate.connection.url=jdbc:h2:mem:mydb1;DB_CLOSE_DELAY=-1
 hibernate.connection.username=sa
 hibernate.dialect=org.hibernate.dialect.H2Dialect
 
-hibernate.show_sql=true
+hibernate.show_sql=false
 hibernate.hbm2ddl.auto=create-drop
 
 hibernate.physical_naming_strategy=com.baeldung.hibernate.namingstrategy.CustomPhysicalNamingStrategy

persistence-modules/hibernate5/src/test/resources/hibernate-persistjson.properties

@@ -3,5 +3,5 @@ hibernate.connection.url=jdbc:h2:mem:mydb1;DB_CLOSE_DELAY=-1
 hibernate.connection.username=sa
 hibernate.dialect=org.hibernate.dialect.H2Dialect
 
-hibernate.show_sql=true
+hibernate.show_sql=false
 hibernate.hbm2ddl.auto=create-drop

persistence-modules/hibernate5/src/test/resources/hibernate.properties

@@ -5,7 +5,7 @@ hibernate.connection.autocommit=true
 jdbc.password=
 
 hibernate.dialect=org.hibernate.dialect.H2Dialect
-hibernate.show_sql=true
+hibernate.show_sql=false
 hibernate.hbm2ddl.auto=create-drop
 
 hibernate.c3p0.min_size=5

persistence-modules/spring-boot-persistence-h2/src/test/resources/logback-test.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

persistence-modules/spring-data-jpa-enterprise/src/main/resources/application.properties

@@ -9,7 +9,7 @@ spring.datasource.url=jdbc:h2:mem:baeldung
 #spring.jpa.properties.javax.persistence.schema-generation.scripts.create-source=metadata
 #spring.jpa.properties.hibernate.format_sql=true
 
-spring.jpa.show-sql=true
+spring.jpa.show-sql=false
 
 #hibernate.dialect=org.hibernate.dialect.H2Dialect
 spring.jpa.properties.hibernate.id.new_generator_mappings=false

persistence-modules/spring-data-jpa-enterprise/src/test/java/com/baeldung/SpringContextTest.java

@@ -3,6 +3,7 @@ package com.baeldung;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.TestPropertySource;
 import org.springframework.test.context.junit4.SpringRunner;
 
 import com.baeldung.boot.Application;

persistence-modules/spring-data-jpa-enterprise/src/test/java/com/baeldung/partialupdate/PartialUpdateUnitTest.java

@@ -7,6 +7,7 @@ import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.TestPropertySource;
 import org.springframework.test.context.junit4.SpringRunner;
 
 import com.baeldung.partialupdate.model.Customer;

persistence-modules/spring-data-jpa-enterprise/src/test/resources/logback-test.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+    <logger name="org.hibernate" level="INFO"/>
+</configuration>

persistence-modules/spring-mybatis/src/test/resources/logback-test.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

persistence-modules/spring-persistence-simple/src/test/resources/logback-test.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

pom.xml

@@ -295,7 +295,6 @@
             <id>default-first</id>
             <build>
                 <plugins>
-
                     <plugin>
                         <groupId>org.apache.maven.plugins</groupId>
                         <artifactId>maven-surefire-plugin</artifactId>
@@ -315,6 +314,9 @@
                                 <exclude>**/JdbcTest.java</exclude>
                                 <exclude>**/*LiveTest.java</exclude>
                             </excludes>
+                            <systemPropertyVariables>
+                                <logback.configurationFile>${tutorialsproject.basedir}/logback-config.xml</logback.configurationFile>
+                            </systemPropertyVariables>
                         </configuration>
                     </plugin>
 
@@ -581,6 +583,9 @@
                                 <exclude>**/*JdbcTest.java</exclude>
                                 <exclude>**/*LiveTest.java</exclude>
                             </excludes>
+                            <systemPropertyVariables>
+                                <logback.configurationFile>${tutorialsproject.basedir}/logback-config.xml</logback.configurationFile>
+                            </systemPropertyVariables>
                         </configuration>
                     </plugin>
 

software-security/sql-injection-samples/src/test/resources/logback-test.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

spring-5-reactive-2/src/test/java/com/baeldung/backpressure/BackpressureUnitTest.java

@@ -1,21 +1,25 @@
 package com.baeldung.backpressure;
 
 import org.junit.jupiter.api.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import reactor.core.publisher.BaseSubscriber;
 import reactor.core.publisher.Flux;
 import reactor.test.StepVerifier;
 
 public class BackpressureUnitTest {
 
+    private static final Logger LOGGER = LoggerFactory.getLogger(BackpressureUnitTest.class);
+    
     @Test
     public void whenLimitRateSet_thenSplitIntoChunks() throws InterruptedException {
         Flux<Integer> limit = Flux.range(1, 25);
 
         limit.limitRate(10);
         limit.subscribe(
-          value -> System.out.println(value),
+          value -> LOGGER.debug(String.valueOf(value)),
           err -> err.printStackTrace(),
-          () -> System.out.println("Finished!!"),
+          () -> LOGGER.debug("Finished!!"),
           subscription -> subscription.request(15)
         );
 
@@ -34,12 +38,12 @@ public class BackpressureUnitTest {
         Flux<Integer> request = Flux.range(1, 50);
 
         request.subscribe(
-          System.out::println,
+          integer -> LOGGER.debug(String.valueOf(integer)),
           err -> err.printStackTrace(),
-          () -> System.out.println("All 50 items have been successfully processed!!!"),
+          () -> LOGGER.debug("All 50 items have been successfully processed!!!"),
           subscription -> {
               for (int i = 0; i < 5; i++) {
-                  System.out.println("Requesting the next 10 elements!!!");
+                  LOGGER.debug("Requesting the next 10 elements!!!");
                   subscription.request(10);
               }
           }
@@ -68,7 +72,7 @@ public class BackpressureUnitTest {
             @Override
             protected void hookOnNext(Integer value) {
                 request(3);
-                System.out.println(value);
+                LOGGER.debug(String.valueOf(value));
                 cancel();
             }
         });

spring-aop/pom.xml

@@ -65,6 +65,15 @@
                     </execution>
                 </executions>
             </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <configuration>
+                    <systemPropertyVariables>
+                        <logback.configurationFile>${project.basedir}/src/main/resources/logback.xml</logback.configurationFile>
+                    </systemPropertyVariables>
+                </configuration>
+            </plugin>
         </plugins>
     </build>
 

spring-boot-modules/spring-boot-1/src/test/resources/logback-test.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

spring-boot-modules/spring-boot-config-jpa-error/data-jpa-application/src/test/resources/logback-test.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

spring-boot-modules/spring-boot-config-jpa-error/data-jpa-library/src/test/resources/logback-test.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

spring-boot-modules/spring-boot-data-2/src/test/resources/logback-test.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

spring-boot-modules/spring-boot-mvc-jersey/spring-boot-jersey/src/test/resources/logback-test.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

spring-boot-modules/spring-boot-mvc-jersey/spring-boot-mvc/src/test/resources/logback-test.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

spring-boot-modules/spring-boot-properties-2/src/test/resources/logback-test.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

spring-boot-modules/spring-boot-properties/src/test/resources/logback-test.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

spring-boot-modules/spring-boot-validation/src/test/resources/logback-test.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

spring-caching/src/main/java/com/baeldung/ehcache/calculator/SquaredCalculator.java

@@ -1,8 +1,12 @@
 package com.baeldung.ehcache.calculator;
 
 import com.baeldung.ehcache.config.CacheHelper;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 public class SquaredCalculator {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(SquaredCalculator.class);
     private CacheHelper cache;
 
     public int getSquareValueOfNumber(int input) {
@@ -10,7 +14,7 @@ public class SquaredCalculator {
             return cache.getSquareNumberCache().get(input);
         }
 
-        System.out.println("Calculating square value of " + input + " and caching result.");
+        LOGGER.debug("Calculating square value of {} and caching result.", input);
 
         int squaredValue = (int) Math.pow(input, 2);
         cache.getSquareNumberCache().put(input, squaredValue);

spring-caching/src/test/java/com/baeldung/ehcache/SquareCalculatorUnitTest.java

@@ -4,13 +4,18 @@ import com.baeldung.ehcache.calculator.SquaredCalculator;
 import com.baeldung.ehcache.config.CacheHelper;
 import org.junit.Before;
 import org.junit.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 
 public class SquareCalculatorUnitTest {
-    private SquaredCalculator squaredCalculator = new SquaredCalculator();
+
-    private CacheHelper cacheHelper = new CacheHelper();
+    private static final Logger LOGGER = LoggerFactory.getLogger(SquareCalculatorUnitTest.class);
+
+    private final SquaredCalculator squaredCalculator = new SquaredCalculator();
+    private final CacheHelper cacheHelper = new CacheHelper();
 
     @Before
     public void setup() {
@@ -21,7 +26,7 @@ public class SquareCalculatorUnitTest {
     public void whenCalculatingSquareValueOnce_thenCacheDontHaveValues() {
         for (int i = 10; i < 15; i++) {
             assertFalse(cacheHelper.getSquareNumberCache().containsKey(i));
-            System.out.println("Square value of " + i + " is: " + squaredCalculator.getSquareValueOfNumber(i) + "\n");
+            LOGGER.debug("Square value of {} is: {}", i, squaredCalculator.getSquareValueOfNumber(i));
         }
     }
 
@@ -29,12 +34,12 @@ public class SquareCalculatorUnitTest {
     public void whenCalculatingSquareValueAgain_thenCacheHasAllValues() {
         for (int i = 10; i < 15; i++) {
             assertFalse(cacheHelper.getSquareNumberCache().containsKey(i));
-            System.out.println("Square value of " + i + " is: " + squaredCalculator.getSquareValueOfNumber(i) + "\n");
+            LOGGER.debug("Square value of {} is: {}", i, squaredCalculator.getSquareValueOfNumber(i));
         }
 
         for (int i = 10; i < 15; i++) {
             assertTrue(cacheHelper.getSquareNumberCache().containsKey(i));
-            System.out.println("Square value of " + i + " is: " + squaredCalculator.getSquareValueOfNumber(i) + "\n");
+            LOGGER.debug("Square value of {} is: {}", i, squaredCalculator.getSquareValueOfNumber(i) + "\n");
         }
     }
 }

spring-cloud/spring-cloud-archaius/additional-sources-simple/src/test/resources/logback-test.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

spring-cloud/spring-cloud-archaius/basic-config/src/test/resources/logback-test.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

spring-cloud/spring-cloud-archaius/extra-configs/src/test/resources/logback-test.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

spring-cloud/spring-cloud-archaius/jdbc-config/src/test/resources/logback-test.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

spring-cloud/spring-cloud-functions/src/test/resources/logback-test.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

spring-cloud/spring-cloud-kubernetes/kubernetes-selfhealing/liveness-example/src/test/resources/logback-test.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

spring-cloud/spring-cloud-kubernetes/kubernetes-selfhealing/readiness-example/src/test/resources/logback-test.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

spring-core-5/src/test/resources/logback-test.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

spring-di-2/src/test/resources/logback-test.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

spring-security-modules/spring-5-security/src/test/resources/logback-test.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

spring-security-modules/spring-security-oidc/src/test/resources/logback-test.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

spring-security-modules/spring-security-web-boot-3/src/test/resources/logback-test.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

spring-web-modules/spring-boot-jsp/src/test/resources/logback-test.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

spring-web-modules/spring-mvc-basics/src/test/resources/logback-test.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

spring-web-modules/spring-mvc-java-2/src/test/resources/logback-test.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

spring-web-modules/spring-rest-http/src/test/resources/logback-test.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

spring-web-modules/spring-resttemplate-2/src/test/resources/logback-test.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

spring-web-modules/spring-thymeleaf-2/src/test/resources/logback-test.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration scan="true" scanPeriod="15 seconds" debug="false">
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>[%d{ISO8601}]-[%thread] %-5level %logger - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

testing-modules/junit-5-basics/src/test/java/com/baeldung/migration/junit4/BeforeAndAfterAnnotationsUnitTest.java

@@ -23,19 +23,19 @@ public class BeforeAndAfterAnnotationsUnitTest {
 
     @Before
     public void init() {
-        LOG.info("startup");
+        LOG.debug("startup");
         list = new ArrayList<>(Arrays.asList("test1", "test2"));
     }
 
     @After
     public void teardown() {
-        LOG.info("teardown");
+        LOG.debug("teardown");
         list.clear();
     }
 
     @Test
     public void whenCheckingListSize_thenSizeEqualsToInit() {
-        LOG.info("executing test");
+        LOG.debug("executing test");
         assertEquals(2, list.size());
 
         list.add("another test");
@@ -43,7 +43,7 @@ public class BeforeAndAfterAnnotationsUnitTest {
 
     @Test
     public void whenCheckingListSizeAgain_thenSizeEqualsToInit() {
-        LOG.info("executing another test");
+        LOG.debug("executing another test");
         assertEquals(2, list.size());
 
         list.add("yet another test");

testing-modules/junit-5-basics/src/test/java/com/baeldung/migration/junit4/BeforeClassAndAfterClassAnnotationsUnitTest.java

@@ -15,21 +15,21 @@ public class BeforeClassAndAfterClassAnnotationsUnitTest {
 
     @BeforeClass
     public static void setup() {
-        LOG.info("startup - creating DB connection");
+        LOG.debug("startup - creating DB connection");
     }
 
     @AfterClass
     public static void tearDown() {
-        LOG.info("closing DB connection");
+        LOG.debug("closing DB connection");
     }
 
     @Test
     public void simpleTest() {
-        LOG.info("simple test");
+        LOG.debug("simple test");
     }
 
     @Test
     public void anotherSimpleTest() {
-        LOG.info("another simple test");
+        LOG.debug("another simple test");
     }
 }

testing-modules/junit-5-basics/src/test/java/com/baeldung/migration/junit4/RuleExampleUnitTest.java

@@ -1,18 +1,21 @@
 package com.baeldung.migration.junit4;
 
+import com.baeldung.migration.junit4.rules.TraceUnitTestRule;
 import org.junit.Rule;
 import org.junit.Test;
-
+import org.slf4j.Logger;
-import com.baeldung.migration.junit4.rules.TraceUnitTestRule;
+import org.slf4j.LoggerFactory;
 
 public class RuleExampleUnitTest {
     
+    private static final Logger LOGGER = LoggerFactory.getLogger(RuleExampleUnitTest.class);
+    
     @Rule
     public final TraceUnitTestRule traceRuleTests = new TraceUnitTestRule();
 
     @Test
     public void whenTracingTests() {
-        System.out.println("This is my test");
+        LOGGER.debug("This is my test");
         /*...*/
     }
 }

testing-modules/junit-5-basics/src/test/java/com/baeldung/migration/junit4/rules/TraceUnitTestRule.java

@@ -1,15 +1,19 @@
 package com.baeldung.migration.junit4.rules;
 
-import java.util.ArrayList;
-import java.util.List;
-
 import org.junit.rules.TestRule;
 import org.junit.runner.Description;
 import org.junit.runners.model.MultipleFailureException;
 import org.junit.runners.model.Statement;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.ArrayList;
+import java.util.List;
 
 public class TraceUnitTestRule implements TestRule {
 
+    private static final Logger LOGGER = LoggerFactory.getLogger(TraceUnitTestRule.class);
+
     @Override
     public Statement apply(Statement base, Description description) {
 
@@ -18,13 +22,13 @@ public class TraceUnitTestRule implements TestRule {
             public void evaluate() throws Throwable {
                 List<Throwable> errors = new ArrayList<Throwable>();
 
-                System.out.println("Starting test ... " + description.getMethodName());
+                LOGGER.debug("Starting test ... {}", description.getMethodName());
                 try {
                     base.evaluate();
                 } catch (Throwable e) {
                     errors.add(e);
                 } finally {
-                    System.out.println("... test finished. " + description.getMethodName());
+                    LOGGER.debug("... test finished. {}", description.getMethodName());
                 }
 
                 MultipleFailureException.assertEmpty(errors);

testing-modules/junit-5-basics/src/test/java/com/baeldung/migration/junit5/BeforeAllAndAfterAllAnnotationsUnitTest.java

@@ -15,21 +15,21 @@ public class BeforeAllAndAfterAllAnnotationsUnitTest {
     
     @BeforeAll
     public static void setup() {
-        LOG.info("startup - creating DB connection");
+        LOG.debug("startup - creating DB connection");
     }
 
     @AfterAll
     public static void tearDown() {
-        LOG.info("closing DB connection");
+        LOG.debug("closing DB connection");
     }
 
     @Test
     public void simpleTest() {
-        LOG.info("simple test");
+        LOG.debug("simple test");
     }
 
     @Test
     public void anotherSimpleTest() {
-        LOG.info("another simple test");
+        LOG.debug("another simple test");
     }
 }

testing-modules/junit-5-basics/src/test/java/com/baeldung/migration/junit5/BeforeEachAndAfterEachAnnotationsUnitTest.java

@@ -23,19 +23,19 @@ public class BeforeEachAndAfterEachAnnotationsUnitTest {
     
     @BeforeEach 
     public void init() {
-        LOG.info("startup");
+        LOG.debug("startup");
         list = new ArrayList<>(Arrays.asList("test1", "test2"));
     }
 
     @AfterEach
     public void teardown() {
-        LOG.info("teardown");
+        LOG.debug("teardown");
         list.clear();
     }
 
     @Test
     public void whenCheckingListSize_ThenSizeEqualsToInit() {
-        LOG.info("executing test");
+        LOG.debug("executing test");
         assertEquals(2, list.size());
 
         list.add("another test");
@@ -43,7 +43,7 @@ public class BeforeEachAndAfterEachAnnotationsUnitTest {
 
     @Test
     public void whenCheckingListSizeAgain_ThenSizeEqualsToInit() {
-        LOG.info("executing another test");
+        LOG.debug("executing another test");
         assertEquals(2, list.size());
 
         list.add("yet another test");

testing-modules/junit-5-basics/src/test/java/com/baeldung/migration/junit5/RuleExampleUnitTest.java

@@ -1,19 +1,22 @@
 package com.baeldung.migration.junit5;
 
+import com.baeldung.migration.junit5.extensions.TraceUnitExtension;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 import org.junit.platform.runner.JUnitPlatform;
 import org.junit.runner.RunWith;
-
+import org.slf4j.Logger;
-import com.baeldung.migration.junit5.extensions.TraceUnitExtension;
+import org.slf4j.LoggerFactory;
 
 @RunWith(JUnitPlatform.class)
 @ExtendWith(TraceUnitExtension.class)
 public class RuleExampleUnitTest {
 
+    private static final Logger LOGGER = LoggerFactory.getLogger(RuleExampleUnitTest.class);
+    
     @Test
     public void whenTracingTests() {
-        System.out.println("This is my test");
+       LOGGER.debug("This is my test");
         /*...*/
     }
 }

testing-modules/junit-5-basics/src/test/java/com/baeldung/migration/junit5/extensions/TraceUnitExtension.java

@@ -3,17 +3,21 @@ package com.baeldung.migration.junit5.extensions;
 import org.junit.jupiter.api.extension.AfterEachCallback;
 import org.junit.jupiter.api.extension.BeforeEachCallback;
 import org.junit.jupiter.api.extension.ExtensionContext;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 public class TraceUnitExtension implements AfterEachCallback, BeforeEachCallback {
 
+    private static final Logger LOGGER = LoggerFactory.getLogger(TraceUnitExtension.class);
+
     @Override
     public void beforeEach(ExtensionContext context) throws Exception {
-        System.out.println("Starting test ... " + context.getDisplayName());
+        LOGGER.debug("Starting test ... {}", context.getDisplayName());
     }
 
     @Override
     public void afterEach(ExtensionContext context) throws Exception {
-        System.out.println("... test finished. " + context.getDisplayName());
+        LOGGER.debug("... test finished. {}", context.getDisplayName());
     }
 
 }

testing-modules/junit-5-basics/src/test/java/com/baeldung/resourcedirectory/ReadResourceDirectoryUnitTest.java

@@ -1,7 +1,10 @@
 package com.baeldung.resourcedirectory;
 
+import com.baeldung.migration.junit5.extensions.TraceUnitExtension;
 import org.junit.Assert;
 import org.junit.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.File;
 import java.nio.file.Path;
@@ -9,6 +12,8 @@ import java.nio.file.Paths;
 
 public class ReadResourceDirectoryUnitTest {
 
+    private static final Logger LOGGER = LoggerFactory.getLogger(TraceUnitExtension.class);
+    
     @Test
     public void givenResourcePath_whenReadAbsolutePathWithFile_thenAbsolutePathEndsWithDirectory() {
         String path = "src/test/resources";
@@ -16,7 +21,7 @@ public class ReadResourceDirectoryUnitTest {
         File file = new File(path);
         String absolutePath = file.getAbsolutePath();
 
-        System.out.println(absolutePath);
+        LOGGER.debug(absolutePath);
         Assert.assertTrue(absolutePath.endsWith("src" + File.separator + "test" + File.separator + "resources"));
     }
 
@@ -26,7 +31,7 @@ public class ReadResourceDirectoryUnitTest {
 
         String absolutePath = resourceDirectory.toFile().getAbsolutePath();
 
-        System.out.println(absolutePath);
+        LOGGER.debug(absolutePath);
         Assert.assertTrue(absolutePath.endsWith("src" + File.separator + "test" + File.separator + "resources"));
     }
 
@@ -38,7 +43,7 @@ public class ReadResourceDirectoryUnitTest {
         File file = new File(classLoader.getResource(resourceName).getFile());
         String absolutePath = file.getAbsolutePath();
 
-        System.out.println(absolutePath);
+        LOGGER.debug(absolutePath);
         Assert.assertTrue(absolutePath.endsWith(File.separator + "example_resource.txt"));
     }
 

testing-modules/junit5-annotations/src/main/java/com/baeldung/junit5/registerextension/RegisterExtensionSampleExtension.java

@@ -20,12 +20,12 @@ public class RegisterExtensionSampleExtension implements BeforeAllCallback, Befo
 
     @Override
     public void beforeAll(ExtensionContext extensionContext) throws Exception {
-        logger.info("Type {} In beforeAll : {}", type, extensionContext.getDisplayName());
+        logger.debug("Type {} In beforeAll : {}", type, extensionContext.getDisplayName());
     }
 
     @Override
     public void beforeEach(ExtensionContext extensionContext) throws Exception {
-        logger.info("Type {} In beforeEach : {}", type, extensionContext.getDisplayName());
+        logger.debug("Type {} In beforeEach : {}", type, extensionContext.getDisplayName());
     }
 
     public String getType() {

testing-modules/junit5-annotations/src/test/java/com/baeldung/junit5/RepeatedTestAnnotationUnitTest.java

@@ -1,41 +1,45 @@
 package com.baeldung.junit5;
 
-import static org.junit.jupiter.api.Assertions.assertEquals;
-
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.RepeatedTest;
 import org.junit.jupiter.api.RepetitionInfo;
 import org.junit.jupiter.api.TestInfo;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
 
 public class RepeatedTestAnnotationUnitTest {
 
+    private static final Logger LOGGER = LoggerFactory.getLogger(RepeatedTestAnnotationUnitTest.class);
+
     @BeforeEach
     void beforeEachTest() {
-        System.out.println("Before Each Test");
+        LOGGER.debug("Before Each Test");
     }
 
     @AfterEach
     void afterEachTest() {
-        System.out.println("After Each Test");
+        LOGGER.debug("After Each Test");
-        System.out.println("=====================");
+        LOGGER.debug("=====================");
     }
 
     @RepeatedTest(3)
     void repeatedTest(TestInfo testInfo) {
-        System.out.println("Executing repeated test");
+        LOGGER.debug("Executing repeated test");
         assertEquals(2, Math.addExact(1, 1), "1 + 1 should equal 2");
     }
 
     @RepeatedTest(value = 3, name = RepeatedTest.LONG_DISPLAY_NAME)
     void repeatedTestWithLongName() {
-        System.out.println("Executing repeated test with long name");
+        LOGGER.debug("Executing repeated test with long name");
         assertEquals(2, Math.addExact(1, 1), "1 + 1 should equal 2");
     }
 
     @RepeatedTest(value = 3, name = RepeatedTest.SHORT_DISPLAY_NAME)
     void repeatedTestWithShortName() {
-        System.out.println("Executing repeated test with long name");
+        LOGGER.debug("Executing repeated test with long name");
         assertEquals(2, Math.addExact(1, 1), "1 + 1 should equal 2");
     }
 
@@ -46,7 +50,7 @@ public class RepeatedTestAnnotationUnitTest {
 
     @RepeatedTest(3)
     void repeatedTestWithRepetitionInfo(RepetitionInfo repetitionInfo) {
-        System.out.println("Repetition #" + repetitionInfo.getCurrentRepetition());
+        LOGGER.debug("Repetition # {}", repetitionInfo.getCurrentRepetition());
         assertEquals(3, repetitionInfo.getTotalRepetitions());
     }
 }

testing-modules/junit5-annotations/src/test/java/com/baeldung/junit5/conditional/ConditionalAnnotationsUnitTest.java

@@ -2,7 +2,20 @@ package com.baeldung.junit5.conditional;
 
 import org.junit.jupiter.api.RepeatedTest;
 import org.junit.jupiter.api.Test;
-import org.junit.jupiter.api.condition.*;
+import org.junit.jupiter.api.condition.DisabledForJreRange;
+import org.junit.jupiter.api.condition.DisabledIfEnvironmentVariable;
+import org.junit.jupiter.api.condition.DisabledIfSystemProperty;
+import org.junit.jupiter.api.condition.DisabledOnJre;
+import org.junit.jupiter.api.condition.DisabledOnOs;
+import org.junit.jupiter.api.condition.EnabledForJreRange;
+import org.junit.jupiter.api.condition.EnabledIfEnvironmentVariable;
+import org.junit.jupiter.api.condition.EnabledIfSystemProperty;
+import org.junit.jupiter.api.condition.EnabledOnJre;
+import org.junit.jupiter.api.condition.EnabledOnOs;
+import org.junit.jupiter.api.condition.JRE;
+import org.junit.jupiter.api.condition.OS;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.lang.annotation.ElementType;
 import java.lang.annotation.Retention;
@@ -11,64 +24,66 @@ import java.lang.annotation.Target;
 
 public class ConditionalAnnotationsUnitTest {
 
+    private static final Logger LOGGER = LoggerFactory.getLogger(ConditionalAnnotationsUnitTest.class);
+    
     @Test
     @EnabledOnOs({OS.WINDOWS, OS.MAC})
     public void shouldRunBothWindowsAndMac() {
-        System.out.println("runs on Windows and Mac");
+        LOGGER.debug("runs on Windows and Mac");
     }
 
     @Test
     @DisabledOnOs(OS.LINUX)
     public void shouldNotRunAtLinux() {
-        System.out.println("will not run on Linux");
+        LOGGER.debug("will not run on Linux");
     }
 
     @Test
     @EnabledOnJre({JRE.JAVA_10, JRE.JAVA_11})
     public void shouldOnlyRunOnJava10And11() {
-        System.out.println("runs with java 10 and 11");
+        LOGGER.debug("runs with java 10 and 11");
     }
 
     @Test
     @EnabledForJreRange(min = JRE.JAVA_8, max = JRE.JAVA_13)
     public void shouldOnlyRunOnJava8UntilJava13() {
-        System.out.println("runs with Java 8, 9, 10, 11, 12 and 13!");
+        LOGGER.debug("runs with Java 8, 9, 10, 11, 12 and 13!");
     }
 
     @Test
     @DisabledForJreRange(min = JRE.JAVA_14, max = JRE.JAVA_15)
     public void shouldNotBeRunOnJava14AndJava15() {
-        System.out.println("Shouldn't be run on Java 14 and 15.");
+        LOGGER.debug("Shouldn't be run on Java 14 and 15.");
     }
 
     @Test
     @DisabledOnJre(JRE.OTHER)
     public void thisTestOnlyRunsWithUpToDateJREs() {
-        System.out.println("this test will only run on java8, 9, 10 and 11.");
+        LOGGER.debug("this test will only run on java8, 9, 10 and 11.");
     }
 
     @Test
     @EnabledIfSystemProperty(named = "java.vm.vendor", matches = "Oracle.*")
     public void onlyIfVendorNameStartsWithOracle() {
-        System.out.println("runs only if vendor name starts with Oracle");
+        LOGGER.debug("runs only if vendor name starts with Oracle");
     }
 
     @Test
     @DisabledIfSystemProperty(named = "file.separator", matches = "[/]")
     public void disabledIfFileSeperatorIsSlash() {
-        System.out.println("Will not run if file.sepeartor property is /");
+        LOGGER.debug("Will not run if file.sepeartor property is /");
     }
 
     @Test
     @EnabledIfEnvironmentVariable(named = "GDMSESSION", matches = "ubuntu")
     public void onlyRunOnUbuntuServer() {
-        System.out.println("only runs if GDMSESSION is ubuntu");
+        LOGGER.debug("only runs if GDMSESSION is ubuntu");
     }
 
     @Test
     @DisabledIfEnvironmentVariable(named = "LC_TIME", matches = ".*UTF-8.")
     public void shouldNotRunWhenTimeIsNotUTF8() {
-        System.out.println("will not run if environment variable LC_TIME is UTF-8");
+        LOGGER.debug("will not run if environment variable LC_TIME is UTF-8");
     }
 
     // Commented codes are going to work prior JUnit 5.5
@@ -76,13 +91,13 @@ public class ConditionalAnnotationsUnitTest {
     @Test
     // @EnabledIf("'FR' == systemProperty.get('user.country')")
     public void onlyFrenchPeopleWillRunThisMethod() {
-        System.out.println("will run only if user.country is FR");
+        LOGGER.debug("will run only if user.country is FR");
     }
 
     @Test
     // @DisabledIf("java.lang.System.getProperty('os.name').toLowerCase().contains('mac')")
     public void shouldNotRunOnMacOS() {
-        System.out.println("will not run if our os.name is mac");
+        LOGGER.debug("will not run if our os.name is mac");
     }
 
     @Test
@@ -97,14 +112,14 @@ public class ConditionalAnnotationsUnitTest {
       engine = "nashorn",
       reason = "Self-fulfilling: {result}")*/
     public void onlyRunsInFebruary() {
-        System.out.println("this test only runs in February");
+        LOGGER.debug("this test only runs in February");
     }
 
     @Test
     /*@DisabledIf("systemEnvironment.get('XPC_SERVICE_NAME') != null " +
       "&& systemEnvironment.get('XPC_SERVICE_NAME').contains('intellij')")*/
     public void notValidForIntelliJ() {
-        System.out.println("this test will run if our ide is INTELLIJ");
+        LOGGER.debug("this test will run if our ide is INTELLIJ");
     }
 
     @Target(ElementType.METHOD)
@@ -117,7 +132,7 @@ public class ConditionalAnnotationsUnitTest {
 
     @ThisTestWillOnlyRunAtLinuxAndMacWithJava9Or10Or11
     public void someSuperTestMethodHere() {
-        System.out.println("this method will run with java9, 10, 11 and Linux or macOS.");
+        LOGGER.debug("this method will run with java9, 10, 11 and Linux or macOS.");
     }
 
     @Target(ElementType.METHOD)
@@ -129,6 +144,6 @@ public class ConditionalAnnotationsUnitTest {
     @RepeatedTest(2)
     @CoinToss
     public void gamble() {
-        System.out.println("This tests run status is a gamble with %50 rate");
+        LOGGER.debug("This tests run status is a gamble with %50 rate");
     }
 }

testing-modules/junit5-annotations/src/test/java/com/baeldung/junit5/templates/DisabledOnQAEnvironmentExtension.java

@@ -3,11 +3,16 @@ package com.baeldung.junit5.templates;
 import org.junit.jupiter.api.extension.ConditionEvaluationResult;
 import org.junit.jupiter.api.extension.ExecutionCondition;
 import org.junit.jupiter.api.extension.ExtensionContext;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
 import java.util.Properties;
 
 public class DisabledOnQAEnvironmentExtension implements ExecutionCondition {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(DisabledOnQAEnvironmentExtension.class);
+    
     @Override
     public ConditionEvaluationResult evaluateExecutionCondition(ExtensionContext context) {
         Properties properties = new Properties();
@@ -16,7 +21,7 @@ public class DisabledOnQAEnvironmentExtension implements ExecutionCondition {
                 .getResourceAsStream("application.properties"));
             if ("qa".equalsIgnoreCase(properties.getProperty("env"))) {
                 String reason = String.format("The test '%s' is disabled on QA environment", context.getDisplayName());
-                System.out.println(reason);
+                LOGGER.debug(reason);
                 return ConditionEvaluationResult.disabled(reason);
             }
         } catch (IOException e) {

testing-modules/junit5-annotations/src/test/java/com/baeldung/junit5/templates/UserIdGeneratorTestInvocationContextProvider.java

@@ -1,6 +1,15 @@
 package com.baeldung.junit5.templates;
 
-import org.junit.jupiter.api.extension.*;
+import org.junit.jupiter.api.extension.AfterEachCallback;
+import org.junit.jupiter.api.extension.AfterTestExecutionCallback;
+import org.junit.jupiter.api.extension.BeforeEachCallback;
+import org.junit.jupiter.api.extension.BeforeTestExecutionCallback;
+import org.junit.jupiter.api.extension.Extension;
+import org.junit.jupiter.api.extension.ExtensionContext;
+import org.junit.jupiter.api.extension.TestTemplateInvocationContext;
+import org.junit.jupiter.api.extension.TestTemplateInvocationContextProvider;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.util.List;
 import java.util.stream.Stream;
@@ -9,6 +18,8 @@ import static java.util.Arrays.asList;
 
 public class UserIdGeneratorTestInvocationContextProvider implements TestTemplateInvocationContextProvider {
 
+    private static final Logger LOGGER = LoggerFactory.getLogger(UserIdGeneratorTestInvocationContextProvider.class);
+    
     @Override
     public boolean supportsTestTemplate(ExtensionContext extensionContext) {
         return true;
@@ -44,13 +55,13 @@ public class UserIdGeneratorTestInvocationContextProvider implements TestTemplat
                     new BeforeTestExecutionCallback() {
                         @Override
                         public void beforeTestExecution(ExtensionContext extensionContext) {
-                            System.out.println("BeforeTestExecutionCallback:Disabled context");
+                            LOGGER.debug("BeforeTestExecutionCallback:Disabled context");
                         }
                     }, 
                     new AfterTestExecutionCallback() {
                         @Override
                         public void afterTestExecution(ExtensionContext extensionContext) {
-                            System.out.println("AfterTestExecutionCallback:Disabled context");
+                            LOGGER.debug("AfterTestExecutionCallback:Disabled context");
                         }
                 });
             }
@@ -72,13 +83,13 @@ public class UserIdGeneratorTestInvocationContextProvider implements TestTemplat
                     new BeforeEachCallback() {
                         @Override
                         public void beforeEach(ExtensionContext extensionContext) {
-                            System.out.println("BeforeEachCallback:Enabled context");
+                            LOGGER.debug("BeforeEachCallback:Enabled context");
                         }
                     }, 
                     new AfterEachCallback() {
                         @Override
                         public void afterEach(ExtensionContext extensionContext) {
-                            System.out.println("AfterEachCallback:Enabled context");
+                            LOGGER.debug("AfterEachCallback:Enabled context");
                         }
                     });
             }

testing-modules/testing-assertions/src/main/java/com/baeldung/junit/log/BusinessWorker.java

@@ -4,7 +4,7 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 public class BusinessWorker {
-    private static Logger LOGGER = LoggerFactory.getLogger(BusinessWorker.class);
+    private static final Logger LOGGER = LoggerFactory.getLogger(BusinessWorker.class);
 
     public void generateLogs(String msg) {
         LOGGER.trace(msg);