diff --git a/apache-httpclient-2/src/test/resources/logback.xml b/apache-httpclient-2/src/test/resources/logback.xml
index dc1bbea439..b9e0f5e6bf 100644
--- a/apache-httpclient-2/src/test/resources/logback.xml
+++ b/apache-httpclient-2/src/test/resources/logback.xml
@@ -6,9 +6,9 @@
     </appender>
     <logger name="com.baeldung.httpclient.cookies" level="info"/>
 
-    <logger name="com.baeldung.httpclient.readresponsebodystring" level="debug"/>
-    <logger name="org.apache.http" level="debug"/>
-    <logger name="org.apache.hc.client5.http" level="debug"/>
+    <logger name="com.baeldung.httpclient.readresponsebodystring" level="INFO"/>
+    <logger name="org.apache.http" level="WARN"/>
+    <logger name="org.apache.hc.client5.http" level="WARN"/>
 
     <root level="WARN">
         <appender-ref ref="stdout"/>
diff --git a/aws-modules/aws-lambda-modules/todo-reminder-lambda/ToDoFunction/src/main/java/com/baeldung/lambda/todo/config/Services.java b/aws-modules/aws-lambda-modules/todo-reminder-lambda/ToDoFunction/src/main/java/com/baeldung/lambda/todo/config/Services.java
index c1d85012eb..3d3d9b97b6 100644
--- a/aws-modules/aws-lambda-modules/todo-reminder-lambda/ToDoFunction/src/main/java/com/baeldung/lambda/todo/config/Services.java
+++ b/aws-modules/aws-lambda-modules/todo-reminder-lambda/ToDoFunction/src/main/java/com/baeldung/lambda/todo/config/Services.java
@@ -10,7 +10,7 @@ import feign.gson.GsonEncoder;
 import feign.slf4j.Slf4jLogger;
 import uk.org.webcompere.lightweightconfig.ConfigLoader;
 
-import static feign.Logger.Level.FULL;
+import static feign.Logger.Level.BASIC;
 
 public class Services extends AbstractModule {
     @Override
@@ -20,14 +20,14 @@ public class Services extends AbstractModule {
         ToDoApi toDoApi = Feign.builder()
           .decoder(new GsonDecoder())
           .logger(new Slf4jLogger())
-          .logLevel(FULL)
+          .logLevel(BASIC)
           .requestInterceptor(new BasicAuthRequestInterceptor(config.getToDoCredentials().getUsername(), config.getToDoCredentials().getPassword()))
           .target(ToDoApi.class, config.getToDoEndpoint());
 
         PostApi postApi = Feign.builder()
           .encoder(new GsonEncoder())
           .logger(new Slf4jLogger())
-          .logLevel(FULL)
+          .logLevel(BASIC)
           .requestInterceptor(new BasicAuthRequestInterceptor(config.getPostCredentials().getUsername(), config.getPostCredentials().getPassword()))
           .target(PostApi.class, config.getPostEndpoint());
 
diff --git a/core-groovy-modules/core-groovy/src/test/groovy/com/baeldung/closures/ClosuresUnitTest.groovy b/core-groovy-modules/core-groovy/src/test/groovy/com/baeldung/closures/ClosuresUnitTest.groovy
index 32c67e99bc..e2923e5d06 100644
--- a/core-groovy-modules/core-groovy/src/test/groovy/com/baeldung/closures/ClosuresUnitTest.groovy
+++ b/core-groovy-modules/core-groovy/src/test/groovy/com/baeldung/closures/ClosuresUnitTest.groovy
@@ -1,7 +1,5 @@
 package com.baeldung.closures
 
-import spock.lang.Specification
-
 class ClosuresUnitTest extends GroovyTestCase {
 
     Closures closures = new Closures()
@@ -64,9 +62,9 @@ class ClosuresUnitTest extends GroovyTestCase {
     
     void testClosureInLists() {
         def list = [10, 11, 12, 13, 14, true, false, "BUNTHER"]
-        list.each {
+        /*list.each {
             println it
-        }
+        }*/
         
         assert [13, 14] == list.findAll{ it instanceof Integer && it >= 13}
     }
diff --git a/core-java-modules/core-java-concurrency-basic-3/src/main/java/com/baeldung/concurrent/synchronizestatic/none/Employee.java b/core-java-modules/core-java-concurrency-basic-3/src/main/java/com/baeldung/concurrent/synchronizestatic/none/Employee.java
index ba722e15e9..54322bb860 100644
--- a/core-java-modules/core-java-concurrency-basic-3/src/main/java/com/baeldung/concurrent/synchronizestatic/none/Employee.java
+++ b/core-java-modules/core-java-concurrency-basic-3/src/main/java/com/baeldung/concurrent/synchronizestatic/none/Employee.java
@@ -18,7 +18,8 @@ public class Employee {
     }
 
     private static void incrementCount() {
-        System.out.println("Count = " + ++count);
+        ++count;
+        // System.out.println("Count = " + ++count);
     }
 
     public static Integer getCount() {
diff --git a/core-java-modules/core-java-concurrency-basic-3/src/main/java/com/baeldung/concurrent/synchronizestatic/reentrantlock/Employee.java b/core-java-modules/core-java-concurrency-basic-3/src/main/java/com/baeldung/concurrent/synchronizestatic/reentrantlock/Employee.java
index e74013ad0e..9abe70ceab 100644
--- a/core-java-modules/core-java-concurrency-basic-3/src/main/java/com/baeldung/concurrent/synchronizestatic/reentrantlock/Employee.java
+++ b/core-java-modules/core-java-concurrency-basic-3/src/main/java/com/baeldung/concurrent/synchronizestatic/reentrantlock/Employee.java
@@ -24,7 +24,8 @@ public class Employee {
     private static void incrementCount() {
         lock.lock();
         try {
-            System.out.println("Count = " + ++count);
+            ++count;
+            // System.out.println("Count = " + ++count);
         }
         finally {
             lock.unlock();
diff --git a/core-java-modules/core-java-concurrency-basic-3/src/main/java/com/baeldung/concurrent/synchronizestatic/synchronizedblock/Employee.java b/core-java-modules/core-java-concurrency-basic-3/src/main/java/com/baeldung/concurrent/synchronizestatic/synchronizedblock/Employee.java
index 4cf04e5b06..f6f733b991 100644
--- a/core-java-modules/core-java-concurrency-basic-3/src/main/java/com/baeldung/concurrent/synchronizestatic/synchronizedblock/Employee.java
+++ b/core-java-modules/core-java-concurrency-basic-3/src/main/java/com/baeldung/concurrent/synchronizestatic/synchronizedblock/Employee.java
@@ -21,7 +21,8 @@ public class Employee {
 
     private static void incrementCount() {
         synchronized(lock) {
-            System.out.println("Count = " + ++count);
+            ++count;
+            // System.out.println("Count = " + ++count);
         }
     }
 
diff --git a/core-java-modules/core-java-concurrency-basic-3/src/main/java/com/baeldung/concurrent/synchronizestatic/synchronizedclass/Employee.java b/core-java-modules/core-java-concurrency-basic-3/src/main/java/com/baeldung/concurrent/synchronizestatic/synchronizedclass/Employee.java
index 627040e88c..895827e8bb 100644
--- a/core-java-modules/core-java-concurrency-basic-3/src/main/java/com/baeldung/concurrent/synchronizestatic/synchronizedclass/Employee.java
+++ b/core-java-modules/core-java-concurrency-basic-3/src/main/java/com/baeldung/concurrent/synchronizestatic/synchronizedclass/Employee.java
@@ -19,7 +19,8 @@ public class Employee
 
     private static void incrementCount() {
         synchronized(Employee.class) {
-            System.out.println("Count = " + ++count);
+            ++count;
+            // System.out.println("Count = " + ++count);
         }
     }
 
diff --git a/core-java-modules/core-java-concurrency-basic-3/src/main/java/com/baeldung/concurrent/synchronizestatic/synchronizedmethod/Employee.java b/core-java-modules/core-java-concurrency-basic-3/src/main/java/com/baeldung/concurrent/synchronizestatic/synchronizedmethod/Employee.java
index f0a785c427..27bc040070 100644
--- a/core-java-modules/core-java-concurrency-basic-3/src/main/java/com/baeldung/concurrent/synchronizestatic/synchronizedmethod/Employee.java
+++ b/core-java-modules/core-java-concurrency-basic-3/src/main/java/com/baeldung/concurrent/synchronizestatic/synchronizedmethod/Employee.java
@@ -18,7 +18,8 @@ public class Employee {
     }
 
     private static synchronized void incrementCount() {
-        System.out.println("Count = " + ++count);
+        ++count;
+        // System.out.println("Count = " + ++count);
     }
 
     public static synchronized int getCount() {
diff --git a/core-java-modules/core-java-networking-3/src/main/java/com/baeldung/portscanner/PortScanner.java b/core-java-modules/core-java-networking-3/src/main/java/com/baeldung/portscanner/PortScanner.java
index 79a961e3fb..f0a01a6ae2 100644
--- a/core-java-modules/core-java-networking-3/src/main/java/com/baeldung/portscanner/PortScanner.java
+++ b/core-java-modules/core-java-networking-3/src/main/java/com/baeldung/portscanner/PortScanner.java
@@ -29,7 +29,7 @@ public class PortScanner {
                     openPorts.add(currentPort);
                     System.out.println(ip + " ,port open: " + currentPort);
                 } catch (IOException e) {
-                    System.err.println(e);
+                    // System.err.println(e);
                 }
             });
         }
diff --git a/core-java-modules/core-java-os/src/main/java/com/baeldung/java9/process/ProcessUtils.java b/core-java-modules/core-java-os/src/main/java/com/baeldung/java9/process/ProcessUtils.java
index 1b952f0c3c..d20436c8bd 100644
--- a/core-java-modules/core-java-os/src/main/java/com/baeldung/java9/process/ProcessUtils.java
+++ b/core-java-modules/core-java-os/src/main/java/com/baeldung/java9/process/ProcessUtils.java
@@ -12,7 +12,7 @@ public class ProcessUtils {
 
     public static String getClassPath() {
         String cp = System.getProperty("java.class.path");
-        System.out.println("ClassPath is " + cp);
+        // System.out.println("ClassPath is " + cp);
         return cp;
     }
 
diff --git a/core-java-modules/core-java-os/src/test/java/com/baeldung/processbuilder/ProcessBuilderUnitTest.java b/core-java-modules/core-java-os/src/test/java/com/baeldung/processbuilder/ProcessBuilderUnitTest.java
index d35cf6a665..d6a337bcd8 100644
--- a/core-java-modules/core-java-os/src/test/java/com/baeldung/processbuilder/ProcessBuilderUnitTest.java
+++ b/core-java-modules/core-java-os/src/test/java/com/baeldung/processbuilder/ProcessBuilderUnitTest.java
@@ -50,7 +50,7 @@ public class ProcessBuilderUnitTest {
     public void givenProcessBuilder_whenModifyEnvironment_thenSuccess() throws IOException, InterruptedException {
         ProcessBuilder processBuilder = new ProcessBuilder();
         Map<String, String> environment = processBuilder.environment();
-        environment.forEach((key, value) -> System.out.println(key + value));
+        // environment.forEach((key, value) -> System.out.println(key + value));
 
         environment.put("GREETING", "Hola Mundo");