diff --git a/guava/pom.xml b/guava/pom.xml
index a7b4e79e34..b40df178a6 100644
--- a/guava/pom.xml
+++ b/guava/pom.xml
@@ -57,6 +57,32 @@
             <scope>test</scope>
         </dependency>
 
+        <!-- logging -->
+
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-api</artifactId>
+            <version>${org.slf4j.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>ch.qos.logback</groupId>
+            <artifactId>logback-classic</artifactId>
+            <version>${logback.version}</version>
+            <!-- <scope>runtime</scope> -->
+        </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>jcl-over-slf4j</artifactId>
+            <version>${org.slf4j.version}</version>
+            <!-- <scope>runtime</scope> --> <!-- some spring dependencies need to compile against jcl -->
+        </dependency>
+        <dependency> <!-- needed to bridge to slf4j for projects that use the log4j APIs directly -->
+            <groupId>org.slf4j</groupId>
+            <artifactId>log4j-over-slf4j</artifactId>
+            <version>${org.slf4j.version}</version>
+        </dependency>
+
+
     </dependencies>
 
     <build>
@@ -105,6 +131,9 @@
         <maven-compiler-plugin.version>3.6.0</maven-compiler-plugin.version>
         <maven-surefire-plugin.version>2.19.1</maven-surefire-plugin.version>
 
+        <!-- logging -->
+        <org.slf4j.version>1.7.21</org.slf4j.version>
+        <logback.version>1.1.7</logback.version>
     </properties>
 
 </project>
\ No newline at end of file
diff --git a/guava/src/test/java/org/baeldung/guava/CustomEvent.java b/guava/src/test/java/org/baeldung/guava/CustomEvent.java
index 78348065b2..2d5c3382d4 100644
--- a/guava/src/test/java/org/baeldung/guava/CustomEvent.java
+++ b/guava/src/test/java/org/baeldung/guava/CustomEvent.java
@@ -1,6 +1,5 @@
 package org.baeldung.guava;
 
-
 public class CustomEvent {
     private String action;
 
diff --git a/guava/src/test/java/org/baeldung/guava/EventBusWrapper.java b/guava/src/test/java/org/baeldung/guava/EventBusWrapper.java
index eddaca0baf..243bc9e6ea 100644
--- a/guava/src/test/java/org/baeldung/guava/EventBusWrapper.java
+++ b/guava/src/test/java/org/baeldung/guava/EventBusWrapper.java
@@ -6,17 +6,16 @@ class EventBusWrapper {
 
     private static EventBus eventBus = new EventBus();
 
-    static void register(Object object){
+    static void register(Object object) {
         eventBus.register(object);
     }
 
-    static void unregister(Object object){
+    static void unregister(Object object) {
         eventBus.unregister(object);
     }
 
-    static void post(Object object){
+    static void post(Object object) {
         eventBus.post(object);
     }
 
-
 }
diff --git a/guava/src/test/java/org/baeldung/guava/EventListener.java b/guava/src/test/java/org/baeldung/guava/EventListener.java
index 17a3ac093e..02f22ce6b9 100644
--- a/guava/src/test/java/org/baeldung/guava/EventListener.java
+++ b/guava/src/test/java/org/baeldung/guava/EventListener.java
@@ -1,25 +1,23 @@
 package org.baeldung.guava;
+
 import com.google.common.eventbus.Subscribe;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 public class EventListener {
 
     private static int eventsHandled;
+    private static final Logger LOG = LoggerFactory.getLogger(EventListener.class);
 
-    /**
-     * Handles events of type String     *
-     */
     @Subscribe
-    public void stringEvent(String event){
-        System.out.println("do event ["+event+"]");
+    public void stringEvent(String event) {
+        LOG.info("do event [" + event + "]");
         eventsHandled++;
     }
 
-    /**
-     * Handles events of type CustomEvent
-     */
     @Subscribe
-    public void someEvent(CustomEvent customEvent){
-        System.out.println("do event ["+ customEvent.getAction()+"]");
+    public void someCustomEvent(CustomEvent customEvent) {
+        LOG.info("do event [" + customEvent.getAction() + "]");
         eventsHandled++;
     }
 
@@ -27,7 +25,7 @@ public class EventListener {
         return eventsHandled;
     }
 
-    public void resetEventsHandled(){
+    public void resetEventsHandled() {
         eventsHandled = 0;
     }
 }
diff --git a/guava/src/test/java/org/baeldung/guava/GuavaEventBusTest.java b/guava/src/test/java/org/baeldung/guava/GuavaEventBusTest.java
index 09f7eb775d..62e275fe92 100644
--- a/guava/src/test/java/org/baeldung/guava/GuavaEventBusTest.java
+++ b/guava/src/test/java/org/baeldung/guava/GuavaEventBusTest.java
@@ -10,32 +10,32 @@ public class GuavaEventBusTest {
     private EventListener listener;
 
     @Before
-    public void setUp() throws Exception {
+    public void setUp() {
         listener = new EventListener();
         EventBusWrapper.register(listener);
     }
 
     @After
-    public void tearDown() throws Exception {
+    public void tearDown() {
         EventBusWrapper.unregister(listener);
     }
 
     @Test
-    public void givenStringEvent_whenEventHandled_thenSuccess() throws Exception {
+    public void givenStringEvent_whenEventHandled_thenSuccess() {
         listener.resetEventsHandled();
 
         EventBusWrapper.post("String Event");
-        assertEquals(1,listener.getEventsHandled());
+        assertEquals(1, listener.getEventsHandled());
 
     }
 
     @Test
-    public void givenCustomEvent_whenEventHandled_thenSuccess() throws Exception {
+    public void givenCustomEvent_whenEventHandled_thenSuccess() {
         listener.resetEventsHandled();
 
         CustomEvent customEvent = new CustomEvent("Custom Event");
         EventBusWrapper.post(customEvent);
 
-        assertEquals(1,listener.getEventsHandled());
+        assertEquals(1, listener.getEventsHandled());
     }
 }