diff --git a/async/pom.xml b/async/pom.xml
new file mode 100644
index 0000000..ce6d56a
--- /dev/null
+++ b/async/pom.xml
@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>java-cookbook</artifactId>
+        <groupId>fr.gasser</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>async</artifactId>
+
+
+</project>
\ No newline at end of file
diff --git a/async/src/main/java/threadexamples/producerconsumer/App.java b/async/src/main/java/threadexamples/producerconsumer/App.java
index fcfc904..e74b0f7 100644
--- a/async/src/main/java/threadexamples/producerconsumer/App.java
+++ b/async/src/main/java/threadexamples/producerconsumer/App.java
@@ -21,7 +21,7 @@ public class App {
         for (int i = 0; i < 3; i++) {
             final Consumer consumer = new Consumer("Consumer_" + i, itemQueue);
             executorService.submit(() -> {
-                while(true) {
+                while (true) {
                     consumer.consume();
                 }
             });
diff --git a/async/src/main/java/threadexamples/producerconsumer/Consumer.java b/async/src/main/java/threadexamples/producerconsumer/Consumer.java
index 49b32a7..c210c3e 100644
--- a/async/src/main/java/threadexamples/producerconsumer/Consumer.java
+++ b/async/src/main/java/threadexamples/producerconsumer/Consumer.java
@@ -5,7 +5,7 @@ import org.slf4j.LoggerFactory;
 
 import java.util.concurrent.BlockingQueue;
 
-public class Consumer {
+class Consumer {
 
     private static final Logger LOGGER = LoggerFactory.getLogger(Consumer.class);
 
@@ -13,12 +13,12 @@ public class Consumer {
     private String name;
     private int itemId;
 
-    public Consumer(String name, BlockingQueue<Item> itemQueue) {
+    Consumer(String name, BlockingQueue<Item> itemQueue) {
         this.itemQueue = itemQueue;
         this.name = name;
     }
 
-    public void consume() throws InterruptedException {
+    void consume() throws InterruptedException {
         final Item item = itemQueue.take();
         LOGGER.info("Consumer [{}] consume item [{}] produced by [{}]", name, item.getId(), item.getProducer());
     }
diff --git a/async/src/main/java/threadexamples/producerconsumer/Item.java b/async/src/main/java/threadexamples/producerconsumer/Item.java
index 9b300b3..72be41e 100644
--- a/async/src/main/java/threadexamples/producerconsumer/Item.java
+++ b/async/src/main/java/threadexamples/producerconsumer/Item.java
@@ -1,20 +1,20 @@
 package threadexamples.producerconsumer;
 
-public class Item {
+class Item {
 
     private String producer;
     private int id;
 
-    public Item(String producer, int id) {
+    Item(String producer, int id) {
         this.producer = producer;
         this.id = id;
     }
 
-    public String getProducer() {
+    String getProducer() {
         return producer;
     }
 
-    public int getId() {
+    int getId() {
         return id;
     }
 
diff --git a/async/src/main/java/threadexamples/producerconsumer/Producer.java b/async/src/main/java/threadexamples/producerconsumer/Producer.java
index aad2efd..4fabf7d 100644
--- a/async/src/main/java/threadexamples/producerconsumer/Producer.java
+++ b/async/src/main/java/threadexamples/producerconsumer/Producer.java
@@ -3,18 +3,18 @@ package threadexamples.producerconsumer;
 import java.util.Random;
 import java.util.concurrent.BlockingQueue;
 
-public class Producer {
+class Producer {
 
     private BlockingQueue<Item> itemQueue;
     private String name;
     private int itemId;
 
-    public Producer(String name, BlockingQueue itemQueue) {
+    Producer(String name, BlockingQueue<Item> itemQueue) {
         this.itemQueue = itemQueue;
         this.name = name;
     }
 
-    public void produce() throws InterruptedException {
+    void produce() throws InterruptedException {
         itemQueue.put(new Item(name, itemId++));
         Thread.sleep(new Random().nextInt(2000));
     }
diff --git a/pom.xml b/pom.xml
index 3f97cb9..0263028 100644
--- a/pom.xml
+++ b/pom.xml
@@ -9,6 +9,7 @@
     <modules>
         <module>reflection</module>
         <module>gui</module>
+        <module>async</module>
     </modules>
     
     <properties>