diff --git a/hazelcast/pom.xml b/hazelcast/pom.xml
index 287542be33..69444308a3 100644
--- a/hazelcast/pom.xml
+++ b/hazelcast/pom.xml
@@ -1,8 +1,8 @@
 <?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">
+        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">
     <modelVersion>4.0.0</modelVersion>
     <artifactId>hazelcast</artifactId>
     <version>0.0.1-SNAPSHOT</version>
@@ -15,7 +15,6 @@
     </parent>
 
     <dependencies>
-        <!-- Hazelcast Jet -->
         <dependency>
             <groupId>com.hazelcast.jet</groupId>
             <artifactId>hazelcast-jet</artifactId>
@@ -34,8 +33,7 @@
     </build>
 
     <properties>
-        <!-- hazelcast jet -->
-        <hazelcast.jet.version>0.6</hazelcast.jet.version>
+        <hazelcast.jet.version>4.2</hazelcast.jet.version>
     </properties>
 
 </project>
\ No newline at end of file
diff --git a/hazelcast/src/main/java/com/baeldung/hazelcast/cluster/NativeClient.java b/hazelcast/src/main/java/com/baeldung/hazelcast/cluster/NativeClient.java
index 697e362289..3e58897401 100644
--- a/hazelcast/src/main/java/com/baeldung/hazelcast/cluster/NativeClient.java
+++ b/hazelcast/src/main/java/com/baeldung/hazelcast/cluster/NativeClient.java
@@ -1,24 +1,20 @@
 package com.baeldung.hazelcast.cluster;
 
-import java.util.Map.Entry;
-
 import com.hazelcast.client.HazelcastClient;
 import com.hazelcast.client.config.ClientConfig;
-import com.hazelcast.config.GroupConfig;
 import com.hazelcast.core.HazelcastInstance;
-import com.hazelcast.core.IMap;
+
+import java.util.Map;
 
 public class NativeClient {
 
-    public static void main(String[] args) throws InterruptedException {
+    public static void main(String[] args) {
         ClientConfig config = new ClientConfig();
-        GroupConfig groupConfig = config.getGroupConfig();
-        groupConfig.setName("dev");
-        groupConfig.setPassword("dev-pass");
+        config.setClusterName("dev");
         HazelcastInstance hazelcastInstanceClient = HazelcastClient.newHazelcastClient(config);
-        IMap<Long, String> map = hazelcastInstanceClient.getMap("data");
-        for (Entry<Long, String> entry : map.entrySet()) {
-            System.out.println(String.format("Key: %d, Value: %s", entry.getKey(), entry.getValue()));
+        Map<Long, String> map = hazelcastInstanceClient.getMap("data");
+        for (Map.Entry<Long, String> entry : map.entrySet()) {
+            System.out.printf("Key: %d, Value: %s%n", entry.getKey(), entry.getValue());
         }
     }
 }
diff --git a/hazelcast/src/main/java/com/baeldung/hazelcast/cluster/ServerNode.java b/hazelcast/src/main/java/com/baeldung/hazelcast/cluster/ServerNode.java
index 36028834a4..7c903e961a 100644
--- a/hazelcast/src/main/java/com/baeldung/hazelcast/cluster/ServerNode.java
+++ b/hazelcast/src/main/java/com/baeldung/hazelcast/cluster/ServerNode.java
@@ -1,19 +1,19 @@
 package com.baeldung.hazelcast.cluster;
 
-import java.util.Map;
-
 import com.hazelcast.core.Hazelcast;
 import com.hazelcast.core.HazelcastInstance;
-import com.hazelcast.core.IdGenerator;
+import com.hazelcast.flakeidgen.FlakeIdGenerator;
+
+import java.util.Map;
 
 public class ServerNode {
 
     public static void main(String[] args) {
         HazelcastInstance hazelcastInstance = Hazelcast.newHazelcastInstance();
         Map<Long, String> map = hazelcastInstance.getMap("data");
-        IdGenerator idGenerator = hazelcastInstance.getIdGenerator("newid");
+        FlakeIdGenerator idGenerator = hazelcastInstance.getFlakeIdGenerator("newid");
         for (int i = 0; i < 10; i++) {
-            map.put(idGenerator.newId(), "message" + 1);
+            map.put(idGenerator.newId(), "message" + i);
         }
     }
 }
diff --git a/hazelcast/src/main/java/com/baeldung/hazelcast/jet/WordCounter.java b/hazelcast/src/main/java/com/baeldung/hazelcast/jet/WordCounter.java
index 971986bcae..5d10650f89 100644
--- a/hazelcast/src/main/java/com/baeldung/hazelcast/jet/WordCounter.java
+++ b/hazelcast/src/main/java/com/baeldung/hazelcast/jet/WordCounter.java
@@ -1,33 +1,31 @@
 package com.baeldung.hazelcast.jet;
 
-import java.util.List;
-import java.util.Map;
-
-import static com.hazelcast.jet.Traversers.traverseArray;
-import static com.hazelcast.jet.aggregate.AggregateOperations.counting;
-import static com.hazelcast.jet.function.DistributedFunctions.wholeItem;
-
 import com.hazelcast.jet.Jet;
 import com.hazelcast.jet.JetInstance;
 import com.hazelcast.jet.pipeline.Pipeline;
 import com.hazelcast.jet.pipeline.Sinks;
 import com.hazelcast.jet.pipeline.Sources;
 
+import java.util.List;
+import java.util.Map;
+
+import static com.hazelcast.function.Functions.wholeItem;
+import static com.hazelcast.jet.Traversers.traverseArray;
+import static com.hazelcast.jet.aggregate.AggregateOperations.counting;
+
 public class WordCounter {
 
     private static final String LIST_NAME = "textList";
-
     private static final String MAP_NAME = "countMap";
 
     private Pipeline createPipeLine() {
         Pipeline p = Pipeline.create();
-        p.drawFrom(Sources.<String> list(LIST_NAME))
-            .flatMap(word -> traverseArray(word.toLowerCase()
-                .split("\\W+")))
+        p.readFrom(Sources.<String>list(LIST_NAME))
+            .flatMap(word -> traverseArray(word.toLowerCase().split("\\W+")))
             .filter(word -> !word.isEmpty())
             .groupingKey(wholeItem())
             .aggregate(counting())
-            .drainTo(Sinks.map(MAP_NAME));
+            .writeTo(Sinks.map(MAP_NAME));
         return p;
     }
 
@@ -38,8 +36,7 @@ public class WordCounter {
             List<String> textList = jet.getList(LIST_NAME);
             textList.addAll(sentences);
             Pipeline p = createPipeLine();
-            jet.newJob(p)
-                .join();
+            jet.newJob(p).join();
             Map<String, Long> counts = jet.getMap(MAP_NAME);
             count = counts.get(word);
         } finally {
diff --git a/hazelcast/src/test/java/com/baeldung/hazelcast/jet/WordCounterUnitTest.java b/hazelcast/src/test/java/com/baeldung/hazelcast/jet/WordCounterUnitTest.java
index 95596b3860..7a60cd9a01 100644
--- a/hazelcast/src/test/java/com/baeldung/hazelcast/jet/WordCounterUnitTest.java
+++ b/hazelcast/src/test/java/com/baeldung/hazelcast/jet/WordCounterUnitTest.java
@@ -1,11 +1,11 @@
 package com.baeldung.hazelcast.jet;
 
-import static org.junit.Assert.assertTrue;
+import org.junit.Test;
 
 import java.util.ArrayList;
 import java.util.List;
 
-import org.junit.Test;
+import static org.junit.Assert.assertEquals;
 
 public class WordCounterUnitTest {
 
@@ -15,7 +15,7 @@ public class WordCounterUnitTest {
         sentences.add("The first second was alright, but the second second was tough.");
         WordCounter wordCounter = new WordCounter();
         long countSecond = wordCounter.countWord(sentences, "second");
-        assertTrue(countSecond == 3);
+        assertEquals(3, countSecond);
     }
 
 }