diff --git a/src/de.rnd7.mqttgateway/src/main/java/de/rnd7/mqttgateway/GwMqttClient.java b/src/de.rnd7.mqttgateway/src/main/java/de/rnd7/mqttgateway/GwMqttClient.java
index e47d8cb..11d58f2 100644
--- a/src/de.rnd7.mqttgateway/src/main/java/de/rnd7/mqttgateway/GwMqttClient.java
+++ b/src/de.rnd7.mqttgateway/src/main/java/de/rnd7/mqttgateway/GwMqttClient.java
@@ -6,7 +6,6 @@
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Optional;
-import java.util.UUID;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicBoolean;
diff --git a/src/pom.xml b/src/pom.xml
index c49360b..1444606 100644
--- a/src/pom.xml
+++ b/src/pom.xml
@@ -8,6 +8,10 @@
 
     <packaging>pom</packaging>
 
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
     <distributionManagement>
         <repository>
             <id>github</id>
@@ -39,6 +43,13 @@
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-checkstyle-plugin</artifactId>
                 <version>3.1.2</version>
+                <dependencies>
+                    <dependency>
+                        <groupId>com.puppycrawl.tools</groupId>
+                        <artifactId>checkstyle</artifactId>
+                        <version>8.39</version>
+                    </dependency>
+                </dependencies>
                 <executions>
                     <execution>
                         <id>checkstyle</id>
@@ -55,9 +66,24 @@
                     </execution>
                 </executions>
             </plugin>
+            <plugin>
+                <groupId>org.jacoco</groupId>
+                <artifactId>jacoco-maven-plugin</artifactId>
+                <version>0.8.5</version>
+                <executions>
+                    <execution>
+                        <id>report</id>
+                        <phase>test</phase>
+                        <goals>
+                            <goal>report</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-source-plugin</artifactId>
+                <version>3.1.0</version>
                 <executions>
                     <execution>
                         <id>attach-sources</id>