diff --git a/jenkins/docker-compose.yaml b/jenkins/docker-compose.yaml
index 06d37b2..015d008 100644
--- a/jenkins/docker-compose.yaml
+++ b/jenkins/docker-compose.yaml
@@ -5,8 +5,8 @@ services:
     privileged: true
     user: root
     ports:
-      - 8081:8080
-      - 50000:50000
+      - "8081:8080"
+      - "50000:50000"
     container_name: jenkins
     volumes:
       - ~/jenkins:/var/jenkins_home
diff --git a/test/groovy/util/Result.groovy b/test/groovy/util/Result.groovy
index c7db8d9..b3ad2d2 100644
--- a/test/groovy/util/Result.groovy
+++ b/test/groovy/util/Result.groovy
@@ -5,9 +5,9 @@ class Result {
     def actions = []
     int status
 
-    def Result() {}
+    Result() {}
 
-    def int status() {
+    int status() {
         return status
     }
 }
\ No newline at end of file
diff --git a/test/groovy/vars/KustomizeTest.groovy b/test/groovy/vars/KustomizeTest.groovy
index f6f68d1..c3f184d 100644
--- a/test/groovy/vars/KustomizeTest.groovy
+++ b/test/groovy/vars/KustomizeTest.groovy
@@ -1,7 +1,7 @@
 package groovy.vars
 
 import static com.lesfurets.jenkins.unit.MethodCall.callArgsToString
-import static org.assertj.core.api.Assertions.*;
+import static org.assertj.core.api.Assertions.*
 
 import com.lesfurets.jenkins.unit.BasePipelineTest
 import org.junit.Before
@@ -9,7 +9,7 @@ import org.junit.Test
 
 class KustomizeTest extends BasePipelineTest {
 
-    Script kustomize;
+    Script kustomize
 
     @Before
     @Override
diff --git a/vars/cleanBuilds.groovy b/vars/cleanBuilds.groovy
index e91e4a4..640c812 100644
--- a/vars/cleanBuilds.groovy
+++ b/vars/cleanBuilds.groovy
@@ -5,7 +5,7 @@ import com.jenkinsci.plugins.badge.action.BadgeAction
 // the function implements how many build per environment should be kept
 // parameter is maxKeepBuilds
 def call(Map args) {
-  def maxNumberToKeepBuilds = args?.maxKeepBuilds ?: 10;
+  def maxNumberToKeepBuilds = args?.maxKeepBuilds ?: 10
 
   def environmentBuildCount = [:]
   Jenkins.instance.getItemByFullName(args.job)
diff --git a/vars/openshiftUtils.groovy b/vars/openshiftUtils.groovy
index fae1d81..c231080 100644
--- a/vars/openshiftUtils.groovy
+++ b/vars/openshiftUtils.groovy
@@ -10,7 +10,7 @@
 // credentialsId -> credentials for the OpenShift login
 // namespace -> true adds NAMESPACE_NAME param
 //
-def void applyTemplate(String ocpUrl, String ocpProject, String templateFile, String credentialsId, boolean namespace) {
+void applyTemplate(String ocpUrl, String ocpProject, String templateFile, String credentialsId, boolean namespace) {
 
     echo "-- start resource update by template --"
     echo "OpenShift server URL: $ocpUrl"
@@ -47,7 +47,7 @@ def void applyTemplate(String ocpUrl, String ocpProject, String templateFile, St
 // envFile -> environment file
 // namespace -> true adds NAMESPACE_NAME param
 //
-def void applyTemplateWithEnvFile(String ocpUrl, String ocpProject, String templateFile, String credentialsId, String envFile, boolean namespace) {
+void applyTemplateWithEnvFile(String ocpUrl, String ocpProject, String templateFile, String credentialsId, String envFile, boolean namespace) {
 
     echo "-- start resource update by template with environment file --"
     echo "OpenShift server URL: $ocpUrl"