Adding pipeline constant declarations
diff --git a/Jenkinsfile b/Jenkinsfile
index ecb7717..f5002c7 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -21,33 +21,36 @@
  * Jenkins Pipeline configuration.
  *
  */
-node('ubuntu') {
+
+def labels = 'ubuntu'
+def buildJdk = 'JDK 1.8 (latest)'
+def buildMvn = 'Maven 3.5.2'
+def deploySettings = 'DefaultMavenSettingsProvider.1331204114925'
+
+node(labels) {
 
     stage ('Clone Sources') {
-
         git url: 'https://gitbox.apache.org/repos/asf/archiva-redback-components-parent.git'
-
     }
 
     stage ('Build') {
         withMaven(
-                // Maven installation declared in the Jenkins "Global Tool Configuration"
-                maven: 'Maven 3.5.2', jdk: 'JDK 1.8 (latest)') {
+                maven: buildMvn,
+                jdk: buildJdk
+        ) {
             // Run the maven build
             sh "mvn clean install -B -U -e -fae -Dmaven.compiler.fork=false"
-
         } // withMaven will discover the generated Maven artifacts, JUnit Surefire & FailSafe & FindBugs reports...
     }
 
     stage ('Deploy') {
         withMaven(
-                maven: 'Maven 3.5.2',
-                jdk: 'JDK 1.8 (latest)',
-                mavenSettingsConfig: 'DefaultMavenSettingsProvider.1331204114925'
+                maven: buildMvn,
+                jdk: buildJdk,
+                mavenSettingsConfig: deploySettings
         ) {
             // Run the maven build
             sh "mvn clean deploy -Dmaven.test.skip=true -B -U -e -fae -Dmaven.compiler.fork=false"
-
         } // withMaven will discover the generated Maven artifacts, JUnit Surefire & FailSafe & FindBugs reports...
     }
 }
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