Add a test for JDK 11
diff --git a/Jenkinsfile.sample b/Jenkinsfile.sample
index 9ea76f3..7862bcc 100644
--- a/Jenkinsfile.sample
+++ b/Jenkinsfile.sample
@@ -20,6 +20,8 @@
 try {
         
 node('ubuntu') {
+        def JAVA_JDK_11=tool name: 'JDK 11 (latest)', type: 'hudson.model.JDK'
+        echo "Testing with Java $JAVA_JDK_11"      
         def JAVA_JDK_9=tool name: 'JDK 1.9 (latest)', type: 'hudson.model.JDK'
         echo "Testing with Java $JAVA_JDK_9"
         def JAVA_JDK_8=tool name: 'JDK 1.8 (latest)', type: 'hudson.model.JDK'
@@ -35,6 +37,13 @@
         def ANT_LATEST=tool name: 'Ant (latest)', type: 'hudson.tasks.Ant$AntInstallation'
         echo "Testing with Ant $ANT_LATEST"
         
+        stage('JAVA 11 (Latest) on Ubuntu'){
+        withEnv(["Path+JDK=$JAVA_JDK_11/bin","JAVA_HOME=$JAVA_JDK_11"]) {
+                sh "java -version"
+                sh "javac -version"
+                }
+        } //end stage JAVA 11
+        
         stage('JAVA 1.9 (Latest) on Ubuntu'){
         withEnv(["Path+JDK=$JAVA_JDK_9/bin","JAVA_HOME=$JAVA_JDK_9"]) {
                 sh "java -version"