Change single quote to double quote to reference job variable in sh
diff --git a/Jenkinsfile b/Jenkinsfile
index 4455a04..e989a0d 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -62,12 +62,12 @@
                       try {
                           retry(3) {
                               timeout(time: 2, unit: 'HOURS') {
-                                sh '''
+                                sh """
                                   export JAVA_HOME=/usr/lib/jvm/jdk11
                                   export PATH=${JAVA_HOME}/bin:${PATH}
                                   export CLASSPATH=$WORKSPACE/glassfish6/javadb
                                   ./appserver/tests/gftest.sh run_test ${job}
-                                '''
+                                """
                               }
                           }
                       } finally {