Fix JenkinsFile
diff --git a/Jenkinsfile b/Jenkinsfile
index 0da8cc0..8a16e4c 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -17,4 +17,4 @@
  * under the License.
  */
 
-asfMavenTlpPlgnBuild(jdk:[7,8,9])
+asfMavenTlpPlgnBuild(jdk:['7','8','9'])