diff --git a/tasks/config/downloadSelenium.js b/tasks/config/downloadSelenium.js
index d69fa8d406276c..132f44fafb3943 100644
--- a/tasks/config/downloadSelenium.js
+++ b/tasks/config/downloadSelenium.js
@@ -1,14 +1,18 @@
 var path = require('path');
+import { resolve as resolveUrl } from 'url';
 
+const URL = 'https://selenium-release.storage.googleapis.com/2.48/selenium-server-standalone-2.48.2.jar';
+const DIR = resolveUrl(URL, './');
+const FILE = URL.replace(DIR, '');
 
 module.exports = function (grunt) {
   return {
     options: {
       selenium: {
-        filename: 'selenium-server-standalone-2.48.2.jar',
-        server: 'https://selenium-release.storage.googleapis.com/2.48/',
+        filename: FILE,
+        server: DIR,
         md5: 'b2784fc67c149d3c13c83d2108104689',
-        directory: path.join(grunt.config.get('root'), 'selenium')
+        path: path.join(grunt.config.get('root'), 'selenium', FILE)
       }
     }
   };
diff --git a/tasks/config/run.js b/tasks/config/run.js
index 36f166b5477b5e..e98bfe894e7257 100644
--- a/tasks/config/run.js
+++ b/tasks/config/run.js
@@ -122,7 +122,7 @@ module.exports = function (grunt) {
       cmd: 'java',
       args: [
         '-jar',
-        'selenium/selenium-server-standalone-2.48.2.jar',
+        '<%= downloadSelenium.options.selenium.path %>',
         '-port',
         uiConfig.servers.webdriver.port,
       ]
@@ -138,7 +138,7 @@ module.exports = function (grunt) {
       cmd: 'java',
       args: [
         '-jar',
-        'selenium/selenium-server-standalone-2.48.2.jar',
+        '<%= downloadSelenium.options.selenium.path %>',
         '-port',
         uiConfig.servers.webdriver.port,
       ]
diff --git a/tasks/download_selenium.js b/tasks/download_selenium.js
index 62840493ee2a8e..cdce3e0ade2116 100644
--- a/tasks/download_selenium.js
+++ b/tasks/download_selenium.js
@@ -11,8 +11,9 @@ module.exports = function (grunt) {
     const done = this.async();
     const config = this.options();
 
-    const SELENIUM_FILE_PATH = path.join(config.selenium.directory, config.selenium.filename);
-    const SELENIUM_DOWNLOAD_URL = config.selenium.server + config.selenium.filename;
+    const FILE = config.selenium.path;
+    const DIR = path.dirname(config.selenium.path);
+    const URL = config.selenium.server + config.selenium.filename;
 
     function validateDownload(path, expectedHash, success) {
       grunt.log.write('Validating hash...');
@@ -28,27 +29,27 @@ module.exports = function (grunt) {
     }
 
     function downloadSelenium(success) {
-      grunt.log.write(`Downloading ${SELENIUM_DOWNLOAD_URL}...`);
-      request.get(SELENIUM_DOWNLOAD_URL)
-      .pipe(fs.createWriteStream(SELENIUM_FILE_PATH))
+      grunt.log.write(`Downloading ${URL}...`);
+      request.get(URL)
+      .pipe(fs.createWriteStream(FILE))
       .on('error', function downloadError(err) {
         grunt.fail.warn(err);
       })
       .on('finish', function downloadFinish() {
         grunt.log.writeln('done');
-        validateDownload(SELENIUM_FILE_PATH, config.selenium.md5, success);
+        validateDownload(FILE, config.selenium.md5, success);
       });
     }
 
     function start() {
       try {
-        fs.mkdirSync(config.selenium.directory);
+        fs.mkdirSync(DIR);
       } catch (err) {
         if (err && err.code !== 'EEXIST') grunt.fail.warn(err);
       }
 
-      if (fs.existsSync(SELENIUM_FILE_PATH)) {
-        validateDownload(SELENIUM_FILE_PATH, config.selenium.md5, done);
+      if (fs.existsSync(FILE)) {
+        validateDownload(FILE, config.selenium.md5, done);
       } else {
         downloadSelenium(done);
       }
diff --git a/tasks/jenkins.js b/tasks/jenkins.js
index b1601ff0fbb3d5..77a2673cffb7e7 100644
--- a/tasks/jenkins.js
+++ b/tasks/jenkins.js
@@ -1,7 +1,18 @@
+import { compact } from 'lodash';
+import { delimiter } from 'path';
+
 module.exports = function (grunt) {
-  let { compact } = require('lodash');
   grunt.registerTask('jenkins', 'Jenkins build script', function () {
-    process.env.JAVA_HOME = '/usr/lib/jvm/jdk8';
+    // make sure JAVA_HOME points to JDK8
+    const HOME = '/usr/lib/jvm/jdk8';
+    process.env.JAVA_HOME = HOME;
+
+    // extend PATH to point to JDK8
+    const path = process.env.PATH.split(delimiter);
+    path.unshift(`${HOME}/bin`);
+    process.env.PATH = path.join(delimiter);
+
+    // always build os packages on jenkins
     grunt.option('os-packages', true);
 
     grunt.task.run(compact([