Debugging Spark standalone cluster with idea

Question

I am trying to debug a Spark Application on a local cluster using a master and a worker nodes. I have been successful at setting up the master node and worker nodes using Spark standalone cluster manager with start-master.sh and it works.But I want to how Spark Application works in the spark cluster, so I want to start the cluster in debug mode. I read the start-master.sh code， mock the args and start org.apache.spark.deploy.master.Master main method.Unfortunately it gets a NoClassDefFoundError,I can't open the webui. I want to know where the problem is.

The Error is :

Exception in thread "dispatcher-event-loop-1" java.lang.NoClassDefFoundError: org/eclipse/jetty/util/thread/ThreadPool
    at org.apache.spark.ui.WebUI.attachPage(WebUI.scala:81)
    at org.apache.spark.deploy.master.ui.MasterWebUI.initialize(MasterWebUI.scala:48)
    at org.apache.spark.deploy.master.ui.MasterWebUI.<init>(MasterWebUI.scala:43)
    at org.apache.spark.deploy.master.Master.onStart(Master.scala:131)
    at org.apache.spark.rpc.netty.Inbox$$anonfun$process$1.apply$mcV$sp(Inbox.scala:122)
    at org.apache.spark.rpc.netty.Inbox.safelyCall(Inbox.scala:205)
    at org.apache.spark.rpc.netty.Inbox.process(Inbox.scala:101)
    at org.apache.spark.rpc.netty.Dispatcher$MessageLoop.run(Dispatcher.scala:216)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ClassNotFoundException: org.eclipse.jetty.util.thread.ThreadPool
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 11 more

my debug configurations is: enter image description here

Thanks!