I’m attempting to build from the latest commit on git and receive the following 
error upon attempting to access the application web ui:

HTTP ERROR: 500

Problem accessing /jobs/. Reason:

    Server Error
Powered by Jetty://

My driver also prints this error:

java.lang.UnsupportedOperationException: empty.max
        at scala.collection.TraversableOnce$class.max(TraversableOnce.scala:216)
        at scala.collection.AbstractTraversable.max(Traversable.scala:105)
        at 
org.apache.spark.ui.jobs.AllJobsPage.org$apache$spark$ui$jobs$AllJobsPage$$makeRow$1(AllJobsPage.scala:46)
        at 
org.apache.spark.ui.jobs.AllJobsPage$$anonfun$jobsTable$1.apply(AllJobsPage.scala:91)
        at 
org.apache.spark.ui.jobs.AllJobsPage$$anonfun$jobsTable$1.apply(AllJobsPage.scala:91)
        at 
scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
        at 
scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
        at scala.collection.immutable.List.foreach(List.scala:318)
        at scala.collection.TraversableLike$class.map(TraversableLike.scala:244)
        at scala.collection.AbstractTraversable.map(Traversable.scala:105)
        at org.apache.spark.ui.jobs.AllJobsPage.jobsTable(AllJobsPage.scala:91)
        at org.apache.spark.ui.jobs.AllJobsPage.render(AllJobsPage.scala:106)
        at org.apache.spark.ui.WebUI$$anonfun$attachPage$1.apply(WebUI.scala:68)
        at org.apache.spark.ui.WebUI$$anonfun$attachPage$1.apply(WebUI.scala:68)
        at org.apache.spark.ui.JettyUtils$$anon$1.doGet(JettyUtils.scala:68)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:735)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
        at 
org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:684)
        at 
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:501)
        at 
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)
        at 
org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:428)
        at 
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)
        at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
        at 
org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:255)
        at 
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
        at org.eclipse.jetty.server.Server.handle(Server.java:370)
        at 
org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:494)
        at 
org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:971)
        at 
org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1033)
        at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:644)
        at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
        at 
org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
        at 
org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:667)
        at 
org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)
        at 
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
        at 
org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
        at java.lang.Thread.run(Thread.java:745)


Has the ui been disabled intentionally for development purposes, have I not set 
something up correctly, or is this a bug?

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