Flink idea启动WEBSERVER问题

环境: win10, idea2016, FLink1.7.1
maven已经导入

    <dependency>
        <groupId>org.apache.flink</groupId>
        <artifactId>flink-runtime-web_2.11</artifactId>
        <version>1.7.1</version>
    </dependency>

代码:

import org.apache.flink.streaming.api.functions.source.SourceFunction
import org.apache.flink.streaming.api.scala.{StreamExecutionEnvironment, _}
import org.apache.flink.configuration.ConfigConstants
import org.apache.flink.configuration.Configuration
import sql.test.TestLocalWeb.Person

class MySource3() extends SourceFunction[Person] {
  var i = 1

  override def run(ctx: SourceFunction.SourceContext[Person]): Unit = {
    while (true) {
      val person = Person(i, "hb")
      ctx.collect(person)
      i = i + 1
      Thread.sleep(1000)
    }
  }

  override def cancel(): Unit = {}
}

object TestLocalWeb extends App {
  case class Person(id: Int, name: String)

  var config = new Configuration()
  config.setBoolean(ConfigConstants.LOCAL_START_WEBSERVER, true)
  val env = StreamExecutionEnvironment.createLocalEnvironment(8, config)
  val source = env.addSource(new MySource3)
  source.print()

  env.execute()
}

问题:
程序运行起来后,并没有启动本地web界面,访问http://localhost:8081/ 不成功.