我在kotlin中使用redisson ExecutorService，但是发生了这样的异常，“ java.util.concurrent.RejectedExecutionException：任务被拒绝。ExecutorService处于关闭状态”。

class Runnabletask : Runnable,Serializable{
   private val redissonClient: RedissonClient? = null
   private var param: Long=0

   override fun run() {
      val atomic = redissonClient!!.getatomicLong("myAtomic")
      atomic.addAndGet(param)
      }

 }

fun main(args: Array<String>) {
  val config = Config()
  config.useSingleServer()
      .setaddress("redis://127.0.0.1:6379")
  val redisson = Redisson.create(config)

  val nodeConfig =   RedissonNodeConfig(config)   

  nodeConfig.setExecutorServiceWorkers(Collections.singletonmap("myExecutor",1))
  val node = RedissonNode.create(nodeConfig)
  node.start()
  val e = redisson.getExecutorService("myExecutor")
  e.execute(  Runnabletask())
  e.shutdown()
  node.shutdown()

}

我使用redisson 3.11.5。