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java.util.concurrent.RejectedExecutionException: Worker has already been shutdown	at org.jboss.netty.channel.socket.nio.AbstractNioSelector.registerTask(AbstractNioSelector.java:115)	at org.jboss.netty.channel.socket.nio.AbstractNioWorker.executeInIoThread(AbstractNioWorker.java:73)	at org.jboss.netty.channel.socket.nio.NioWorker.executeInIoThread(NioWorker.java:36)	at org.jboss.netty.channel.socket.nio.AbstractNioWorker.executeInIoThread(AbstractNioWorker.java:57)	at org.jboss.netty.channel.socket.nio.NioWorker.executeInIoThread(NioWorker.java:36)	at org.jboss.netty.channel.socket.nio.AbstractNioChannelSink.execute(AbstractNioChannelSink.java:34)	at org.jboss.netty.channel.Channels.fireExceptionCaughtLater(Channels.java:496)	at org.jboss.netty.channel.AbstractChannelSink.exceptionCaught(AbstractChannelSink.java:46)	at org.jboss.netty.handler.codec.oneone.OneToOneEncoder.handleDownstream(OneToOneEncoder.java:54)	at org.jboss.netty.channel.Channels.disconnect(Channels.java:781)	at org.jboss.netty.channel.AbstractChannel.disconnect(AbstractChannel.java:211)	at akka.remote.transport.netty.NettyTransport$$anonfun$gracefulClose$1.apply(NettyTransport.scala:222)	at akka.remote.transport.netty.NettyTransport$$anonfun$gracefulClose$1.apply(NettyTransport.scala:221)	at scala.util.Success.foreach(Try.scala:205)	at scala.concurrent.Future$$anonfun$foreach$1.apply(Future.scala:204)	at scala.concurrent.Future$$anonfun$foreach$1.apply(Future.scala:204)	at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:32)	at akka.dispatch.BatchingExecutor$Batch$$anonfun$run$1.processBatch$1(BatchingExecutor.scala:67)	at akka.dispatch.BatchingExecutor$Batch$$anonfun$run$1.apply$mcV$sp(BatchingExecutor.scala:82)	at akka.dispatch.BatchingExecutor$Batch$$anonfun$run$1.apply(BatchingExecutor.scala:59)	at akka.dispatch.BatchingExecutor$Batch$$anonfun$run$1.apply(BatchingExecutor.scala:59)	at scala.concurrent.BlockContext$.withBlockContext(BlockContext.scala:72)	at akka.dispatch.BatchingExecutor$Batch.run(BatchingExecutor.scala:58)	at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:42)	at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:386)	at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)	at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)	at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)	at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)