java.util.concurrent.RejectedExecutionException: event executor terminated解决方法之一

INFO   | jvm 1    | 2017/03/09 19:45:10 | java.util.concurrent.RejectedExecutionException: event executor terminated
INFO   | jvm 1    | 2017/03/09 19:45:10 |     at io.netty.util.concurrent.SingleThreadEventExecutor.reject(SingleThreadEventExecutor.java:805)
INFO   | jvm 1    | 2017/03/09 19:45:10 |     at io.netty.util.concurrent.SingleThreadEventExecutor.offerTask(SingleThreadEventExecutor.java:345)
INFO   | jvm 1    | 2017/03/09 19:45:10 |     at io.netty.util.concurrent.SingleThreadEventExecutor.addTask(SingleThreadEventExecutor.java:338)
INFO   | jvm 1    | 2017/03/09 19:45:10 |     at io.netty.util.concurrent.SingleThreadEventExecutor.execute(SingleThreadEventExecutor.java:745)
INFO   | jvm 1    | 2017/03/09 19:45:10 |     at io.netty.channel.AbstractChannel$AbstractUnsafe.invokeLater(AbstractChannel.java:877)
INFO   | jvm 1    | 2017/03/09 19:45:10 |     at io.netty.channel.AbstractChannel$AbstractUnsafe.deregister(AbstractChannel.java:682)
INFO   | jvm 1    | 2017/03/09 19:45:10 |     at io.netty.channel.AbstractChannel$AbstractUnsafe.fireChannelInactiveAndDeregister(AbstractChannel.java:642)
INFO   | jvm 1    | 2017/03/09 19:45:10 |     at io.netty.channel.AbstractChannel$AbstractUnsafe.close(AbstractChannel.java:625)
INFO   | jvm 1    | 2017/03/09 19:45:10 |     at io.netty.channel.AbstractChannel$AbstractUnsafe.close(AbstractChannel.java:554)
INFO   | jvm 1    | 2017/03/09 19:45:10 |     at io.netty.channel.DefaultChannelPipeline$HeadContext.close(DefaultChannelPipeline.java:1236)
INFO   | jvm 1    | 2017/03/09 19:45:10 |     at io.netty.channel.AbstractChannelHandlerContext.invokeClose(AbstractChannelHandlerContext.java:629)
INFO   | jvm 1    | 2017/03/09 19:45:10 |     at io.netty.channel.AbstractChannelHandlerContext.close(AbstractChannelHandlerContext.java:613)
INFO   | jvm 1    | 2017/03/09 19:45:10 |     at io.netty.channel.ChannelOutboundHandlerAdapter.close(ChannelOutboundHandlerAdapter.java:71)
INFO   | jvm 1    | 2017/03/09 19:45:10 |     at io.netty.channel.AbstractChannelHandlerContext.invokeClose(AbstractChannelHandlerContext.java:629)
INFO   | jvm 1    | 2017/03/09 19:45:10 |     at io.netty.channel.AbstractChannelHandlerContext.close(AbstractChannelHandlerContext.java:613)
INFO   | jvm 1    | 2017/03/09 19:45:10 |     at io.netty.channel.ChannelOutboundHandlerAdapter.close(ChannelOutboundHandlerAdapter.java:71)
INFO   | jvm 1    | 2017/03/09 19:45:10 |     at io.netty.channel.AbstractChannelHandlerContext.invokeClose(AbstractChannelHandlerContext.java:629)
INFO   | jvm 1    | 2017/03/09 19:45:10 |     at io.netty.channel.AbstractChannelHandlerContext.close(AbstractChannelHandlerContext.java:613)
INFO   | jvm 1    | 2017/03/09 19:45:10 |     at io.netty.channel.AbstractChannelHandlerContext.close(AbstractChannelHandlerContext.java:470)
INFO   | jvm 1    | 2017/03/09 19:45:10 |     at io.netty.channel.DefaultChannelPipeline.close(DefaultChannelPipeline.java:949)
INFO   | jvm 1    | 2017/03/09 19:45:10 |     at io.netty.channel.AbstractChannel.close(AbstractChannel.java:194)
INFO   | jvm 1    | 2017/03/09 19:45:10 |     at io.netty.channel.ChannelFutureListener$2.operationComplete(ChannelFutureListener.java:56)
INFO   | jvm 1    | 2017/03/09 19:45:10 |     at io.netty.channel.ChannelFutureListener$2.operationComplete(ChannelFutureListener.java:52)
INFO   | jvm 1    | 2017/03/09 19:45:10 |     at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:514)
INFO   | jvm 1    | 2017/03/09 19:45:10 |     at io.netty.util.concurrent.DefaultPromise.notifyListeners0(DefaultPromise.java:507)
INFO   | jvm 1    | 2017/03/09 19:45:10 |     at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:486)
INFO   | jvm 1    | 2017/03/09 19:45:10 |     at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:427)
INFO   | jvm 1    | 2017/03/09 19:45:10 |     at io.netty.util.concurrent.DefaultPromise.tryFailure(DefaultPromise.java:129)
INFO   | jvm 1    | 2017/03/09 19:45:10 |     at io.netty.channel.epoll.AbstractEpollStreamChannel$EpollStreamUnsafe.fulfillConnectPromise(AbstractEpollStreamChannel.java:821)
INFO   | jvm 1    | 2017/03/09 19:45:10 |     at io.netty.channel.epoll.AbstractEpollStreamChannel$EpollStreamUnsafe.finishConnect(AbstractEpollStreamChannel.java:840)

经仔细分析，是因为在创建socket失败的时候，shutdown了所属的EventLoopGroup所致，调整为shutdownGracefully()，问题即解决。