java.net.BindException: Address already in use
	at sun.nio.ch.Net.bind0(Native Method)
	at sun.nio.ch.Net.bind(Net.java:444)
	at sun.nio.ch.Net.bind(Net.java:436)
	at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:214)
	at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
	at io.netty.channel.socket.nio.NioServerSocketChannel.doBind(NioServerSocketChannel.java:124)
	at io.netty.channel.AbstractChannel$AbstractUnsafe.bind(AbstractChannel.java:476)
	at io.netty.channel.DefaultChannelPipeline$HeadHandler.bind(DefaultChannelPipeline.java:1000)
	at io.netty.channel.DefaultChannelHandlerContext.invokeBind(DefaultChannelHandlerContext.java:463)
	at io.netty.channel.DefaultChannelHandlerContext.bind(DefaultChannelHandlerContext.java:448)
	at io.netty.channel.DefaultChannelPipeline.bind(DefaultChannelPipeline.java:842)
	at io.netty.channel.AbstractChannel.bind(AbstractChannel.java:195)
	at io.netty.bootstrap.AbstractBootstrap$2.run(AbstractBootstrap.java:338)
	at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:370)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:353)
	at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116)
	at java.lang.Thread.run(Thread.java:745)