at sun.nio.ch.Net.bind(Net.java:336)
        at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:199)
        at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
        at io.netty.channel.socket.nio.NioServerSocketChannel.doBind(NioServerSocketChannel.java:98)
        at io.netty.channel.AbstractChannel$AbstractUnsafe.bind(AbstractChannel.java:646)
        at io.netty.channel.DefaultChannelPipeline$HeadHandler.bind(DefaultChannelPipeline.java:1296)
        at io.netty.channel.DefaultChannelHandlerContext.invokeBind0(DefaultChannelHandlerContext.java:1026)
        at io.netty.channel.DefaultChannelHandlerContext.invokeBind(DefaultChannelHandlerContext.java:1012)
        at io.netty.channel.DefaultChannelHandlerContext.bind(DefaultChannelHandlerContext.java:1006)
        at io.netty.channel.DefaultChannelPipeline.bind(DefaultChannelPipeline.java:1072)
        at io.netty.channel.AbstractChannel.bind(AbstractChannel.java:250)
        at io.netty.bootstrap.AbstractBootstrap$2.run(AbstractBootstrap.java:332)
        at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:328)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:331)
        at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:109)
        at java.lang.Thread.run(Thread.java:722)
end