java NIO异常问题

java NIO运行时异常
服务器已开启，端口号12345

java.nio.channels.NotYetConnectedException
    at sun.nio.ch.SocketChannelImpl.ensureWriteOpen(Unknown Source)
    at sun.nio.ch.SocketChannelImpl.write(Unknown Source)
    at com.java.io.NIO.ClientHandle.doWrite(ClientHandle.java:130)
    at com.java.io.NIO.ClientHandle.sendMsg(ClientHandle.java:139)
    at com.java.io.NIO.Client.sendMsg(Client.java:25)
    at com.java.io.NIO.Test.main(Test.java:10)
java.lang.IllegalArgumentException
    at java.nio.channels.spi.AbstractSelectableChannel.register(Unknown Source)
    at java.nio.channels.SelectableChannel.register(Unknown Source)
    at com.java.io.NIO.ClientHandle.doConnect(ClientHandle.java:134)
    at com.java.io.NIO.ClientHandle.run(ClientHandle.java:46)
    at java.lang.Thread.run(Unknown Source)

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贴出代码，看exception很难猜出来是什么原因