java.nio.channels.IllegalBlockingModeException

相关错误代码：

	class Handler {
		public Handler(Selector selector, SocketChannel socketChannel) throws InterruptedException {
			try {
				SelectionKey key = socketChannel.register(selector, SelectionKey.OP_READ);
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
//			while (true) {
//				System.out.println("Handler");
//				Thread.sleep(1000);
//			}
			
			socketChannelMap.put(socketChannel.hashCode(), socketChannel);
			
			System.out.println("Handler end" + socketChannel.hashCode() + "," + socketChannelMap.size());
		}
	}

发生错误语句：

SelectionKey key = socketChannel.register(selector, SelectionKey.OP_READ);

错误原因：

必须设置通道为 非阻塞，才能向 Selector 注册。

解决方法：

在发生错误的语句前添加：

socketChannel.configureBlocking(false);

注意参数值，false 为 非阻塞，true 为 阻塞。