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 blocke.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。