com.rabbitmq.client.AlreadyClosedException: clean connection shutdown; reason: Attempt to use closed

场景：rabbitMQ生产者发布消息。

代码【java】：

channel.basicPublish("exchangeTest111", "testQueue1", null, "hahaha".getBytes());

产生异常：

com.rabbitmq.client.AlreadyClosedException: clean connection shutdown; reason: Attempt to use closed channel
    at com.rabbitmq.client.impl.AMQChannel.ensureIsOpen(AMQChannel.java:190)
    at com.rabbitmq.client.impl.AMQChannel.transmit(AMQChannel.java:291)
    at com.rabbitmq.client.impl.ChannelN.basicPublish(ChannelN.java:634)
    at com.rabbitmq.client.impl.ChannelN.basicPublish(ChannelN.java:617)
    at com.rabbitmq.client.impl.ChannelN.basicPublish(ChannelN.java:608)
    at rabbitMQ.Sender.main(Sender.java:52)

异常原因：channel被关闭。因为向一个不存在的exchange发消息。

其他可能产生channel被关闭的原因请参考：http://stackoverflow.com/questions/8839094/why-do-my-rabbitmq-channels-keep-closing