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    <p>RabbitMQ discards messages if their routing key doesn't match any queues bound to the exchange. When you start <code>MQSender</code> first, no queues are bound, so the messages it sends are lost. When you start <code>MQReceiver</code>, it binds queues to the exchange, so RabbitMQ has a place to put the message from <code>MQSender</code>. When you stop MQReceiver, since you created an anonymous queue, the queue and all bindings are removed from the exchange.</p> <p>If you want messages to be stored on the server while <code>MQReceiver</code> is not running, you need the receiver to create a named queue, and bind the routing keys to that queue. Note that creating a named queue is idempotent, and the queue won't be created if it already exists. Then you need the receiver to pull messages off the named queue. </p> <p>Change your code to look something like this:</p> <p><strong>MQSender</strong></p> <pre><code>.... String namedQueue = "logqueue"; //declare named queue and bind log level routing keys to it. //RabbitMQ will put messages with matching routing keys in this queue channel.queueDeclare(namedQueue, false, false, false, null); for (int level = 0; level &lt; LOG_LEVELS.length; level++) { channel.queueBind(namedQueue, EXCHANGE_NAME, LOG_LEVELS[level]); } ... </code></pre> <p><strong>MQReceiver</strong></p> <pre><code>... channel.exchangeDeclare(EXCHANGE_NAME, "direct"); QueueingConsumer consumer = new QueueingConsumer(channel); //Consume messages off named queue instead of anonymous queue String namedQueue = "logqueue"; channel.basicConsume(namedQueue, true, consumer); while(true) { ... </code></pre>
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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