Direct exchange does not route messages when queues are bound with the # pattern

[joeljhou]

Describe the bug

When using a custom DirectExchange in RabbitMQ and binding a queue to it with the routing key #, the queue does not receive any messages, even though it should receive messages with any routing key.

Reproduction steps

1. Create a custom DirectExchange in RabbitMQ.
2. Bind a queue to this exchange using the routing key #.
3. Send a message to the exchange with any routing key.
4. Check if the message is received by the bound queue.

Expected behavior

Expected behavior
The queue should receive messages when binding it to the custom direct exchange with the routing key #, as # should match any routing key.

Actual behavior
The queue does not receive any messages when binding it with the routing key #.

Additional context

Example code

@Test
public void testSendMessageAndReceiveMessage() {
    // Declare the exchange
    rabbitAdmin.declareExchange(new DirectExchange("my.direct.exchange", true, false));

    // Declare the queue
    rabbitAdmin.declareQueue(new Queue("test.direct.queue", true));

    // Bind the queue to the custom direct exchange
    Binding binding = new Binding(
            "test.direct.queue", Binding.DestinationType.QUEUE,
            "my.direct.exchange", "#", null);
    rabbitAdmin.declareBinding(binding);

    // Send a message to the custom direct exchange
    rabbitTemplate.convertAndSend("my.direct.exchange", "random", "Hello, RabbitMQ!");

    // Receive the message
    Object directMessage = rabbitTemplate.receiveAndConvert("test.direct.queue");
    System.out.println("directMessage = " + directMessage);
}

This code snippet demonstrates the issue where the queue does not receive messages when binding it to the custom direct exchange with routing key #.

Here's the version information you provided:

• RabbitMQ Java Client: 5.21.0
• Spring Rabbit: 3.1.4

[joeljhou]

Results that do not meet expectations

directMessage = null

[michaelklishin]

You have chosen the wrong exchange type. You need a topic exchange and not a direct one.

[michaelklishin]

@joeljhou your expectations are not correct. Direct exchanges do not use patterns, topic exchanges do. See tutorial 5.

Direct exchanges technically can route to multiple queues if they are bound with the same exact routing key but they do not and never have supported patterns.