[rabbitmq-discuss] PRECONDITION_FAILED question

Tue Nov 12 18:11:16 GMT 2013

Hi, MK! Thanks for your post.
I wrote a code without my library, here is:

    public void TestCode()
    {
      const string exchange = "x-nunit";
      const string key = "key";
      const string queue = "nunit-queue";

      ConnectionFactory factory = new ConnectionFactory {Uri =
"amqp://guest:guest@127.0.0.1:5672/%2F"};
      IConnection connection = factory.CreateConnection();
      IModel channel = connection.CreateModel();

      channel.ExchangeDeclare(exchange, ExchangeType.Direct);
      channel.QueueDeclare(queue, true, false, false, null);
      channel.QueueBind(queue, exchange, key);

      try
      {
        channel.ExchangeDelete(exchange, true);
      }
      catch (Exception e)
      {
        System.IO.File.AppendAllText(@"F:\error.log", e.Message);
      }

      try
      {
        channel.QueueUnbind(queue, exchange, key, null);
      }
      catch (Exception e)
      {
        System.IO.File.AppendAllText(@"F:\error.log", e.Message);
      }

      channel.Close();
      connection.Close();
    }

F:\error.log:
The AMQP operation was interrupted: AMQP close-reason, initiated by Peer,
code=406, text="PRECONDITION_FAILED - exchange 'x-nunit' in vhost '/' in
use", classId=40, methodId=20, cause=
The AMQP operation was interrupted: AMQP close-reason, initiated by Peer,
code=406, text="PRECONDITION_FAILED - exchange 'x-nunit' in vhost '/' in
use", classId=40, methodId=20, cause=

RabbitMQ log:
=INFO REPORT==== 12-Nov-2013::19:58:26 ===
accepting AMQP connection <0.30470.9> (xxx:9421 -> yyy:5672)

=ERROR REPORT==== 12-Nov-2013::19:58:27 ===
connection <0.30470.9>, channel 1 - soft error:
{amqp_error,precondition_failed,"exchange 'x-nunit' in vhost '/' in use",
            'exchange.delete'}

=INFO REPORT==== 12-Nov-2013::19:58:28 ===
closing AMQP connection <0.30470.9> (xxx:9421 -> yyy:5672)

But when I'm changing 'try/catch' vice-versa everything looks fine.

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