title: RabbitMQ authentication without password
body: <p>Because I don't need to consider security issues in my application, I want to connect to RabbitMQ using the Java client without a password. </p>
  
  <p>In the management UI, I set the users password to "no password". Then I tried it this way:</p>
  
  <pre><code>ConnectionFactory factory = new ConnectionFactory();
  factory.setHost("localhost");
  factory.setUsername("myuser");
  connection = factory.newConnection();
  </code></pre>
  
  <p>Alternatively, I tried to assemble the URI by hand:</p>
  
  <pre><code>factory.setUri("amqp://myuser@localhost:5672");
  </code></pre>
  
  <p>...but in both cases the authentication fails with this exception:</p>
  
  <pre><code>Exception in thread "main" com.rabbitmq.client.AuthenticationFailureException: ACCESS_REFUSED - Login was refused using authentication mechanism PLAIN. For details see the broker logfile.
      at com.rabbitmq.client.impl.AMQConnection.start(AMQConnection.java:339)
      at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:716)
      at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:760)
      at de.bmw.rabbitmq.workerqueue.Producer2.main(Producer2.java:51)
  </code></pre>
  
  <p>Is it even possible to get a connection without a password?</p>