Example examples/features/ha/colocated-failover-scale-down is not acknowledging all received messages

         // Step 10. Receive and acknowledge all of the sent messages, notice that they will be out of order, this is
         // because they were initially round robined to both nodes then when the server failed were reloaded into the
         // live server.
         TextMessage message0 = null;
         for (int i = 0; i < numMessages * 2; i++) {
            message0 = (TextMessage) consumer.receive(5000);
            if (message0 == null) {
               throw new IllegalStateException("Message not received!");
            }
            System.out.println("Got message: " + message0.getText());
         }
         message0.acknowledge();