Spring Can't subscribe on system channel in Spring Websocket

Spring Websocket 5.3.5

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I'd like to subscribe to the system channel so I can leverage the RabbitMQ stomp /temp-queue/.
What I need is something like RabbitTemplate#sendAndReceive. But it seems Spring Webscoket drops all none recognized system channel messages

      if (!getSystemSubscriptions().containsKey(destination)) {
          if (logger.isDebugEnabled()) {
              logger.debug("Got message on \"system\" connection with no handler: " +
                      accessor.getDetailedLogMessage(message.getPayload()));
          }
          return;
      }

Since the destination is random I hope there's a chance that I can register a callback to handle all "no handler messages".

Thanks

Comment From: rstoyanchev

The StompBrokerRelayMessageHandler facilitates creating subscriptions and receiving messages on individual user sessions. The systemSubscriptions is mainly for internal use. In a multiple application server scenario, it allows app servers to be aware of all user sessions across all servers, and to forward user destination messages to the server(s) where user session(s) are active.

The systemSubscriptions are exposed for configuration, and you could register an additional destination/message handler pair there, and it will likely work, but it's not something we have designed for, and I'm not sure how well it fits what you're trying to do. For something very specific to RabbitMQ, perhaps you can also just use RabbitTemplate directly.

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