spring - Java RabbitMQ consumer.nextMessage always gets same message -


we using java rabbitmq spring boot in distributed service architecture. 1 service gets http request , forwards unkown queue processing. @ same time has wait response on queue before can terminate http request. (it's preview request gets work done renderer).

there can more 1 instance of servicea (the http interface) , serviceb (the renderer) every preview message send unique id used routing key.

i'm having trouble blockingconsumer. whenever call consumer.nextmessage() same message on , on again. doubly weird, 1 should acked , removed queue , consumer shouldn't bother unique id used no longer bound queue. nextmessage returns before renderer service done , has sent done message back.

here's simplified setup:

general

all services use global directexchange messages 

@bean   public directexchange globaldirectexchange() {     return new directexchange(exchange_name, false, true);   }

servicea (handles http request): 

 private content requestpreviewbykey(rendermessage rendermessage, string previewkey) {     string renderdoneroutingkey= uuid.randomuuid().tostring();     rendermessage.setpreviewdonekey(renderdoneid);     binding binding = bindingbuilder.bind(previewdonequeue).to(globaldirectexchange)         .with(renderdoneroutingkey);     try {       amqpadmin.declarebinding(binding);       rabbitproducer.sendpreviewrequesttokey(rendermessage, previewkey);       return getcontentblocking();     } catch (exception e) {       logerrorifdebug(type, e);       throw new apiexception(baseerrorcode.communication_error, "could not render preview");     } {       amqpadmin.removebinding(binding);     }   }     private content getcontentblocking() {     blockingqueueconsumer blockingqueueconsumer = new blockingqueueconsumer(rabbitmqconfig.connectionfactory(), new defaultmessagepropertiesconverter(), new activeobjectcounter<>(), acknowledgemode.auto, true, 1, preview_done_queue);     try {       blockingqueueconsumer.start();       message message = blockingqueueconsumer.nextmessage(waitforpreviewms);       if (!stringutils.isempty(message)) {         string result = new string(message.getbody());         return jsonutils.stringtoobject(result, content.class);       }           throw new apiexception("could not render preview");     } catch (exception e) {       logerror(e);       throw new apiexception("could not render preview");     } {       blockingqueueconsumer.stop();     }

}

service b

i'll spare of code. log says going , done service sends correct message uuid key sent initial render request. 

public void sendpreviewdonemessage(content content, string previewdonekey) {     string message = jsonutils.objecttostring(content);     rabbittemplate.convertandsend(globaldirectexchange, previewdonekey, message); }

the whole thing works... once... real issues seems consumer setup. why keep getting same (first) message queue when use nextmessage(). doesn't creating , removing bindung ensure, messages bound routingkey received in instance? , doesn't nextmessage() acknowledge message , remove queue?!

thank's lot bearing me , more helpful answer!

blockingqueueconsumer not designed used directly; component of simplemessagelistenercontainer, take care of acking message after has been consumed listener (the container calls commitifnecessary).

there may other unexpected side effects of using consumer directly.

i advise using listener container consume messages.

if want receive messages on demand, use rabbittemplate receive() or receiveandconvert() method instead.


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