How to use RabbitMQ message broker in Java application? I have not found any document or link to understand how to do it.
There's plenty or RabbitMQ documentation.
In particular, you may be interested in the Java client API guide and the javadocs.
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I'm kind of new to these protocols, and just started exploring Message brokers like Apache Apollo and RabbitMQ.
So my broker receives MQTT messages from a publisher. And I would like to convert it into AMQP (preferably) or STOMP protocol to send to a web server. But I've so far been unable to do so.
I looked into RabbitMQ, and tried enabling the MQTT plugin, but when I do load it, I'm unable to start the server.
I was wondering if anyone can guide me here? Is there an API that can help me? And I'm very confused about RabbitMQ. I've been able to load other plugins easily,like stomp, management utilities etc.
I'm 100% sure it is doable. I am doing it right now with robomq.io broker. One cause could be sometimes bugs in your client library restrict you doing so.
Another thing you should be aware of is that internally, RabbitMQ MQTT adapter is mapped into amq.topic exchange by default, so on your STOMP peer, you should subscribe or send to /topic/yourTopic; on your AMQP peer, bind your queue to amq.topic exchange or publish to that exchange.
Follow this example code and documentation to build your client.
If you can't figure out your server, just get a free trial from robomq.io. It saves you time and money.
The development tool I am using is robomq.io broker, producers in Python (AMQP library: pika, MQTT library: paho, STOMP library: stompest), consumer in Node.js (library: amqplib).
Hope it helps!
Well, I'm not sure if this question should be taken down. But if it has to be I leave it to the discretion of the moderators and the stackOverflow community in general.
btw, I use Ubuntu 14.04.
About the RabbitMQ broker
So Mosquitto was running un the background occupying the port 1883 normally used for MQTT. I could have changed the port for RabbitMQ, but decided against it and tried to kill the Mosquitto process. But for some reason, I could NOT.
For now, my quick fix was removing Mosquitto completely and this freed the port, enabling RabbitMQ to use it.
About the protocols
I've used Paho and the RabbitMQ libraries provided to code out simple programs that can publish and receive messages in AMQP/MQTT via the RabbitMQ broker.
(My Googling needs to be better!)
Still haven't converted one to the other. But that shouldn't be too big a step to achieve.
Still would be nice to know if there's an API or something that can help me achieve the conversion in a very simple manner. Of course, if there's not, I'll figure it out ASAP
Any suggestions/comments are heartily welcome. I'm brand new to all this and could really use advice from all you seasoned pros :)
Can anyone point me to decent example where Java stomp client is used to connect to ActiveMQ.
Also I am interested in following:
Is failover supported over stomp?
How to create durable subscription?
Does stomp support asynchronous messaging? Examples? I think I have to implement MessageListener interface for it, but I wasn't able to find example for this.
If you really want to use STOMP from Java then you could look at StompJMS which maps quite a bit of the JMS API to STOMP. It doesn't support failover but there aren't a lot of stomp client's that do. When using Java you are better off to use the native JMS client from the ActiveMQ broker as it is going to be the most robust and feature complete client library you will find.
RabbitMQ supports multiple protocols, AMQP, MQTT, STOMP, ....
When using PHP for example, it's easier to publish using the STOMP library since the PHP AMQP libraries requires compiled C code and is somewhat of a mission to setup if you don't have to.
On the JAVA side, apache camel with AMQP on spring is pretty straight forward.
Is it possible to setup a queue, publish to it via STOMP and then consume via AMQP and then again publish via AMQP and consume via STOMP if the message broker is RabbitMQ?
Yes, this should work, given that you have installed RabbitMQ's STOMP plugin on your RabbitMQ node(s).
The protocol only defines the communication between client and server and has no impact on a message itself.
You should note that using protocols other than AMQP will most likely come along with limitations and/or worse performance.
There also exist native PHP libraries for RabbitMQ that don't require compiling C code. Unfortunately, I cannot tell you which one is the best, because I am a Java guy ;-).
Currently I am researching open source message broker technology that can provide support for ebXML I would like to use Apache ActiveMQ.
I will be looking at supporting Oasis ebXML AS4 specification.
My question is, does Apache ActiveMQ as a JMS broker offer adequate support for ebXML, in particular ebXML 3 AS4?
Are there any alternative open source message broker technology more suited to ebXML?
Lastly is there a .NET interface library to support ebXML support via ActiveMQ?
Thanks in advance,
Marcus
What do you mean by "support"?
Apache ActiveMQ is a messaging component. It does not really care about the content in the messages, but should merly be seen as a transport channel.
Apache Camel comes bundle with ActiveMQ do support XML (parsing, transforming), but not ebXML explicitly.
Typically, explicit support for these industry standard EDI formats are rarely implemented in open source middleware. There might be some old java library open source out there ( ebXml OpenSource java implementation ), but nothing very active, unfortunately.
In ActiveMQ, there is a concept called BrokerService. Normally for learning purposes, I am starting the broker from the command line using 'activemq' which starts the Broker.
What is the difference between starting the broker this way and using the BrokerService.start();
My guess is that when you use 'activemq' , the broker starts in its own jvm, when you use BrokerService.start(), the broker is using the existing JVM.
Is this correct?
Also, if someone can point to a resource that explains how the broker architecture is implemented in a traditional j2ee server like weblogic, that would be much appreciated.
I am mostly seeking clarification of how a broker can be deployed on a cluster?
Check out the ActiveMQ in action book. That is awesome and explains everything
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