I have used couple of days trying to find simple example of how to implement a JMS client with minimum possible number of dependencies.
In internet you can find tons of examples. But Spring Boot examples exclusively use local broker. Most of them have ActiveMQ or RabbitMQ starter dependency & nothing else.
I can see that this is a kind of "general question" that Stack Overflow doesn't like, but I can not figure out were to go. No help from Spring docs either.
And I am sure there not very many lines of code are needed if you just know what to do!
EDIT: I just want a JMS listener.
Related
I am trying to implement activemq(just want to receive messages) with spring integration.I cant find any clues how to provide java configuration for activemq. What are the minimum required components for job. Somewhere we have channel, adapter somewhere we dont. I am unable to understand spring concepts of adapter, channel and service activator. They are all feeling same to me. I find the integration documentation going above my head. I never had problems with understanding other spring modules(boot, mvc, cloud, batch). Can someone point me in the right direction or what is it that I am doing wrong.
You probably are missing the fact that Spring Integration is a reference implementation for well-known Enterprise Integration Patterns. So, please, consider to start from the theory and ideas. Then you can come back to Spring Integration as an API for those EIP. See respective book on the matter: https://www.enterpriseintegrationpatterns.com.
To read messages from JMS destination you need to use a JmsMessageDrivenEndpoint with respective ConnectionFactory injected.
There is nothing more about that than an ActiveMQConnectionFactory as a bean.
For example in tests we do like this:
new ActiveMQConnectionFactory("vm://localhost?broker.persistent=false")
And an in-memory broker is started.
See a test class with Java DSL for some way how to configure JMS components: https://github.com/spring-projects/spring-integration/blob/master/spring-integration-jms/src/test/java/org/springframework/integration/jms/dsl/JmsTests.java
The Spring Boot documentation has this very brief illustration of an embedded JMS server: "Two beans that you don’t see defined are JmsTemplate and ConnectionFactory. These are created automatically by Spring Boot. In this case, the ActiveMQ broker runs embedded." Huh? The Reference Documentation doesn't say a thing about it. I need to create two VMs, each running from its own jar file, and I need one of them to launch an embedded JMS server, but I have no idea how to do this. Can somebody point me in the right direction. (If you provide a link, I would prefer some clear documentation over an example, but I'll be happy with a good example.)
You are looking at the wrong reference documentation. Yours is from Spring Integration.
The one of Spring Boot can be found here:
https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#boot-features-activemq
And there you will find the answer:
When ActiveMQ is available on the classpath, Spring Boot can also
configure a ConnectionFactory. If the broker is present, an embedded
broker is automatically started and configured (provided no broker URL
is specified through configuration).
I've been roaming the depths of the internet but I find myself unsatisfied by the examples I've found so far. Can someone point me or, show me, a good starting point to integrate zipkin tracing with jaxrs clients and amqp clients?
My scenario is quite simple and I'd expect this task to be trivial tbh. We have a micro services based architecture and it's time we start tracing our requests and have global perspective of our inter service dependencies and what the requests actually look like (we do have metrics but I want more!) . The communication is done via jax-rs auto generated clients and we use rabbit template for messaging.
I've seen brave integrations with jaxrs but they are a bit simplistic. My zipkin server is a spring boot mini app using stream-rabbit, so zipkin data is sent using rabbitmq.
Thanks in advance.
After some discussion with Marcin Grzejszczak and Adrien Cole (zipkin and sleuth creators/active developers) I ended up creating a Jersey filter that acts as bridge between sleuth and brave. Regarding AMQP integration, added a new #StreamListener with a conditional for zipkin format spans (using headers). Sending messages to the sleuth exchange with zipkin format will then be valid and consumed by the listener. For javascript (zipkin-js), I ended up creating a new AMQP Logger that sends zipkin spans to a determined exchange. If someone ends up reading this and needs more detail, you're welcome to reach out to me.
I've looked everywhere and I cannot find out how to get these two to work using transactions. I can find examples with Spring, Camel, ActiveMQ and transactions but never with RabbitMQ.
If you are using the current RabbitMQ Camel Component that feature is not implemented. If you really want to use transactions with RabbitMQ and Camel, you will need to change the code to allow the component to do this.
The exact you would need to modify would be this one around the channel.basicPublish() call.
I am a new bie to the world of Spring JMS, I have read the manning Spring in action particular for JMS, I have also gone with through this url and it helped me lot.I have also gone through the official spring reference and discovers the JMS templates also, Now my query is could you please advise me some more urls so that when, I am going to build a small first application which will put data in queue and another app will read data from that queue, so I will be using Active MQ, please share some url and examples to grasp more and that will help me to build the application and explore the world of spring JMS.
Thanks in advance
Follow these links in order:
Using spring to send jms messages
Using spring to receive jms messages
Tuning jms message consumption in spring
Creating robust jms application