Self-made event dispatcher

In my current project, we are using an event-based architecture in order to communicate between systems. The events are implemented as JMS messages, which we send over an ActiveMQ broker. Each system sends and listens to multiple events. While sending events is pretty easy, on the listener side we quickly ended up with a class […]

Messages vs. Events vs. Commands

In a distributed environment, services must communicate with each other. One of the most popular ways of communication is messaging. Tools like ActiveMQ, RabbitMQ or Kafka are making it easy to exchange messages between systems. But no matter which broker you are using, you must decide which kind of message you want to send. Messages […]

Effective error handling for ActiveMQ topics

No matter what type of software you make, there will always be errors. There might be bugs in your code or an external system is just down at the moment. No matter what it is, it will cause you trouble. Asynchronous messaging (with JMS) might help to deal with such situations. Especially when you depend […]

Virtual Topics in ActiveMQ

A couple of days ago I published a post about the difference between queues, topics and virtual topics. Today I want to share some practical information on how to use virtual topics in ActiveMQ with Spring Boot. Virtual Topics Virtual topics are a combination of topics and queues. Producers will write messages to a topic […]

Queues vs. Topics vs. Virtual Topics (in ActiveMQ)

ActiveMQ provides a variety of different messaging patterns. While queues and topics are the most famous ones, virtual topics can combine the best of both worlds: multiple consumers with their own dedicated queue. Queues Queues are the most obvious messaging pattern implemented by ActiveMQ. They provide a direct channel between a producer and a consumer. […]