50 ActiveMQ interview questions frequently asked in MNCs

ActiveMQ Interview Questions (Beginner to Advanced)

Basic Concepts

1. What is ActiveMQ? Describe its purpose.
2. What are the major use cases of ActiveMQ in enterprise applications?
3. What is JMS and how is ActiveMQ related to JMS?
4. What are the core components of ActiveMQ? (Broker, Producer, Consumer, Destination)
5. What is a Message Broker? How is it implemented in ActiveMQ?
6. What messaging models are supported by ActiveMQ (e.g., P2P and Pub/Sub)?
7. Explain the difference between a Queue and a Topic in ActiveMQ.
8. What protocols does ActiveMQ support? (OpenWire, AMQP, MQTT, STOMP, etc.)
9. What is KahaDB in ActiveMQ?
10. How does ActiveMQ achieve message persistence?

Intermediate Level

11. What is the role of ConnectionFactory in ActiveMQ?
12. How do you configure a JMS connection in ActiveMQ?
13. What are persistent and non-persistent messages? When would you use each?
14. Explain the concept of prefetch policy in ActiveMQ.
15. How does message acknowledgement work in ActiveMQ?
16. What is the purpose of Dead Letter Queue (DLQ) in ActiveMQ?
17. How can ActiveMQ be monitored for performance and health?
18. What is message priority and how is it handled?
19. How do you browse messages in a queue?
20. What is the use of the ActiveMQ Web Console?

Advanced Functional Questions

21. Describe ActiveMQ clustering and network of brokers.
22. How does ActiveMQ handle load balancing and failover?
23. What are advisory messages in ActiveMQ?
24. Explain message redelivery policies.
25. What is flow control in ActiveMQ?
26. How does ActiveMQ support transactions?
27. What is durable subscription?
28. How do you tune ActiveMQ for high throughput?
29. What considerations are needed for high availability (HA) in ActiveMQ?
30. How do you configure persistence adapters? (e.g., JDBC, KahaDB)

Spring & Integration Related

31. How do you integrate ActiveMQ with Spring Boot?
32. Explain @JmsListener and related Spring annotations.
33. How do you send messages to ActiveMQ using Spring?
34. How can ActiveMQ be used with Apache Camel?
35. How do you configure message converters in Spring with ActiveMQ?

Real-World / Scenario Questions

36. How would you fix a backlog in queues?
37. If messages are stuck in DLQ, how would you troubleshoot?
38. How do you ensure transactional messaging across services?
39. Describe how you would migrate from another broker (e.g., RabbitMQ) to ActiveMQ.
40. How to handle slow consumers in a queue?

Performance & Tuning

41. What tuning parameters affect ActiveMQ throughput?
42. How can you improve consumer concurrency?
43. What is message batching? Does ActiveMQ support it?
44. How do you measure ActiveMQ performance metrics in production?
45. What are best practices to reduce broker memory usage?

Comparisons & Design

46. Compare ActiveMQ with other messaging systems like Kafka and RabbitMQ.
47. When would you choose ActiveMQ over Kafka?
48. What are the challenges when scaling ActiveMQ horizontally?
49. Explain how ActiveMQ fits into microservices architecture.
50. What design considerations matter when building event-driven solutions with ActiveMQ?

Tips for ActiveMQ Interview Preparation

• Be clear on basic JMS concepts like Queues, Topics, Persistent vs Non-Persistent, Acknowledgements.
• Know broker configuration & monitoring (console, JMX).
• Practice Spring + ActiveMQ integration with sample code.
• Prepare real-world scenarios like troubleshooting, tuning, and scaling.