Producer posts to topic and consumer subscribes to virtual topic

问题

We have a weird issue.

There are two equivalent topics: topicA and topicB.
The topics are created dynamically. Consumers subscribe to VirtualTopic.topicA and VirtualTopic.topicB correspondingly.

Consumers get the messages. We see equal number of arrived and dequeued messages in each virtual topic.

However, topicA says it has active subscribers, whereas topicB does not. All messages in topicA are dequeued. topicB shows the same number of messages as VirtualTopic.topicB contains, but none of the message is dequeued in topicB.

It looks like ActiveMQ just silently copies messages from regular to virtual topic. But it is not clear why it does it only for one of the topics.

Code which subscribes consumers is the same. Code that produces messages is the same. Configuration differs only in name of topics.

Can anyone give a hint what can define that difference in behaviour?

来源：https://stackoverflow.com/questions/53265279/producer-posts-to-topic-and-consumer-subscribes-to-virtual-topic