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Question 26

You are working with JMS publish-subscribe operations.

What happens when a producer publishes a message to a topic for which a durable subscription exists but there are no subscribers available?

The publisher waits for a subscriber, who then consumes it. However, the publisher will time out if no consumer arrives within the given timeout period.

The publisher sends the message. However, it is never consumed because there wasn't anything listening when it arrived, regardless of the message timeout length.

The publisher successfully sends a message, which will be consumed later, once there is a subscriber, assuming the message hasn't timed out.

The message publisher is immediately notified about the lack of subscribers and can decide for itself if, and when, to resend.

Correct Answer: C

When a producer publishes a message to a topic with a durable subscription and no subscribers are available, the message is successfully sent and will be held by the topic. It will be consumed later when a subscriber connects, provided that the message has not expired. This ensures that the subscribers don’t miss any messages even if they were temporarily offline.

Discussion

orjavaOption: C

Answer C