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https://issues.apache.org/jira/browse/ARTEMIS-4370?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Justin Bertram resolved ARTEMIS-4370.
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Resolution: Fixed
> Publishing message with existing topic alias and different topic causes
> message to be sent to incorrect topic
> -------------------------------------------------------------------------------------------------------------
>
> Key: ARTEMIS-4370
> URL: https://issues.apache.org/jira/browse/ARTEMIS-4370
> Project: ActiveMQ Artemis
> Issue Type: Bug
> Components: MQTT
> Affects Versions: 2.29.0
> Reporter: Adam Zyzak
> Assignee: Justin Bertram
> Priority: Major
> Fix For: 2.31.0
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> h3. Description
> When sending MQTT 5.0 publish message with topic alias number that has
> existing mapping for given connection and new topic, Artemis broker will
> incorrectly route message to topic from alias mapping instead of topic from
> publish message. This is incorrect behavior because broker should route
> message to topic from publish message and update alias mapping with new
> topic.
> Section 3.3.2.3.4 Topic Alias in MQTT 5.0 specification states the following:
> {code:java}
> A sender can modify the Topic Alias mapping by sending another PUBLISH in the
> same Network Connection with the same Topic Alias value and a different
> non-zero length Topic Name. {code}
>
> h3. Steps to reproduce
> # Create 2 MQTT subscribers: first on topic1 and second on topic2
> # Create 1 MQTT publisher
> # From publisher send publish message on topic1 with MQTT property
> TOPIC_ALIAS set to 1
> # From publisher send publish message on topic2 with MQTT property
> TOPIC_ALIAS set to 1
> h3. Current result
> First message is correctly routed to topic1, but second message is
> incorrectly routed to topic1 instead of topic2
> Method
> org.apache.activemq.artemis.core.protocol.mqtt.MQTTPublishManager#sendToQueue
> adds mapping only if alias does not exist
> h3. Expected result
> Topic field in MQTT publish should have priority over TOPIC_ALIAS property.
> Topic alias stored under existing alias number should be updated.
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