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https://issues.apache.org/jira/browse/ARTEMIS-583?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Justin Bertram closed ARTEMIS-583.
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Resolution: Not A Problem
Assignee: Justin Bertram
This is an implementation detail of topics. Artemis doesn't have an internal
idea of a "topic" per se. It just has addresses and queues. However, in JMS
there is an idea of a topic without a subscription and the queue that is
created here essentially represents that.
> Suprious queue created along with topic
> ---------------------------------------
>
> Key: ARTEMIS-583
> URL: https://issues.apache.org/jira/browse/ARTEMIS-583
> Project: ActiveMQ Artemis
> Issue Type: Bug
> Reporter: Lionel Cons
> Assignee: Justin Bertram
>
> This is probably a consequence of ARTEMIS-412.
> When using STOMP to send a message to a non-existing topic (here
> {{jms.topic.test}}), the matching Address object is created:
> {code}
> "org.apache.activemq.artemis:brokerName=\"artemis\",module=Core,name=\"jms.topic.test\",serviceType=Address,type=Broker"
> : {
> "Address" : "jms.topic.test",
> "AddressSize" : 0,
> "BindingNames" : [
> "jms.topic.test"
> ],
> "NumberOfBytesPerPage" : 1048576,
> "NumberOfMessages" : 0,
> "NumberOfPages" : 0,
> "Paging" : false,
> "QueueNames" : [
> "jms.topic.test"
> ],
> "Roles" : [
> [
> "administrators",
> true,
> true,
> true,
> true,
> true,
> true,
> true
> ]
> ],
> "RolesAsJSON" :
> "[{\"createDurableQueue\":true,\"createNonDurableQueue\":true,\"name\":\"administrators\",\"deleteNonDurableQueue\":true,\"consume\":true,\"send\":true,\"deleteDurableQueue\":true,\"manage\":true}]"
> },
> {code}
> So far, so good.
> However, I also see an eponymous Queue object being created, with a weird
> Filter.
> {code}
> "org.apache.activemq.artemis:address=\"jms.topic.test\",brokerName=\"artemis\",module=Core,name=\"jms.topic.test\",serviceType=Queue,type=Broker"
> : {
> "Address" : "jms.topic.test",
> "ConsumerCount" : 0,
> "DeadLetterAddress" : "jms.queue.DLQ",
> "DeliveringCount" : 0,
> "Durable" : true,
> "ExpiryAddress" : "jms.queue.ExpiryQueue",
> "Filter" : "__AMQX=-1",
> "FirstMessageAsJSON" : "[{}]",
> "FirstMessageTimestamp" : null,
> "ID" : 6,
> "MessageCount" : 0,
> "MessagesAcknowledged" : 0,
> "MessagesAdded" : 0,
> "Name" : "jms.topic.test",
> "Paused" : false,
> "ScheduledCount" : 0,
> "Temporary" : false
> },
> {code}
> I don't see why this would be needed.
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