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https://issues.apache.org/jira/browse/AMQ-5298?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Timothy Bish resolved AMQ-5298.
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Resolution: Fixed
Fixed the NPE scenario. The issue with retained messages is not really related
to this code so a separate issue will be opened to cover that.
> MQTT Transport can generate class cast exception when subscription is to a
> Virtual Topic
> ----------------------------------------------------------------------------------------
>
> Key: AMQ-5298
> URL: https://issues.apache.org/jira/browse/AMQ-5298
> Project: ActiveMQ
> Issue Type: Bug
> Components: MQTT
> Affects Versions: 5.10.0
> Reporter: Timothy Bish
> Fix For: 5.11.0
>
>
> When a client subscribes to a Virtual Topic and sends a duplicate
> subscription request the method that resends the old retained messages tries
> to cast the destination from the TopicRegion is finds to a Topic but in this
> case it would be a VirtualTopicIntercepter and an exception is thrown
> disconnecting the client.
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