Github user franz1981 commented on the pull request: https://github.com/apache/activemq-artemis/commit/dfa70680fed37d25aa3a6d0d6a0795e580495b6a#commitcomment-31769915 No need to synchronize it: `stores` is a concurrent hashmap and you can use the atomic `computeIfAbsent` that use a lambda to populate the map
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