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https://issues.apache.org/jira/browse/AMQ-8299?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17362912#comment-17362912
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Piotr Klimczak commented on AMQ-8299:
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Thanks for comment, just found same spec myself. Shame.
> ActiveMQMapMessage data corruption- should use LinkedHashMap to preserve
> original order
> ---------------------------------------------------------------------------------------
>
> Key: AMQ-8299
> URL: https://issues.apache.org/jira/browse/AMQ-8299
> Project: ActiveMQ
> Issue Type: Bug
> Components: JMS client
> Affects Versions: 5.16.2
> Reporter: Piotr Klimczak
> Priority: Major
>
> The core principle of messaging system is that payload sent by producer is
> received exactly same (unmodified) on consumer side.
> However due to ActiveMQMapMessage using HashMap for map data, the order of
> entries is not guaranteed effectively causing data corruption.
> This is especially true when we are sending LinkedHashMap on producer side.
> Then the consumer side will receive out of order data.
> This is not newly introduced bug, looks like it is there for many years-
> surprisingly.
> From what I have seen in client implementation, it is perfectly ready to work
> with LinkedHashMap. So it might be just one line change to fix + test
> coverage.
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