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https://issues.apache.org/jira/browse/AMQ-8299?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Christopher L. Shannon closed AMQ-8299.
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Resolution: Invalid
It's a Map, the whole point is there is no ordering..it's key/value pairs and
not a list or something like that so there is no bug here or corruption.
There's no guarantee of order with a map so there's no reason to change
anything.
Look at: [https://docs.oracle.com/javaee/7/api/javax/jms/MapMessage.html]
{quote}A MapMessage object is used to send a set of name-value pairs. The names
are String objects, and the values are primitive data types in the Java
programming language. The names must have a value that is not null, and not an
empty string. The entries can be accessed sequentially or randomly by name.
*The order of the entries is undefined.* MapMessage inherits from the Message
interface and adds a message body that contains a Map.
{quote}
> 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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