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https://issues.apache.org/jira/browse/CAMEL-19837?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17762121#comment-17762121
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Jiri Ondrusek commented on CAMEL-19837:
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FYI ^ [~orpiske]
> Converters - unpredictable behavior linked to type hierarchy (flatpack)
> -----------------------------------------------------------------------
>
> Key: CAMEL-19837
> URL: https://issues.apache.org/jira/browse/CAMEL-19837
> Project: Camel
> Issue Type: Bug
> Components: core
> Affects Versions: 4.x
> Reporter: Jiri Ondrusek
> Priority: Major
>
> Consequence of
> [https://github.com/apache/camel/pull/11225/commits/e4007f2b1dfc982e5ea6a45427cbec8835ea58a5]
>
> Camel-flatpack registers 2 converters:
> # from net.sf.flatpack.DataSet to Map
> # from net.sf.flatpack.Record to Map
> Problematic case: If data for conversion is instance of
> net.sf.flatpack.DefaultDataSet
>
> Direct conversion is not possible (there is no DefaultDataSet -> Map
> converter)
> therefore matching via interface is used (see
> [https://github.com/apache/camel/blob/main/core/camel-api/src/main/java/org/apache/camel/converter/TypeConvertible.java#L101-L110)]
>
> Problem is that `DefaultDataSet` implements `DataSet`, which extends `Record`.
>
> Therefore based on the order of converters in the cache (map), "random"
> converter is selected and used. Unfortunately one of these selection might
> cause a problem.
>
> I was trying to run test `fixedHeaderAndTrailerShouldSucceed` in
> camel-quarkus from branch `camel-main`.
> [code|https://github.com/apache/camel-quarkus/blob/camel-main/integration-tests/flatpack/src/test/java/org/apache/camel/quarkus/component/flatpack/it/FlatpackTest.java#L133]
> # In case that converter `DataSet` -> `Map` is selected, the test
> {*}succeeds{*}.
> # If `Record` -> `Map` is selected, test {*}fails{*}.
>
> I'd suggest to add a logic, which takes into consideration the fact, that
> some of the matched interfaces are more general and some are more specific
> (in this case, `DataSet` conversion should have higher priority).
> There might be other approaches, but ^^ this one makes sense and should be
> implementable (I'm not sure about possible performance affect)
>
> (another way might be defining order of the converters, `DataSet` is always
> tried before `Record` in Flatpack, performance should be better)
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