CAMEL-20888 - Remove Kotlin DSL

[apupier]

Release Note

NONE

[oscerd]

Kotlin was supported even without the Kotlin DSL and long before the merge of that feature, so it shouldn't be removed from camel k

[squakez]

@oscerd indeed, Kotlin was originally developed as a language supported by the Camel K Runtime dependency only. However, lately we delegate the languages runtime aspects to the core, so, once it will be removed from core, then, it won't work in Camel K either.

@apupier I'd suggest that, before this change we introduce a deprecation notice as we are used to to with any feature we're willing to drop. Later we can remove the code.

[squakez]

The catalog is autogenerated and depends on Camel K Runtime. It should not be changed.

[apupier]

I removed changes to this file

[apupier]

@apupier I'd suggest that, before this change we introduce a deprecation notice as we are used to to with any feature we're willing to drop. Later we can remove the code.

the deprecation was announced with Camel 4.7 https://camel.apache.org/manual/camel-4x-upgrade-guide-4_7.html#_camel_kotlin_deprecation

[squakez]

@apupier I'd suggest that, before this change we introduce a deprecation notice as we are used to to with any feature we're willing to drop. Later we can remove the code.

the deprecation was announced with Camel 4.7 https://camel.apache.org/manual/camel-4x-upgrade-guide-4_7.html#_camel_kotlin_deprecation

Camel K is default to 4.4. Although the core deprecated this language some time ago, there was no Camel K. user that could have seen this. Next core default version will be likely 4.8. I suggest to add a deprecation notice in the upcoming version (2.5) and remove the feature from the next versions (>= 2.6) onward.

[apupier]

@apupier I'd suggest that, before this change we introduce a deprecation notice as we are used to to with any feature we're willing to drop. Later we can remove the code.

the deprecation was announced with Camel 4.7 https://camel.apache.org/manual/camel-4x-upgrade-guide-4_7.html#_camel_kotlin_deprecation

Camel K is default to 4.4. Although the core deprecated this language some time ago, there was no Camel K. user that could have seen this. Next core default version will be likely 4.8. I suggest to add a deprecation notice in the upcoming version (2.5) and remove the feature from the next versions (>= 2.6) onward.

I have not found a migration documentation or changelog specific to Camel K. Can you point me to the expected place?
Or you meant to mark the deprecation in the codebase and kotlin documentation is enough?

Kotlin DSL was marked as experimental so I think it can potentially be removed whenever we want. But it is fine to do the extra effort to maintain that in Camel K if it is still based on Camel 4.8 for some time which will contain still the Kotlin DSL.

[squakez]

@apupier we typically takes care of deprecation aspects directly setting the Integration condition. I think in this case you can do that in the Quarkus trait, reporting another condition as done for other fields:

camel-k/pkg/trait/quarkus.go

Line 143 in fefa0e7

condition := t.adaptDeprecatedFields()

[apupier]

raised #5837 as i do not have an environment ready for go development