[KOTLIN-SPRING] fix: use spring-cloud-dependencies BOM in Spring Boot 4 spring-cloud pom

[zaenk]

Fixes #24325

The kotlin-spring spring-cloud pom-sb4.mustache template imports spring-cloud-starter-parent:2025.1.0 as a managed BOM. That artifact is not published on Maven Central for the 2025.1.x train (only -M*/-RC* exist), so projects generated with kotlin-spring + library: spring-cloud + useSpringBoot4=true fail dependency resolution at build time.

The correct, published importable BOM for this train is spring-cloud-dependencies (2025.1.0 GA, HTTP 200). The JavaSpring generator's equivalent spring-cloud/pom-sb4.mustache already uses spring-cloud-dependencies — this PR aligns kotlin-spring with it.

Change: one line in
modules/openapi-generator/src/main/resources/kotlin-spring/libraries/spring-cloud/pom-sb4.mustache
— spring-cloud-starter-parent → spring-cloud-dependencies.

Samples: no committed sample exercises this template path — bin/configs/kotlin-spring-cloud.yaml does not set useSpringBoot4, and the only useSpringBoot4 kotlin-spring config (kotlin-spring-boot-4.yaml) uses library: spring-boot, not spring-cloud. Regenerating samples therefore produces no diff for this change.

PR checklist

• Read the contribution guidelines.
• Run the following to build the project and update samples:

  ./mvnw clean package || exit
  ./bin/generate-samples.sh ./bin/configs/*.yaml || exit
  ./bin/utils/export_docs_generators.sh || exit
  

  (No sample covers the kotlin-spring + spring-cloud + Spring Boot 4 path, so this produces no sample changes; template-only fix.) added kotlin-spring-cloud-4 sample
• If your PR is targeting a particular programming language, @mention the technical committee members, so they are more likely to review the pull request.

@karismann (2019/03) @Zomzog (2019/04) @andrewemery (2019/10) @4brunu (2019/11) @yutaka0m (2020/03) @stefankoppier (2022/06) @e5l (2024/10)

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Summary by cubic

Switch the Kotlin Spring spring-cloud Spring Boot 4 pom to the spring-cloud-dependencies BOM (2025.1.0) to fix dependency resolution and match the JavaSpring template. Adds a sample and config for the kotlin-spring + spring-cloud + useSpringBoot4=true path to reproduce and validate.

• Bug Fixes
  • In kotlin-spring/libraries/spring-cloud/pom-sb4.mustache, replace spring-cloud-starter-parent with spring-cloud-dependencies.
  • Add bin/configs/kotlin-spring-cloud-4.yaml and samples/server/petstore/kotlin-spring-cloud-4 (Gradle and Maven) to verify the BOM resolves.

^{Written for commit 3433c84. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 1 file

_{Re-trigger cubic}

[wing328]

thanks for the PR

i wonder if you can create a test config similar to https://github.com/OpenAPITools/openapi-generator/blob/master/bin/configs/kotlin-spring-cloud.yaml (and generate the samples twice, commit the new files) to catch the issue moving forward.

[Chrimle]

Awesome, thanks for the contribution! <3

For future reference; Here's the equivalent in JavaSpring, as described in the PR description.

[zaenk]

• rebased to master and added new sample config in 833953e
• rebuilt openapi jar with ./mvnw clean install -pl modules/openapi-generator-cli -am -DskipTests
• generated samples with ./bin/generate-samples.sh bin/configs/kotlin-spring-cloud-4.yaml
• commited, rebased original commit to this one, rebuilt sources, observed the fix in 954c73c
• squashed, rebased to master, rebuilt the jar and samples for kotlin-spring-cloud-4 again

[zaenk]

@wing328 @Chrimle thanks for the pointers, I've added the new sample, squashed into a single commit, and rebased to master, see #24326 (comment), pipeline is now green

[Chrimle]

Looks great! ❤️

Disclaimer: I am not proficient in Kotlin, but the actual change (to the .mustache-file) is correct, and I trust the auto-generated sample files 👍