Minor improvements to Spring codegen

[wing328]

FYI @cachescrubber (2022/02) @welshm (2022/02) @MelleD (2022/02) @atextor (2022/02) @manedev79 (2022/02) @javisst (2022/02) @borsch (2022/02) @banlevente (2022/02) @Zomzog (2022/09) @martin-mfg (2023/08) @KannaKim (2026/07)

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
  

  (For Windows users, please run the script in WSL)
  Commit all changed files.
  This is important, as CI jobs will verify all generator outputs of your HEAD commit as it would merge with master.
  These must match the expectations made by your contribution.
  You may regenerate an individual generator by passing the relevant config(s) as an argument to the script, for example ./bin/generate-samples.sh bin/configs/java*.
  IMPORTANT: Do NOT purge/delete any folders/files (e.g. tests) when regenerating the samples as manually written tests may be removed.
• If your PR is targeting a particular programming language, @mention the technical committee members, so they are more likely to review the pull request.

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Summary by cubic

Polished org.openapitools.codegen.languages.SpringCodegen with small cleanups and a logging fix. Improves readability and correctness without changing generated code behavior.

• Bug Fixes

  • Fixed trace log format string in provide-args processing (removed extra placeholder).

• Refactors

  • Made RequestMappingMode.description final.
  • Simplified tag handling (isEmpty(), Collections.singletonList); removed an unused variable.
  • Streamlined container return-type parsing and minor checks (size() vs keySet().size(), direct boolean fields).

^{Written for commit f3f5d0e. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 1 file

_{Re-trigger cubic}