[Java][RestTemplate] Gradle Build include non-compatible Spring Dependency with jakarta disabled

[steven-blakowski]

Summary

The generator for RestTemplate include the Spring dependencies with version 6.x.x for gradle in case of JakartaEE=false. However, this version require at least JDK17+, whereas the latest compatible dependency for Spring is version 5.x.x and also compatible with JDK 8 or 11.

openapi-generator version

• openapi-generator-cli 7.13.0
• latest master version

Steps to reproduce

This error can be reproduced quite easily on master branch with the following commands:

cd samples/client/petstore/java/resttemplate
./gradlew clean build

Output:

* What went wrong:
Execution failed for task ':compileJava'.
> Could not resolve all files for configuration ':compileClasspath'.
   > Could not resolve org.springframework:spring-web:6.2.8.
     Required by:
         project :
      > No matching variant of org.springframework:spring-web:6.2.8 was found. The consumer was configured to find a library for use during compile-time, compatible with Java 8, preferably in the form of class files, preferably optimized for standard JVMs, and its dependencies declared externally but:
          - Variant 'apiElements' declares a library for use during compile-time, packaged as a jar, preferably optimized for standard JVMs, and its dependencies declared externally:
              - Incompatible because this component declares a component, compatible with Java 17 and the consumer needed a component, compatible with Java 8
          - Variant 'runtimeElements' declares a library for use during runtime, packaged as a jar, preferably optimized for standard JVMs, and its dependencies declared externally:
              - Incompatible because this component declares a component, compatible with Java 17 and the consumer needed a component, compatible with Java 8

Related issues/PRs

A similar issue with the dependencies was reported by #14925

Implementation hint

While trying to integrate gradle additionally into the Samples Java Client JDK11 Job, several further permissions and dependency issues occurred.

PR checklist

• Read the contribution guidelines.
• Pull Request title clearly describes the work in the pull request and Pull Request description provides details about how to validate the work. Missing information here may result in delayed response from the community.
• 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.
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• File the PR against the correct branch: master (upcoming 7.x.0 minor release - breaking changes with fallbacks), 8.0.x (breaking changes without fallbacks)
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[wing328]

https://github.com/OpenAPITools/openapi-generator/actions/runs/15716990742/job/44319517775?pr=21426

thanks for the pr

let me know if you need help updating the samples

[steven-blakowski]

Thanks for the hint. The samples are updated.

[wing328]

thanks for the fix, which has been merged into master and will be included in the upcoming v7.14.0 release (due today)