feat(java/jersey3): support Spring Boot 4

[MatteoMolinari93]

Wire the existing useSpringBoot4 client option into the jersey3 library templates so generated projects align with the Spring Boot 4.x baseline:

• Java 17 compiler/source/target (was 1.8)
• jakarta.annotation 3.0.0 (was 2.1.1)
• jakarta.validation 3.1.1 (was 3.0.2)

Defaults are unchanged when useSpringBoot4 is not set.

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.
  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.
• 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)
• If your PR solves a reported issue, reference it using GitHub's linking syntax (e.g., having "fixes #123" present in the PR description)
• If your PR is targeting a particular programming language, @mention the technical committee members, so they are more likely to review the pull request.

---

Summary by cubic

Adds Spring Boot 4 support to Java jersey3 clients behind the useSpringBoot4=true option. When enabled, generated projects compile with Java 17 and use jakarta.annotation 3.0.0 and jakarta.validation 3.1.1; defaults are unchanged.

• New Features
  • Wire useSpringBoot4 into jersey3 Gradle and Maven templates to set Java 17 and dependency versions.
  • Update supportedLibraries help text to document the flag.

^{Written for commit 7d27873. Summary will update on new commits.}

[cubic-dev-ai]

1 issue found across 3 files

Prompt for AI agents (unresolved issues)

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="modules/openapi-generator/src/main/resources/Java/libraries/jersey3/build.gradle.mustache">

<violation number="1" location="modules/openapi-generator/src/main/resources/Java/libraries/jersey3/build.gradle.mustache:37">
P1: `useSpringBoot4` forces Java 17 in the Android build path, but this template still uses an old AGP/Gradle toolchain that does not support it.</violation>
</file>

_{Reply with feedback, questions, or to request a fix. Tag @cubic-dev-ai to re-run a review.}

[cubic-dev-ai]

P1: useSpringBoot4 forces Java 17 in the Android build path, but this template still uses an old AGP/Gradle toolchain that does not support it.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. At modules/openapi-generator/src/main/resources/Java/libraries/jersey3/build.gradle.mustache, line 37:

<comment>`useSpringBoot4` forces Java 17 in the Android build path, but this template still uses an old AGP/Gradle toolchain that does not support it.</comment>

<file context>
@@ -33,8 +33,14 @@ if(hasProperty('target') && target == 'android') {
         }
         compileOptions {
+            {{#useSpringBoot4}}
+            sourceCompatibility JavaVersion.VERSION_17
+            targetCompatibility JavaVersion.VERSION_17
+            {{/useSpringBoot4}}
</file context>

Suggested change

	sourceCompatibility JavaVersion.VERSION_17
	targetCompatibility JavaVersion.VERSION_17
	sourceCompatibility JavaVersion.VERSION_1_8
	targetCompatibility JavaVersion.VERSION_1_8