fix: restore ProGuard configuration caching

[apcha-oai]

Why

The existing test workflow enables Gradle’s configuration cache, but ProGuard prevents it from being saved:

Task ':openai-java-proguard-test:proguardJar':
cannot serialize object of type 'ShadowJar'

Configuration cache entry discarded with 1 problem.

Example: CI test job.

What changes

Makes the ProGuard and R8 compatibility tasks compatible with Gradle’s configuration cache by passing a resolved JAR path instead of a Gradle task object.

This does not introduce cross-run caching, new secrets, or changes to fork permissions.

Validation

./gradlew :openai-java-proguard-test:test --configuration-cache --configuration-cache-problems=fail
./gradlew :openai-java-proguard-test:lintKotlin

Confirmed that the first test run stores the configuration cache and a subsequent run reuses it.

[openai-sdks]

OkTest Summary

✅ 237/237 SDK tests passed in 16.667s for Java SDK PR #842.

Test results — 42 files

Test	Result	Time
tests/chat-completions-complex-body.test.ts	✅ Passed	150ms
tests/chat-completions-create.test.ts	✅ Passed	481ms
tests/chat-completions-stream.test.ts	✅ Passed	318ms
tests/files-content-binary.test.ts	✅ Passed	278ms
tests/files-create-multipart.test.ts	✅ Passed	262ms
tests/files-list-pagination.test.ts	✅ Passed	309ms
tests/initialize-config.test.ts	✅ Passed	206ms
tests/instance-isolation.test.ts	✅ Passed	309ms
tests/models-list.test.ts	✅ Passed	237ms
tests/responses-background-lifecycle.test.ts	✅ Passed	379ms
tests/responses-body-method-errors.test.ts	✅ Passed	527ms
tests/responses-cancel-timeout.test.ts	✅ Passed	228ms
tests/responses-cancel.test.ts	✅ Passed	369ms
tests/responses-compact-retries.test.ts	✅ Passed	335ms
tests/responses-compact.test.ts	✅ Passed	241ms
tests/responses-create-advanced-stream.test.ts	✅ Passed	672ms
tests/responses-create-advanced.test.ts	✅ Passed	1.298s
tests/responses-create-disconnect.test.ts	✅ Passed	1.146s
tests/responses-create-errors.test.ts	✅ Passed	364ms
tests/responses-create-malformed-api-responses.test.ts	✅ Passed	342ms
tests/responses-create-retries.test.ts	✅ Passed	314ms
tests/responses-create-stream-failures.test.ts	✅ Passed	282ms
tests/responses-create-stream-timeout.test.ts	✅ Passed	261ms
tests/responses-create-stream-wire.test.ts	✅ Passed	6.21s
tests/responses-create-stream.test.ts	✅ Passed	406ms
tests/responses-create-terminal-states.test.ts	✅ Passed	312ms
tests/responses-create-timeout.test.ts	✅ Passed	208ms
tests/responses-create.test.ts	✅ Passed	236ms
tests/responses-delete.test.ts	✅ Passed	350ms
tests/responses-input-items-errors.test.ts	✅ Passed	277ms
tests/responses-input-items-list.test.ts	✅ Passed	318ms
tests/responses-input-items-options.test.ts	✅ Passed	503ms
tests/responses-input-tokens-count-timeout.test.ts	✅ Passed	203ms
tests/responses-input-tokens-count.test.ts	✅ Passed	517ms
tests/responses-malformed-inputs.test.ts	✅ Passed	5.077s
tests/responses-not-found-errors.test.ts	✅ Passed	391ms
tests/responses-parse.test.ts	✅ Passed	730ms
tests/responses-retrieve-retries.test.ts	✅ Passed	808ms
tests/responses-retrieve.test.ts	✅ Passed	304ms
tests/responses-stored-method-errors.test.ts	✅ Passed	960ms
tests/retry-behavior.test.ts	✅ Passed	3.648s
tests/sdk-error-shape.test.ts	✅ Passed	478ms

View OkTest run #31672797599

_{SDK merge (fdbd3aaf613e) · head (833b94b93799) · base (2b763fe6ffdc) · OkTest (a845fa206fa4)}

[Copilot]

Pull request overview

This PR restores Gradle configuration-cache compatibility for the openai-java-proguard-test module by removing direct task-object references (notably ShadowJar) from ProGuard/R8 task configuration, which previously prevented the configuration cache from being saved.

Changes:

• Introduces a shadowJarFile provider and uses its resolved output path when configuring ProGuard/R8 inputs.
• Removes explicit notCompatibleWithConfigurationCache(...) markers from ProGuard/R8-related tasks, enabling configuration-cache persistence.

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[HAYDEN-OAI]

Reviewed Gradle configuration-cache behavior, ProGuard/R8 task inputs and dependencies, cache invalidation, and exact-head CI execution. Both shrinker compatibility checks remain intact; LGTM.

[jbeckwith-oai]

Reviewed the exact-head Gradle configuration-cache fix. The change removes the non-serializable ShadowJar task reference while preserving explicit task dependencies and both ProGuard/R8 compatibility checks. Verified locally that the ProGuard/R8 test task succeeds with configuration-cache problems treated as failures, a subsequent no-change run reuses the cache, and Kotlin lint passes. CI tests, lint, build, API compatibility, and runtime matrices are green. LGTM.