Fix: Replace deprecated OpenJDK Docker images with Eclipse Temurin

[ChiragAgg5k]

Problem

The official OpenJDK Docker images have been deprecated and removed from Docker Hub by Oracle, causing test failures with the error:

docker: Error response from daemon: manifest for openjdk:*-jdk-slim not found: manifest unknown

This issue affected all Kotlin test suites that relied on OpenJDK 8, 11, and 17 images.

Solution

This PR replaces all deprecated OpenJDK images with Eclipse Temurin images:

Old Image	New Image
openjdk:8-jdk-slim	eclipse-temurin:8-jdk-jammy
openjdk:11-jdk-slim	eclipse-temurin:11-jdk-jammy
openjdk:17-jdk-slim	eclipse-temurin:17-jdk-jammy

Background & Documentation

Eclipse Temurin is now the official OpenJDK distribution maintained by the Eclipse Foundation and the Adoptium Working Group. It provides:

• Fully compatible, drop-in replacement for deprecated OpenJDK images
• Regular security updates and long-term support
• Built on Ubuntu 22.04 LTS (-jammy variant)
• Community-driven, vendor-neutral OpenJDK builds

Why OpenJDK Images Were Deprecated

Oracle announced the deprecation of the official openjdk Docker images in favor of community-driven distributions. The Eclipse Adoptium project (formerly AdoptOpenJDK) is the recommended successor.

References

• Eclipse Temurin Official Docker Hub
• Adoptium Official Website
• OpenJDK Docker Images Deprecation Notice

Files Changed

• tests/KotlinJava8Test.php - Updated Java 8 test environment
• tests/KotlinJava11Test.php - Updated Java 11 test environment
• tests/KotlinJava17Test.php - Updated Java 17 test environment

Testing

The tests should now run successfully without the Docker manifest error. All Kotlin SDK tests will use the new Eclipse Temurin images.

Impact

✅ No Breaking Changes - Eclipse Temurin is a drop-in replacement for OpenJDK
✅ Better Maintenance - Active community support and regular updates
✅ Fixes CI/CD - Resolves Docker image pull failures

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📥 Commits

Reviewing files that changed from the base of the PR and between 42df221 and 66303a3.

📒 Files selected for processing (3)

• tests/KotlinJava11Test.php (1 hunks)
• tests/KotlinJava17Test.php (1 hunks)
• tests/KotlinJava8Test.php (1 hunks)

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix-deprecated-openjdk-images

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