upgrade to JAVA 21

[peepeepopapapeepeepo]

What are the relevant tickets?

N/A

Description (What does it do?)

Fixes Keycloak SCIM extension build system and resolves SCIM provisioning failures by upgrading build dependencies and OpenRewrite configuration.

Key Changes:

• Upgraded Gradle: 4.4.1 → 8.5 for modern dependency compatibility
• Updated Java target: 8 → 21 to match Keycloak container runtime
• Fixed shadow plugin: 4.0.4 → 8.1.1 for Gradle 8+ compatibility
• Modernized OpenRewrite: 6.24.0 → 7.18.0 with comprehensive recipes

Problem Solved:
The original build used outdated OpenRewrite versions with aggressive code transformations that broke SCIM provisioning functionality. Users were successfully created in IAM Identity Center (HTTP 201) but the SCIM SDK threw InvalidResponseFromScimEndpointException due to problematic code transformations.

Result:

• ✅ SCIM provisioning now works correctly
• ✅ Modern build system with Java 21
• ✅ Comprehensive code quality improvements
• ✅ Consistent code formatting

How can this be tested?

1. Build the extension:

   gradle shadowJar

2. Deploy to Keycloak:

   • Copy build/libs/keycloak-scim-1.0-SNAPSHOT-all.jar to Keycloak providers directory
   • Restart Keycloak

3. Test SCIM provisioning:

   • Configure SCIM endpoint in Keycloak admin console
   • Create a test user in Keycloak
   • Verify user is successfully provisioned to target system (e.g., AWS IAM Identity Center)
   • Confirm no InvalidResponseFromScimEndpointException errors in logs

4. Verify extension loading:

   • Check Keycloak logs for successful SCIM extension loading
   • Confirm no Liquibase checksum errors

Additional Context

This fix addresses a critical issue where the SCIM extension would load successfully but fail during actual user provisioning. The root cause was identified as problematic OpenRewrite code transformations in the original build configuration.

The new build configuration uses modern, stable versions of all dependencies while maintaining full SCIM functionality. The comprehensive OpenRewrite setup now provides code quality improvements without breaking the core functionality.

Build Requirements:

• Java 21+
• Gradle 8.5+

Runtime Requirements:

• Keycloak 25.0+
• Java 21+ (matches Keycloak container)

[gemini-code-assist]

Summary of Changes

Hello @peepeepopapapeepeepo, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a critical issue preventing successful SCIM provisioning in the Keycloak SCIM extension. By upgrading core build dependencies like Gradle, Java target version, and OpenRewrite, the PR ensures the extension builds correctly, functions as expected, and aligns with modern development standards. The changes specifically resolve problematic code transformations that previously broke SCIM functionality, leading to a stable and compliant build system.

Highlights

• Gradle Upgrade: The build system has been upgraded from Gradle 4.4.1 to 8.5, ensuring compatibility with modern dependencies and build practices.
• Java Target Version Update: The Java target version has been updated from 8 to 21, aligning with the Keycloak container runtime requirements.
• Shadow Plugin Fix: The shadow plugin version has been upgraded from 4.0.4 to 8.1.1 to ensure proper functionality with Gradle 8+.
• OpenRewrite Modernization: OpenRewrite has been modernized from version 6.24.0 to 7.18.0, including comprehensive recipes to improve code quality without breaking functionality.
• SCIM Provisioning Fix: This update resolves critical SCIM provisioning failures caused by outdated OpenRewrite configurations that led to InvalidResponseFromScimEndpointException.

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[gemini-code-assist]

Code Review

This pull request upgrades the project to Java 21 by updating dependencies and configuration in build.gradle. The changes correctly set the Java version and update the OpenRewrite plugin. I've added one suggestion to make the Java version configuration more explicit and robust by using a java block and setting both source and target compatibility, which is a recommended practice in modern Gradle builds.