Migrate from Java 11 to Java 17

[devin-ai-integration]

Migrate from Java 11 to Java 17

Summary

Upgrades the Spring Boot application from Java 11 to Java 17 as requested. The changes include:

• Updated build.gradle to use Java 17 for source and target compatibility
• Updated GitHub Actions CI pipeline to use JDK 17 instead of JDK 11
• Fixed deprecated actions/cache@v2 → actions/cache@v4 (was causing CI failures)

All local verification passed successfully:

• ✅ Code compiles with Java 17
• ✅ All 68 tests pass
• ✅ Application starts successfully on localhost:8080
• ✅ Core functionality works (tested /tags endpoint)

Review & Testing Checklist for Human

• End-to-end functionality verification: Run the application locally and test key user flows beyond just the /tags endpoint to ensure no runtime compatibility issues with Java 17
• CI passes: Verify that GitHub Actions build now succeeds with JDK 17 and the updated actions/cache@v4

Notes

• Spring Boot 2.6.3 officially supports Java 17, and all major dependencies (MyBatis 2.2.2, Netflix DGS 4.9.21, JWT libraries) appear compatible
• The actions/cache update from v2→v4 was necessary because GitHub deprecated v2 as of December 5, 2024
• No application code changes were required - only configuration updates

Requested by: @SachetCognition
Devin session: https://app.devin.ai/sessions/699a4ed8f3bd4281bbb56846e2e7e126

[devin-ai-integration]

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