[Task] Design the main repo JDK upgrade path for admin/bootstrap/runtime

[Aias00]

Description

Background

The main ShenYu repository should be able to evolve admin, bootstrap, gateway runtime, and plugins independently from Java client JDK 8 compatibility constraints.

We need a JDK upgrade plan for the main repo, especially if future runtime work depends on JDK 21 features such as virtual threads.

Tasks

• Inventory current JDK constraints in the main repository.
• Identify modules that can move to JDK 21+.
• Identify modules that must remain lower-JDK compatible, if any.
• Review Maven compiler/toolchain configuration.
• Review Docker image JDK versions.
• Review CI matrix and release workflow.
• Identify third-party dependencies affected by JDK upgrade.
• Identify examples and integration tests affected by JDK upgrade.
• Propose a staged migration plan.

Expected Output

A JDK upgrade design document covering:

• Current JDK baseline
• Target JDK baseline
• Affected modules
• Build/CI changes
• Docker/runtime changes
• Dependency risks
• Rollback strategy
• Migration phases

Acceptance Criteria

• The plan makes clear that client JDK 8 compatibility is handled in shenyu-client-java.
• The plan identifies risks before implementation starts.
• The plan includes at least one incremental migration phase.

Task List

No response

[github-actions]

👋 Hello @yuluo-yx

A new issue has been opened by @Aias00:

• Title: [Task] Design the main repo JDK upgrade path for admin/bootstrap/runtime
• Link: [Task] Design the main repo JDK upgrade path for admin/bootstrap/runtime #6368

Please review when you have time. Thank you! 🙏