[BUG] InstanceInfoServiceImpl.findById always returns null (stub implementation)

[Aias00]

• severity: High
• files: shenyu-admin/src/main/java/org/apache/shenyu/admin/service/impl/InstanceInfoServiceImpl.java:91-94
• description: The method body is literally return null; — it never reads from instanceInfoMapper. InstanceController.detailInstanceInfo calls this and returns the null as the response data.
• impact: The instance detail endpoint (GET /instance/{id}, gated by system:instance:edit) always returns null data; the feature is non-functional.
• suggested_fix: Implement findById to query instanceInfoMapper.selectById(id) and map via buildInstanceInfoVO.
• confidence: High
• related_existing: none.

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Identified during the 2026-08-02 deep re-scan; full list in docs/scan2-2026-08-02/00-consolidated-critical-high.md.

[github-actions]

👋 Hello @Aias00

A new issue has been opened by @Aias00:

• Title: [BUG] InstanceInfoServiceImpl.findById always returns null (stub implementation)
• Link: [BUG] InstanceInfoServiceImpl.findById always returns null (stub implementation) #6618

Please review when you have time. Thank you! 🙏