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Jakub Zych c8e87daa3e docs(quick-001): complete JDK requirement update plan

Tasks completed: 1/1
- Update JDK requirement in research/STACK.md

SUMMARY: .planning/quick/001-update-jdk-requirement-to-21-for-loom-vi/001-SUMMARY.md

2026-02-05 13:08:15 +01:00

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Quick Task 001: Update JDK Requirement Summary

JDK requirement updated to 21+ with Loom virtual threads rationale for JDBC blocking operations in Quill

Performance

Duration: <1 min
Started: 2026-02-05T12:07:20Z
Completed: 2026-02-05T12:07:56Z
Tasks: 1
Files modified: 1

Accomplishments

Updated JDK version requirement from 17+ to 21+ in Language & Runtime table
Added rationale explaining Loom virtual threads benefit for JDBC blocking operations
Clarified that ZIO fibers and JVM virtual threads are complementary, not competing

Task Commits

Each task was committed atomically:

Task 1: Update JDK requirement in research/STACK.md - 64dcded (docs)

Files Created/Modified

.planning/research/STACK.md - Updated JDK requirement and added Loom rationale note

Decisions Made

JDK 21+ is the new baseline (was 17+) - both are LTS releases
Rationale focuses on JDBC blocking operations which benefit from Loom virtual threads
Explicitly clarifies that ZIO's fiber system is complementary to JVM virtual threads

Deviations from Plan

None - plan executed exactly as written.

Issues Encountered

None

User Setup Required

None - documentation-only change.

Next Phase Readiness

Stack documentation now accurately reflects JDK 21+ requirement
Ready for Phase 2 planning

Quick Task: 001 Completed: 2026-02-05

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