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docs(quick-001): update JDK requirement from 17+ to 21+ for Loom virtual threads

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- Update JDK version requirement in Language & Runtime table
- Add rationale explaining Loom virtual threads benefit for JDBC blocking ops
- Clarify ZIO fibers and JVM virtual threads are complementary
This commit is contained in:
Jakub Zych
2026-02-05 13:07:52 +01:00
parent 7a8cad2060
commit 64dcdedfa2
1 changed files with 2 additions and 1 deletions
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.planning/research/STACK.md
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@@ -19,7 +19,7 @@ The ZIO ecosystem in 2025/2026 is mature and production-ready. ZIO HTTP 3.x is s
| Technology | Version | Purpose | Rationale | | Technology | Version | Purpose | Rationale |
|------------|---------|---------|-----------| |------------|---------|---------|-----------|
| Scala | 3.3.7 LTS | Core language | LTS provides stability for a multi-year project; 3.8.x requires JDK 17+ which may limit deployment options | | Scala | 3.3.7 LTS | Core language | LTS provides stability for a multi-year project; 3.8.x requires JDK 17+ which may limit deployment options |
| JDK | 17+ | Runtime | Required for Scala 3.3.x LTS, widely available, long-term support | | JDK | 21+ | Runtime | LTS (Sept 2023), Loom virtual threads benefit JDBC blocking operations in Quill |
| ZIO | 2.1.24 | Effect system | Latest stable with stream performance improvements, binary compatibility guaranteed in 2.x line | | ZIO | 2.1.24 | Effect system | Latest stable with stream performance improvements, binary compatibility guaranteed in 2.x line |
**Confidence:** HIGH - Verified via [Scala releases](https://www.scala-lang.org/download/all.html), [ZIO releases](https://github.com/zio/zio/releases) **Confidence:** HIGH - Verified via [Scala releases](https://www.scala-lang.org/download/all.html), [ZIO releases](https://github.com/zio/zio/releases)
@@ -27,6 +27,7 @@ The ZIO ecosystem in 2025/2026 is mature and production-ready. ZIO HTTP 3.x is s
**Notes:** **Notes:**
- Scala 3.3.7 LTS is recommended over 3.8.x bleeding edge - CMF needs stability over newest features - Scala 3.3.7 LTS is recommended over 3.8.x bleeding edge - CMF needs stability over newest features
- ZIO 2.1.x line has explicit binary compatibility guarantees, critical for plugin ecosystem - ZIO 2.1.x line has explicit binary compatibility guarantees, critical for plugin ecosystem
- JDK 21+ for Loom virtual threads: While ZIO provides its own fiber system, Quill uses JDBC which does blocking I/O. Virtual threads make these blocking calls "virtually" non-blocking at the JVM level. ZIO can use virtual thread executors for blocking operations, complementing ZIO fibers rather than replacing them.
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