jetty/jetty.project

Provide a thread pool that limits virtual threads creation

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#14,362 opened on Jan 19, 2026

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EnhancementHelp Wanted

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Description

Jetty version(s) 12.1.x

Enhancement Description Following discussion in #14330, would be nice to document how to create a thread pool that actually limits the number of virtual threads.

Would a QueuedThreadPool with a virtual ThreadFactory be enough?

Contributor guide

Research direction
Investigate whether QueuedThreadPool with a virtual ThreadFactory can limit virtual thread creation, verify against Jetty's thread pool implementation, and propose documentation or example code.
Tech stack
java
Domain
backend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
JavaThreading concepts
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60