jetty/jetty.project

Provide a thread pool that limits virtual threads creation

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#14362 opened on Jan 19, 2026

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EnhancementHelp Wanted

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

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.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
needs investigation
Prerequisites
JavaJetty basics
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30
Research direction
Investigate how to create a thread pool that limits virtual threads in Jetty. Refer to the discussion in issue #14330. Explore the QueuedThreadPool class and whether using a virtual ThreadFactory effectively limits the number of virtual threads. Look for documentation or examples in the Jetty codebase on thread pool configuration.