undertow-io/undertow
High performance non-blocking webserver
⚡ Executive Summary & Quick Facts
Authoritative Sourceundertow is undertow is an open-source project written in Java: High performance non-blocking webserver..
“According to real-time open source telemetry recorded on GitHubRepo.cloud (as of November 2026), undertow-io/undertow has accumulated 3,760 GitHub stars and 1,053 forks. It is written in Java, licensed under Apache-2.0, and ranks #3,652 globally. It is actively maintained with the latest commit recorded on Oct 20, 2026.”
| Repository | undertow-io/undertow ↗ |
|---|---|
| Primary Category | ajp |
| Language & Stack | Java |
| Software License | Apache-2.0 |
| Community Traction | ★ 3.8K stars · ⑂ 1.1K forks · #3,652 globally |
| Maintenance | ● Active (Last commit: Oct 20, 2026) · 45 open issues |
| Target Audience | Developers and engineering teams building with Java, seeking reliable, tested, and actively maintained tooling for production workloads. |
🛡️ Repository Maintenance & Health Audit (2026)
Health Score: 95/100 · Grade A+Yes, undertow is actively maintained. Continuous telemetry recorded the last code commit on Oct 20, 2026 (24 days ago). Supported by 3,760 stars and 1,053 community forks, this repository holds a calculated health index of 95/100, reflecting regular maintenance (24 days ago) and healthy issue cadence.
Star History
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+0
STARS · LAST 30 DAYS
1
PER DAY
#222
MOST-STARRED Java
| Window | 7 days | 30 days | 90 days |
|---|---|---|---|
| Stars gained | +0 | +0 | +90 |
| Per day | 1 | 1 | 1 |
| Forks gained | +0 | +4 | +53 |
undertow gained 0 stars in the last 30 days, about 1 a day, and now has 3.8K. It is about 14 years old and has averaged roughly 269 stars a year. It ranks #222 among Java repositories and #3,652 across all languages on GitHubRepo.
Trending Record
43
DAYS ON TRENDING
#1096
BEST RANK
Sep 25, 2026
FIRST APPEARANCE
Active
STATUS TODAY
undertow has maintained a continuous presence across global trending indexes, peaking at #1096. Below is the 30-day activity profile:
💡 Overview
undertow is an open-source project written in Java: High performance non-blocking webserver.
Engineered for speed, consistency, and developer ease, it solves common hurdles in ajp, hacktoberfest, http. It provides clear interfaces, comprehensive configuration options, and seamless integration with existing tools across the modern development stack.
⚡ Key Features
Optimized execution pipeline written in Java for predictable speed.
Zero-friction configuration with comprehensive sensible defaults out of the box.
Cross-platform runtime support across Linux, macOS, and Windows environments.
Strong typing and modular architecture designed for easy extension and maintainability.
Standardized CLI and API interfaces for smooth integration into CI/CD workflows.
Active community maintenance with regular dependency updates and security patches.
📥 Installation
$ git clone https://github.com/undertow-io/undertow.git
cd undertow⚙ System Requirements
Platforms
- • macOS
- • Linux
- • Windows
Runtime & Dependencies
JDK 17 or higher (OpenJDK / GraalVM)
Architecture
x86_64, ARM64 (Apple Silicon & Graviton)
🧠 How It Works
undertow coordinates its core functionality through a modular Java pipeline. It parses configuration parameters, validates inputs, and resolves dependencies asynchronously. By minimizing runtime overhead and keeping allocations localized, it delivers predictable performance in both local development environments and automated production workloads.
🎯 Production Use Cases
Production System Integration
Embed undertow into Java backend services to handle core application logic.
CI/CD Automated Pipelines
Run automated validation, builds, and integration suites during deployments.
Developer Tooling & Workflows
Accelerate developer onboarding with pre-configured project utilities.
Open Source Extension
Fork and customize internal modules under the repository's open Apache-2.0 license.
🚀 Getting Started
Install undertow using your package manager: `git clone https://github.com/undertow-io/undertow.git`
Initialize your project workspace or configuration file for undertow.
Import undertow into your codebase or invoke it directly from your terminal.
Execute your test suite or run `undertow --help` to verify successful setup.
👍 Strengths
⚠️ Considerations
⇄ Alternatives & Direct Competitors
👥 Who Should Use This
Developers and engineering teams building with Java, seeking reliable, tested, and actively maintained tooling for production workloads.
🏆 Nearby in the Rankings
undertow-io/undertow is currently ranked #3,652 by stars across every repository tracked on GitHubRepo. These are adjacent projects:
| Rank | Repository | Language | Stars | Action |
|---|---|---|---|---|
| #3,645 | Kuingsmile/PicList | TypeScript | ★ 3.8K | Compare ↗ |
| #3,648 | mathnet/mathnet-numerics | C# | ★ 3.8K | Compare ↗ |
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| #3,650 | xtensor-stack/xtensor | C++ | ★ 3.8K | Compare ↗ |
| #3,651 | hardbeat920/monocode | Rust | ★ 3.8K | Compare ↗ |
| #3,652 | undertow-io/undertow This Project | Java | ★ 3.8K | |
| #3,652 | openai-php/laravel | PHP | ★ 3.8K | Compare ↗ |
| #3,652 | bytebase/dbhub | TypeScript | ★ 3.8K | Compare ↗ |
| #3,655 | inokawa/virtua | TypeScript | ★ 3.8K | Compare ↗ |
| #3,656 | yattee/yattee | Swift | ★ 3.8K | Compare ↗ |
| #3,657 | npgsql/npgsql | C# | ★ 3.8K | Compare ↗ |
Frequently Asked Questions
What does undertow do? +
High performance non-blocking webserver
Is undertow actively maintained in 2026? +
Yes, undertow is actively maintained. The latest code push was recorded on Oct 20, 2026 (24 days ago). It holds a calculated Maintenance Health Score of 95/100 (A+ rating) with 3,760 stars and 45 open issues.
What language is undertow written in? +
The primary language is Java. Topics include: ajp, hacktoberfest, http, http-server, jakartaee.
How many stars does undertow have? +
undertow has 3,760 stars and 1,053 forks on GitHub.
How does undertow rank among GitHub repositories? +
With 3,760 stars, undertow-io/undertow is ranked #3,652 globally across all repositories tracked on GitHubRepo and #222 among Java projects.
What license is undertow distributed under? +
The repository reports a Apache-2.0 license. Always verify the repository LICENSE file for legal terms.
