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build reactive JVM applications for HTTP and TCP with event loops and non-blocking I/O

OSS scale score 324.7OSS health 100
About these scores

OSS scale score is an unbounded metric that log-compresses and weights Stars, Watchers, Forks, and Contributors. Discovery score is the current OSS scale score minus the score at discovery. Update pace is commits in the last 30 days, growth momentum is the OSS scale score difference within the recent observation window, and OSS health is a 0–100 rating based on available recency, Community Health, and release data.

Stars
14,689
Primary language
Java
License
EPL-2.0 OR Apache-2.0
Repository last updated
Oct 5, 2026
On this page

Overview

Eclipse Vert.x Core is a low-level toolkit for reactive applications on the JVM. It provides HTTP, TCP, file-system, and related primitives and underpins other Vert.x components.

Features and best fit

Based on official documentation; not hands-on tested · Content checked:

Key features

Expose core HTTP, TCP, and file-system primitives

The README describes Vert.x Core as low-level functionality for HTTP, TCP, file-system access, and other features used directly by applications and by other Vert.x components.

Sources: [2]

Support native network transports on supported platforms

The project includes test profiles for epoll, io_uring, kqueue, and Linux domain sockets, allowing platform-specific transport choices where appropriate.

Sources: [2]

Best fit

Fits highly concurrent APIs, gateways, and network services

It is useful when teams want to handle many connections with an event-loop model and keep HTTP and TCP services within the same reactive toolkit.

Sources: [2]

Before adoption

Keep blocking work off event loops and review the dual license

Blocking I/O and heavy CPU work need explicit isolation from event-loop threads. The repository is offered under EPL-2.0 or Apache-2.0.

Sources: [2][3]

Official sources

  1. [1]eclipse-vertx/vert.x — GitHub repository(2026-10-06)
  2. [2]Eclipse Vert.x Core — README(2026-10-06)
  3. [3]Eclipse Vert.x — License(2026-10-06)
Supplemental curator note

It fits highly concurrent HTTP, API, and network services that want an event-loop model instead of thread-per-request. Blocking work must be isolated deliberately.

Try it in 3 steps

  1. 1

    Get the source

    git clone --depth 1 https://github.com/eclipse-vertx/vert.x.git
  2. 2

    Enter the repository

    cd vert.x
  3. 3

    Check the official steps

    Continue with the commands in the README Installation, Quick Start, or Getting Started section.

    find . -maxdepth 1 -iname 'README*' -exec sed -n '1,220p' {} \; -quit
Check the official README

Growth

Growth trends · Last 30 days

14,689 Stars

Trend data is still being collected.

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Categories and tags

Categories

Tags

GitHub data

GitHub dataView detailed GitHub data
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GitHub Topics

  • concurrency
  • event-loop
  • high-performance
  • http2
  • java
  • jvm
  • netty
  • nio
  • non-blocking
  • reactive
  • vertx
Stars
14,689
Forks
2,108
Watchers
14,689
Open issues
222
Contributors
267
Owner type
Organization
Primary language
Java
Repository last updated
Oct 5, 2026
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