Blog

Engineering posts about async.java — performance, design, comparisons with other JVM orchestration libraries, and how the library fits with Project Loom.

May 17, 2026
async.java vs Akka Streams: a load-curve story
Where the 3-4× tail-latency gap comes from, why it isn't magic, and what it means for picking a JVM async coordination library in 2026.

async.java

async.java is a Java 11+ port of the Node.js async control-flow library. Parallel, Series, Waterfall, Race, Map, Reduce, Queue, Lock — small, predictable, virtual-thread friendly.

MIT-licensed. Released artifacts on JitPack as com.github.async-java:async.java:v0.2.6.

Links

GitHub repo
Releases
Changelog
Javadoc (latest)
Javadoc (0.2.6)
Javadoc (0.2.5)
Javadoc (0.2.4)
Javadoc (0.1.0, legacy)

Install (JitPack)

<repository>
  <id>jitpack.io</id>
  <url>https://jitpack.io</url>
</repository>

<dependency>
  <groupId>com.github.async-java</groupId>
  <artifactId>async.java</artifactId>
  <version>v0.2.6</version>
</dependency>