Top 7 Java HTTP2 Projects

Vert.x

15 13,453 9.1 Java

Vert.x is a tool-kit for building reactive applications on the JVM

Project mention: Go doesn’t do any magical stuff and I love that | reddit.com/r/golang | 2023-03-12

There are many lean, popular, non-magical libraries in Java land. (https://quarkus.io/, https://vertx.io/, etc). Spring is a monster 😱. Its like comparing Kubernetes (written in Go) with some lean framework in another lang.
AndroidNetworking

0 5,545 0.0 Java

🚀 A Complete Fast Android Networking Library that also supports HTTP/2 🚀
Sonar

www.sonarsource.com
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Write Clean Java Code. Always.. Sonar helps you commit clean code every time. With over 600 unique rules to find Java bugs, code smells & vulnerabilities, Sonar finds the issues while you focus on the work.
Armeria

2 4,173 9.4 Java

Your go-to microservice framework for any situation, from the creator of Netty et al. You can build any type of microservice leveraging your favorite technologies, including gRPC, Thrift, Kotlin, Retrofit, Reactive Streams, Spring Boot and Dropwizard.

Project mention: Evaluating Spring Boot, Quarkus, or Micronaut and why for Stargate v2 | reddit.com/r/java | 2022-12-26

OP doesn't seem to be aware of Armeria https://github.com/line/armeria
Jetty

6 3,524 9.7 Java

Eclipse Jetty® - Web Container & Clients - supports HTTP/2, HTTP/1.1, HTTP/1.0, websocket, servlets, and more

Project mention: Security of Eclipse Jetty dependencies | reddit.com/r/qztray | 2022-11-02

So, 9.4.48 fixes the first two CVEs, but the last one doesn't mention 9.4 at all, so I'm not sure if that's left out due to EOL status for 9.4.
ServiceTalk

2 820 9.1 Java

A networking framework that evolves with your application

Project mention: ServiceTalk – A networking framework that evolves with your application | news.ycombinator.com | 2023-03-24
PacketProxy

0 414 6.3 Java

A local proxy written in Java
Firefly

0 288 6.8 Java

Firefly is an asynchronous web framework for rapid development of high-performance web application. (by hypercube1024)
InfluxDB

www.influxdata.com
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Access the most powerful time series database as a service. Ingest, store, & analyze all types of time series data in a fully-managed, purpose-built database. Keep data forever with low-cost storage and superior data compression.

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020). The latest post mention was on 2023-03-24.