Top 4 Java Modular Projects

Jooby

13 1,658 9.7 Java

The modular web framework for Java and Kotlin

Project mention: Javalin – a simple web framework for Java and Kotlin | news.ycombinator.com | 2024-02-11

One of the good things about it is that using asynchrony is optional. If you don't have to call out anywhere to build the response, processing can all stay in the handler's calling thread. If you do, you can return a future and have the library handle the async for you.
One downside is that it is based on Jetty which isn't considered the most performant backend. A lib with a similar API but based on Netty is Jooby [1] which scores well in the Techempower benchmarks.
[1] - https://jooby.io/

samples

13 564 3.6 Java

JavaFX samples to run with different options and build tools (by openjfx)

Project mention: NoClassDefFoundError while trying to run javafx programs made with maven. | /r/javahelp | 2023-12-08

If you're relatively new to this, I would recommend checking out the JavaFX documentation at https://openjfx.io/openjfx-docs/#maven and starting from the samples: https://github.com/openjfx/samples/tree/master/HelloFX/Maven

InfluxDB

www.influxdata.com sponsored

Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Para

0 514 7.5 Java

Multitenant backend server for building web and mobile apps rapidly. The backend for busy developers. (self-hosted or hosted) (by Erudika)
grakkit

4 207 0.0 Java

A modern JavaScript development environment for Minecraft.

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).