Most welcoming Java repos

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AloisSeckar/demos-java

From Java 11 to Java 26 - new features in practical examples

Java★ 26 stars

Outside contributors get real replies here, and their work gets merged.

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jvondermarck/dinosaur-exploder

🦖 Classic arcade shoot 'em up built with Java & FXGL. Contributions welcome – game & Next.js docs.

Java · TypeScript★ 110 stars

An issue to start with#405 [Bug]: Cursor texture corrupted after loading Japanese font glyphs (opens GitHub)

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checkstyle/checkstyle

Checkstyle is a development tool to help programmers write Java code that adheres to a coding standard. By default it supports the Google Java Style Guide and Sun Code Conventions, but is highly configurable. It can be invoked with an ANT task and a command line program.

Java★ 9.6k stars

Outside contributors get real replies here, and their work gets merged.

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plantuml/plantuml

Generate diagrams from textual description

Java★ 13k stars

Outside contributors get real replies here, and their work gets merged.

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eclipse-openj9/openj9

Eclipse OpenJ9: A Java Virtual Machine for OpenJDK that's optimized for small footprint, fast start-up, and high throughput. Builds on Eclipse OMR (https://github.com/eclipse/omr) and combines with the Extensions for OpenJDK for OpenJ9 repo.

Java · C++★ 3.5k stars

An issue to start with#24803 Replace `scanMonitorLookupCaches()` loop with memset (opens GitHub)

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pmd/pmd

An extensible multilanguage static code analyzer.

Java★ 5.5k stars

Outside contributors get real replies here, and their work gets merged.

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SasanLabs/VulnerableApp

OWASP VulnerableApp Project: Break it. Scan it. Reproduce it. Benchmark against it. Improve it.

Java★ 467 stars

An issue to start with#750 [Community Testing] Reflected XSS (opens GitHub)

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apache/beam

Apache Beam is a unified programming model for Batch and Streaming data processing.

Java · Python★ 8.7k stars

Outside contributors get real replies here, and their work gets merged.

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processing/processing4

Source code for Processing, the software sketchbook and Java-based programming language for students, artists, designers, educators, hobbyists, and creative coders. Includes the core library, and editor (PDE)

Java★ 507 stars

Outside contributors get real replies here, and their work gets merged.

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cryptomator/cryptomator

Cryptomator for Windows, macOS, and Linux: Secure client-side encryption for your cloud storage, ensuring privacy and control over your data.

Java★ 16k stars

Outside contributors get real replies here, and their work gets merged.

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bisq-network/bisq

A decentralized bitcoin exchange network

Java★ 5.1k stars

Outside contributors get real replies here, and their work gets merged. Replies are slow here: typically 8.2 days, beyond your 7-day budget.

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libgdx/libgdx

Desktop/Android/HTML5/iOS Java game development framework

Java · C++★ 25k stars

Outside contributors get real replies here, and their work gets merged.

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assertj/assertj

Fluent testing assertions for Java and the JVM

Java★ 2.8k stars

Outside contributors get real replies here, and their work gets merged.

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lysine-dev/retrofit

A type-safe HTTP client for Android and the JVM

Java★ 44k stars

Outside contributors get real replies here, and their work gets merged.

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dbeaver/dbeaver

Free universal database tool and SQL client

Java★ 52k stars

Outside contributors get real replies here, and their work gets merged.

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oracle/opengrok

OpenGrok is a fast and usable source code search and cross reference engine, written in Java

Java · HTML★ 5.0k stars

An issue to start with#5035 Bazaar repository tests should actually run bzr (opens GitHub)1 open pull request

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elastic/logstash

Logstash - transport and process your logs, events, or other data

Java · Ruby★ 15k stars

An issue to start with#19383 [Doc] VPR enhancement: improve PR visibility when created. (opens GitHub)1 person already on it

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JabRef/jabref

Desktop app for managing BibTeX and BibLaTeX (.bib) libraries

Java★ 4.8k stars

Outside contributors get real replies here, and their work gets merged.

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OpenRefine/OpenRefine

OpenRefine is a free, open source power tool for working with messy data and improving it

Java · JavaScript★ 12k stars

Outside contributors get real replies here, and their work gets merged.

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kestra-io/kestra

Event Driven Orchestration & Scheduling Platform for Mission Critical Applications

Java · TypeScript★ 29k stars

An issue to start with#19964 Add unit tests for the service state to execution status mapping (opens GitHub)

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prestodb/presto

The official home of the Presto distributed SQL query engine for big data

Java★ 17k stars

An issue to start with#26779 Add iceberg rewrite_table_path procedure to Presto (opens GitHub)1 open pull request

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trinodb/trino

Official repository of Trino, the distributed SQL query engine for big data, formerly known as PrestoSQL (https://trino.io)

Java★ 13k stars

An issue to start with#28176 dependabot-originating builds fail due to lack of secrets (opens GitHub)1 open pull request

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jenkinsci/jenkins

Jenkins automation server

Java★ 27k stars

Outside contributors get real replies here, and their work gets merged.

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MovingBlocks/Terasology

Terasology - open source voxel world

Java★ 3.9k stars

Outside contributors get real replies here, and their work gets merged.

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GoogleContainerTools/jib

🏗 Build container images for your Java applications.

Java★ 14k stars

Outside contributors get merged here, though some wait a while for a reply. Replies are slow here: typically 19.1 days, beyond your 7-day budget.

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Stirling-Tools/Stirling-PDF

#1 PDF Application on GitHub that lets you edit PDFs on any device anywhere

Java · TypeScript★ 93k stars

An issue to start with#8181 docs: counter_translation.md describes the removed script and .properties layout (opens GitHub)