OSS gives you a great start. Beginners might start by fixing minor things, such as a bug in a library, sending a pull request, or even writing a piece of documentation. However, beginner developers can also learn to write so-called “clean code” – code that is readable and maintainable – while contributing to open source projects. When developers realize that their code is exposed to the world, it makes them focus on making that code easy to understand and support. Programmers stick to generally accepted rules within a team, which include norms for indents, descriptions of methods and classes, variable names, and following the don’t-repeat-yourself rule. In a nutshell, when contributing to free projects you’re obliged to conform to the norms of a project.
Java is an object-oriented programming language used for building mobile, desktop, web and embedded applications.
As a Developer, contributing to an open-source project is good to scale faster. Events like Hacktoberfest even give out prices to encourage open source contribution.
Learning about the most popular projects can help you catch on to the industry trends and prepare yourself accordingly. Here are some of the best Java open source projects:
1. Java Design Patterns
Design patterns are among the most useful practices for a programmer. They help you speed up the programming process by solving general problems much quicker. Design patterns provide you with tested development paradigms, so the development process becomes quick and straightforward.
You can reuse design patterns to avoid small errors and issues, leading to significant problems in your project. Another advantage of design patterns is they enhance your code’s readability for others.
As the name suggests, Java design patterns is a collection of design patterns for Java. A product of seasoned architects and programmers, the patterns help you simplify development with Java. The project requires you to be familiar with the numerous Software Design Principles.
All the patterns in this project have useful descriptions to understand where you should use a particular pattern and where you shouldn’t. We recommend learning more about this project as it’s a must-have for every Java programmer. It has over 62 thousand stars on GitHub, so you can understand how popular it is.
If you’re interested in the Internet of Things (IoT), then you must get acquainted with Arduino. It is an open-source electronics platform based on simple software and hardware. An Arduino board can read various inputs such as a finger pressing a button, a tweet, or a light on a sensor and convert it into an output, such as turning on a torch, activating a system, or publishing something.
As a microcontroller platform, it’s very accessible and easy to use. It has cross-platform compatibility as it can run on Mac OSX, Windows, and Linux. Even though it is quite simple to use, its versatility and flexibility make it suitable for experienced programmers.
If you want to use Java in IoT, then learning about Arduino would surely be a significant step. Its GitHub repository has more than ten thousand stars, so you can understand how popular it is.
Blynk is a prominent Internet of Things solution that allows to build web and mobile applications for the Internet of Things. You can use this platform to connect more than 400 hardware models such as ESP8266, Raspberry Pi, Arduino, and Raspberry Pi with drag and drop IoT mobile apps within a few minutes.
Blynk lets you connect your devices to design apps, the cloud, and analyze telemetry data. It is undoubtedly among the most prominent Java open source projects. If you’re interested in learning about IoT, then you should definitely start with Blynk. It is fast and provides you with proper connection management. Apart from those advantages, it allows you to connect with public and private servers. Its primary server is based on Java, so you can learn a lot from it.
If you’re interested in gaming and video game development, then this project is perfect for you. Mindustry is a resource management strategy game written in Java. You can check its code and see how the game works. It has more than six thousand stars on Github, so you can understand how popular it has become. If you want to learn about video game programming, getting familiar with this project will surely help.
Sndcpy is a neat solution for android audio forwarding. You can say that it’s scrcpy but for Android. Scrcpy is an open-source application for screen mirroring that lets you control an Android device from a macOS, Windows, or Linux desktop computer. Sndcpy enables you to forward audio from an Android ten device to your computer without needing any root access.
It is compatible with Windows, macOS, and Linux operating systems. As it is written in Java, you can learn a lot about it through its source code. Sndcpy is one of the best Java open source project ideas as you can try to replicate this solution and learn a lot about Java mobile development.
6. Termux Application
Termux is a terminal emulator for Android. A big reason behind its immense popularity is its extensive collection of Linux packages. It lets you edit files with vim and nano, connect to servers over ssh, use the Python console as a calculator, or use frotz to run text-based games.
Learning about this project can teach you a lot about terminal emulation and Java mobile development. You can understand how popular it is when you consider that it has more than 6.7 thousand stars on its GitHub page.
7. Tsunami Security Scanner
Tsunami is a network security scanner. Its primary advantage is its extensive plugin system that allows you to detect severe vulnerabilities easily. Tsunami’s plugins are its biggest strength, and it relies on them to perform all kinds of scanning tasks. Even though it is in pre-alpha release, it has garnered more than six thousand stars on its Github page. So you can understand how prominent this project is.
8. Signal Android
Signal is a privacy-focused messaging app for Android devices. It is among the most prominent Java projects on GitHub with more than 14 thousand stars. It uses a phone’s data connection to communicate. Moreover, Signal can encrypt the messages stored on the user’s phone too.
You can check out its GitHub page and take inspiration from this project to create your own private messaging app. That would surely be among the best Java open source project ideas as building a private messaging app can teach you a lot about cryptography.
Whether you are a dedicated Java developer or a system administrator responsible for developing and maintaining Java applications, you know that the absence of good third-party libraries and frameworks can sometimes spoil the fun. This is not to say that Java lacks in functionalities or that it isn’t powerful enough to complete the most demanding tasks, but it is important to note that there’s no better way to get your work done than with the help of open source tools.