At CodeGym, our goal is not just to teach our students (users) how to code in Java from scratch. We also realize our responsibility for those who complete the course, get all the knowledge that it can provide and start looking for a full time job as a Java developer. We are doing our best to help you succeed in finding your first coding job by providing you with all the information and knowledge on how to become a developer that any company would be willing to hire. Top 8 Open Source GitHub Projects to Level-Up Your Coding - 1

Work on open source GitHub projects to make your resume look taaasty

Those who were looking for their first job as a Java Junior developer upon completing CodeGym’s course know that this task may be not that easy or even very hard, depending on the location you are looking to work at. This is because just knowing Java is not enough to get a job, even if you managed to solve literally every task on CodeGym (with more than 1200 tasks in our course, good luck with that), you would also need some real applicable working experience to be considered worth hiring. So, in order to get a first job you need to have experience that you cannot get without having a job. A good-old catch 22? Not really. One simple and effective way to go around this would be working on some open source projects to get more real knowledge and practice your programming skills. Later you can add these projects to your resume so you could apply to Java Junior Dev jobs with pride, so to speak. GitHub open source projects is one of the best ways to take a part (even if it’s a tiny one) in the development of real big projects, collaborating with other coders and developers. This is why we prepared this top of the most interesting and popular open source Java projects on Github, which is open for Junior-level coders. And by the way, if you have never contributed to an open source project before, here’s a quick guide to help you get started.

Open source Github projects for Java beginners

1. Elasticsearch.

Elasticsearch is a distributed, multitenant-capable full-text search engine developed in Java and meant to be used on cloud platforms. ElasticSearch is based on Apache Lucene, which is a free and open-source full-featured text search engine library written entirely in Java. It is supported by the Apache Software Foundation and is released under the Apache Software License. This open source search engine is able to process full-text queries and supports linguistic search through documents. Being the most popular enterprise search engine (followed by Apache Solr), Elasticsearch has a range of powerful features, such as scalable search, near real-time search and multitenancy support. It is primarily focused on documents that are represented as JSON objects. Indexing creates or updates documents, allowing them to be searched, sorted, and filtered. Website: https://www.elastic.co/ Number of stars on Github: 51.3k.

2. Strongbox.

Strongbox is an OpenSource artifact repository manager written in Java. The developers aim to provide an easy and reliable platform for hosting binary artifacts, regardless of the user's repository layout. Strongbox provides native implementations for various package formats such as Maven, NPM, NuGet and Raw. All implemented package formats are natively written in Java. The goal of the project is to build a universal repository manager that can host and serve artifacts in any of the major formats. Strongbox includes a search engine and search language for finding artifacts. Website: https://strongbox.github.io/ Number of stars on Github: 326

3. TEAMMATES.

TEAMMATES.is a free open source project that allows users to write anonymous reviews about their colleagues, teachers and students. Educational community (teachers and students) is the main target group for this tool. TEAMMATES allows you to create various polls (anonymous or not), members of the same group can rate each other's contributions to projects, while teachers are able to leave their feedback to students. TEAMMATES toolkit has quite an extensive functionality, including personal user profiles and a search engine. Website: https://teammatesv4.appspot.com/ Number of stars on Github: 1.1k

4. JabRef.

JabRef is an open source graphic cross-platform citation and reference management system. Written in Java, it uses BibTeX (BibTeX is a specialized software for creating formatted bibliography lists) and BibLaTeX as its native formats. JabRef stands for Java, Alver, Batada, Reference. JabRef provides a graphical user interface for editing BibTeX files, importing data from scientific databases, and searching and managing BibTeX files. The system allows researchers, scholars and writers to create and reuse bibliographic references. New links are used to create a bibliography, a list of bibliographic references in scientific articles, monographs, books and other works. JabRef implements full-text search across the entire bibliography, supports grouping by any BibTeX fields, keywords, provides automatic creation of BibTeX keys, etc. Website: https://www.jabref.org/ Number of stars on Github: 1.9k

5. Wikimedia Commons Android App.

This project is focused on the development of Wikimedia Commons Android App, which allows users to upload images and other types of content to Wikimedia Commons directly from their Android mobile devices. Wikimedia Commons is an online repository of free-use images, sounds, other media, and JSON files. It is a project of the Wikimedia Foundation. Website: https://commons.wikimedia.org/wiki/Commons:Mobile_app Number of stars on Github: 611

6. XWiki.

XWiki is a free software enterprise wiki platform written in Java. It is focused on extensibility and allowing users to structure the content and program software access to a wiki database. Basically, XWiki is just a wiki engine that allows you to create new applications in wiki pages. The developers of the project call XWiki a second generation of wiki platforms. “First generation wiki was designed for collaboration on content. A second generation wiki is suitable for co-creating web applications using the wiki paradigm and page editing approach. XWiki can be used by both second and first generation wikis,” the developers explain on the project’s website. XWiki has quite a lot of features, including page and access control systems, page export to PDF, statistics, blogs, hotkeys, RSS and more. Website: https://www.xwiki.org/

7. Zerocode.

Zerocode is a free and open source API automation and load testing framework built using core Java JUnit components. It allows developers to create and maintain test cases in the most simple and quick way possible. According to the project developers, Zerocode allows you to create test cases for your functions and maintain them easily, avoiding most common problems. Testing is simplified with YAML / JSON formats and native support of popular IDEs such as Eclipse, IntelliJ and NetBeans, no additional plugins required. Website: https://zerocode.io/ Number of stars on Github: 411

8. SirixDB.

SirixDB is a temporal, evolutionary database system, which uses an accumulate only approach. It keeps the full history of each resource and facilitates effective and efficient storing and querying of your temporal data.. Every commit stores a space-efficient snapshot through structural sharing. It is log-structured and never overwrites data. SirixDB uses a novel page-level versioning approach called sliding snapshot. What is a temporal database, you wonder? It’s a system capable of quickly restoring past data states before certain changes are made. “Since most modern databases still simply store current or past data in one large table, we started with investigating the performance of such systems to improve the current state of affairs. From scratch we created an open source system called Sirix that keeps records small and also supports complex timing queries, effectively competing with non-temporary database systems,” the members of SirixDB community explain. Website: https://sirix.io/ Number of stars on Github: 565.Max Heap in Java - 6