Large Open Source Java Project Seeks Contributors: How to Join

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Major Open Source Java Project Seeks Contributors

The Java developer community continues to grow, and today we are covering a landmark event: one of the largest open source projects in the Java ecosystem has officially announced a call for contributors. We are talking about the OpenJDK project — the reference implementation of the Java platform, which is the foundation of all modern Java applications. In the coming months, the OpenJDK team plans to expand its pool of participants, especially among mid-level developers.

Why is this important? OpenJDK is not just a library, but the foundation on which millions of servers, mobile devices, and embedded systems run. Participating in its development offers a unique chance to influence the future of the Java language, gain experience working with the platform core, and enter the elite of the Java community.

What do they offer contributors?

The OpenJDK project is looking for specialists ready to work on the following areas:

Performance Optimization: improving the garbage collector (G1, ZGC), JIT compiler, and thread scheduler.
Security: closing vulnerabilities, code auditing, implementing new cryptographic algorithms.
Porting to New Architectures: adapting OpenJDK for ARM, RISC-V processors, and experimental platforms.
Documentation and Testing: writing unit tests, improving Javadoc, and creating educational materials.

For beginners, the OpenJDK Mentors program is available, where experienced committers will help you understand the code, the review process, and the tooling (Mercurial, JBS, Code Review).

What skills are needed?

To become an OpenJDK contributor, you need:

Solid knowledge of Java (at least 2–3 years of commercial development).
Understanding of JVM internals: memory management, bytecode, class loading.
Experience with Git or Mercurial (the project's main VCS).
Basic Linux skills (building OpenJDK from source).

Knowledge of C++ (part of the HotSpot code is written in it) and experience with profiling using JFR, JMC, or VisualVM will be an additional advantage.

How to get started?

The process of joining the project is as transparent as possible:

Register on the official OpenJDK website and sign the Oracle Contributor Agreement (OCA).
Choose a task from the "Good First Issues" list on JBS (Java Bug System) — they are specially marked for beginners.
Build OpenJDK locally, make changes, run tests, and submit a patch via Code Review (webrev).

The first patch can be small — for example, fixing a typo in documentation or adding a simple test. The main thing is to start.

Why should you try it?

Participating in OpenJDK provides not only technical growth. It is an opportunity to:

Get a reference from world-class Java experts (including authors of the JLS).
Get into the official list of contributors — this is a strong point on your resume.