# OpenJDK

23 Hacker News commenters recommended OpenJDK and 7 criticized it, November 2025 to November 2026. It was recommended in 10 of 13 months. It meets the Hacker Approved badge rule.

**Verdict:** Free, open-source Java implementation that people use as their default JDK, praised for steady language and runtime improvements. Critics point to Oracle's influence and gaps against other JVMs.

## Why people recommend it

- Steady language and runtime improvements (6 comments): "Java has seen a huge improvement both on the language and runtime front." ([source](https://news.ycombinator.com/item?id=48596469)) "OpenJDK is one of the best success stories of this." ([source](https://news.ycombinator.com/item?id=47962477)) "I built a new telemetry framework into OpenJDK 26." ([source](https://news.ycombinator.com/item?id=47137521))
- Default choice many people just use (4 comments): "Personally I just use the OpenJDK builds provided by my linux distro and never give it a second thought." ([source](https://news.ycombinator.com/item?id=46843563)) "I've yet to run into a situation where I'd want to install anything except OpenJDK" ([source](https://news.ycombinator.com/item?id=46076272)) "nowadays brew install openjdk@21 + adding path to shellrc is doing the trick" ([source](https://news.ycombinator.com/item?id=47006772))
- Free open-source under Linux-style license (3 comments): "made the open-source (same license as Linux) OpenJDK the reference implementation" ([source](https://news.ycombinator.com/item?id=46132693)) "completely open-source with the same license as the Linux kernel" ([source](https://news.ycombinator.com/item?id=47466480)) "OpenJDK is free and libre." ([source](https://news.ycombinator.com/item?id=48859611))
- Professional, well-run open project (2 comments): "There is just a high level of a professionalism around the whole project." ([source](https://news.ycombinator.com/item?id=49122572)) "OpenJDK is one of the best success stories of this." ([source](https://news.ycombinator.com/item?id=47962477))

## What people warn about

- Oracle control and gatekeeping contributions (2 comments): "It's not common for a random company to gatekeep contributions to a community project" ([source](https://news.ycombinator.com/item?id=46842649)) "even OpenJDK is pretty much owned and controlled by Oracle" ([source](https://news.ycombinator.com/item?id=46842644))
- Behind other JVMs on some features (2 comments): "This is only an issue on OpenJDK, other JVM implementations have had AOT tooling for quite some time." ([source](https://news.ycombinator.com/item?id=50141229)) "GraalVM is better than OpenJDK" ([source](https://news.ycombinator.com/item?id=49297792))

## Alternatives hackers recommend

- [JDK](https://hackerapproved.com/p/jdk-28.md): 8 recommend
- [Java Development Kit (JDK)](https://hackerapproved.com/p/java-development-kit.md): 6 recommend

## Cite as

Hacker Approved, "OpenJDK", https://hackerapproved.com/p/openjdk/ (counts from 1,795,640 Hacker News comments, November 2025 to November 2026).