IBM Semeru Runtime (JDK 21) Open Edition for Mac
Production-ready JDK with the OpenJDK class libraries and the Eclipse OpenJ9 JVM
brew install --cask semeru-jdk-open@21. Homebrew metadata does not declare a licence. Homebrew recorded 35 installs in the last 30 days. What is IBM Semeru Runtime (JDK 21) Open Edition?
IBM Semeru Runtime (JDK 21) Open Edition is a macOS utility: Production-ready JDK with the OpenJDK class libraries and the Eclipse OpenJ9 JVM.
It is distributed as a Homebrew cask, which installs the .app into /Applications. This project is open source; the code is at https://developer.ibm.com/languages/semeru-runtimes/.
How to install IBM Semeru Runtime (JDK 21) Open Edition
- Open Terminal (press ⌘ + Space and type “Terminal”).
- If Homebrew is not installed, run the install command below first.
- Run
brew install --cask semeru-jdk-open@21.
Install Homebrew first if needed:
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Frequently asked questions
How do I install IBM Semeru Runtime (JDK 21) Open Edition on a Mac?
Run brew install --cask semeru-jdk-open@21 in Terminal. This requires Homebrew; install it first with the command below if needed.
Is IBM Semeru Runtime (JDK 21) Open Edition open source?
Homebrew metadata does not declare a licence for this app. Check the official website for the exact terms.
Does IBM Semeru Runtime (JDK 21) Open Edition run on Apple silicon?
Yes, it ships a universal binary.
How popular is IBM Semeru Runtime (JDK 21) Open Edition?
Homebrew analytics recorded 35 installs in the last 30 days, ranking it #5284 in this catalogue.
What version of IBM Semeru Runtime (JDK 21) Open Edition is current?
The latest packaged version is 21.0.12.15.
Data comes from the public Homebrew API, last updated 2026-10-27. Install counts only include Homebrew installs and are not total users.