semeru-jdk-open@21 ☆
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Description:
Production-ready JDK with the OpenJDK class libraries and the Eclipse OpenJ9 JVM
Type: Cask  |  Latest Version: 21.0.10+7,openj9-0.57.0@0  |  Tracked Since: Dec 28, 2025
Links: Homepage  |  @IBMCloud  |  formulae.brew.sh
Category: Developer tools
Tags: java jdk semeru openj9 ibm runtime
Install: brew install --cask semeru-jdk-open@21
About:
IBM Semeru Runtime is a production-ready Java Development Kit that combines OpenJDK class libraries with the high-performance Eclipse OpenJ9 JVM. This Open Edition provides optimized memory management and fast startup times for Java applications. It is fully compatible with standard Java APIs while offering advanced garbage collection and diagnostic features.
Key Features:
  • Eclipse OpenJ9 JVM for reduced memory footprint and faster startup
  • Fully compatible with OpenJDK 21 specifications and libraries
  • Advanced garbage collection and diagnostic tools
  • Long-term support (LTS) stability for production environments
Use Cases:
  • Running enterprise Java applications with optimized resource usage
  • Microservices and containerized Java workloads requiring fast startup
  • Development environments needing a stable, production-grade JDK
Alternatives:
  • openjdk – Standard OpenJDK without the OpenJ9 JVM optimizations
  • temurin – Community-driven OpenJDK distribution with HotSpot JVM
Version History
Detected Version Rev Change Commit
Jan 30, 2026 4:53pm 21.0.10+7,openj9-0.57.0 0 VERSION_BUMP f78ff620
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