Looker Now Supports Java OpenJDK 21
Looker version 26.8 now officially supports Java OpenJDK 21, with Looker-hosted instances already upgraded. Customer-hosted instances must upgrade to this version and ensure specific Java settings are included if running directly via the java -jar command. This update enhances compatibility and performance for Looker deployments.
Features (1) ›
- Looker
Starting in Looker 26.8, Looker supports Java OpenJDK version 21. Looker-hosted instances have been upgraded to OpenJDK 21. Customer-hosted instances should upgrade to OpenJDK 21 . If you run Looker directly using the java -jar command (instead of using the startup script), you must include these three specific settings: --add-opens=java.base/sun.nio.ch=ALL-UNNAMED --add-opens=java.base/java.io=ALL-UNNAMED --add-opens=java.base/java.nio=ALL-UNNAMED Looker recommends that you transition to new Java updates as they are released. Other versions of Java, Oracle JDK, and OpenJDK are not supported a
https://docs.cloud.google.com/release-notes#July_17_2026
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