sudo apt update sudo apt install openjdk-11-jre-headless # For Java 11 # OR sudo apt install openjdk-8-jre-headless # For Java 8 Use code with caution.
Check your current UniFi version. Modern installations (v7.3+) generally require . If you use an older controller, you must stick with Java 8 , as newer Java versions (9, 10, or 11) may lack the activation.jar file required for legacy software. 2. Download the Runtime unify java download
To successfully complete a and installation, you must match the Java version to your specific UniFi Network Server (formerly Controller) release. Since version 5.11.47, Ubiquiti no longer bundles Java with the installer, requiring a separate manual installation. Essential Java Versions for UniFi sudo apt update sudo apt install openjdk-11-jre-headless #
Choosing the correct version is the most critical step to ensure your network application launches correctly. UniFi Version Required Java Version Recommended Download Java 11 Oracle JDK 11 or OpenJDK 11 v5.x to v7.2.x Java 8 Oracle JRE 8 (Simplest path) Legacy (Pre-v5) Java 7/8 Legacy Java 8 How to Download and Install Java for UniFi 1. Identify Your Requirements If you use an older controller, you must
Use the following commands to install the stable OpenJDK:
Visit the Java Download Page for Java 8 or the Oracle Java 11 Archive for newer versions. Ensure you select the x64 (64-bit) installer to avoid memory limitations.
