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The JDK is required to build the robot's code. We're currently using JDK 11. Do not use older JDKs (such as JDK 8) for compatibility reasons.
The JDK is available from Adoptium: https://adoptium.net/
Download the one named JDK 11, and make sure HotSpot is selected as the JVM.
Installation proceeds like any other standard installer. Be wary of the bundled software in some of the installers.