Our robot's brain, the RoboRIO, runs your Java. It doesn't run it alone - it stands on libraries:

• •WPILib - the core library FIRST provides (math, hardware, the robot loop)
• •CTRE Phoenix 6 - drives our Kraken/TalonFX motors
• •AdvantageKit - records everything for logging & replay
• •PathPlanner - builds autonomous paths

Each is listed in the project's vendordeps/ folder and wired in build.gradle. You write Java; these do the heavy lifting.