Depending on what you're working on, "quark.jar" usually refers to one of two things: the PC client for the Nintendo Switch homebrew tool Java-based backend framework 1. Goldleaf Quark (Nintendo Switch Homebrew)

Build the project using Maven: ./mvnw.cmd clean package -DskipTests .

: Open Goldleaf on your Switch, select USB installation , and the console should automatically detect the PC running Quark.