Commands

public class HelloCommand extends AbstractPlayerCommand {
    public HelloCommand() {
        super("hello");
    }
    @Override
    public void execute(ServerPlayer player, Arguments args) {
        player.sendMessage(Component.text("Hello, " + player.getName() + "!"));
    }
}

@Override
public void setup() {
    getServer().getCommandManager()
        .register(new HelloCommand());
}

public class TeleportCommand extends AbstractPlayerCommand {
    public TeleportCommand() {
        super("tp");
        // Define arguments
        addArgument(new DoubleArgument("x"));
        addArgument(new DoubleArgument("y"));
        addArgument(new DoubleArgument("z"));
    }
    @Override
    public void execute(ServerPlayer player, Arguments args) {
        double x = args.get("x", Double.class);
        double y = args.get("y", Double.class);
        double z = args.get("z", Double.class);
        // Teleport using Teleport component
        Ref<EntityStore> ref = player.getEntityRef();
        ref.add(Teleport.getComponentType(),
            new Teleport(new Vector3d(x, y, z)));
        player.sendMessage(Component.text("Teleported!"));
    }
}