如何使用JDA将onReady事件添加到程序中？

如何解决如何使用JDA将onReady事件添加到程序中？

我正在编写一个不和谐的机器人，该机器人在发送onReady事件时会调用Pinger.Scheduler函数。这是机器人的主要类别：

import net.dv8tion.jda.api.AccountType;
import net.dv8tion.jda.api.JDA;
import net.dv8tion.jda.api.JDABuilder;
import net.dv8tion.jda.api.OnlineStatus;
import net.dv8tion.jda.api.entities.Activity;

public class DiscPings {
    public static void main(String[] args) throws Exception{
        String botToken = "bottokenherelmao";

        JDA jda = new JDABuilder(AccountType.BOT)
                .setToken(botToken)
                .setActivity(Activity.listening("to my pings"))
                .setStatus(OnlineStatus.ONLINE)
                .addEventListeners(new Events())
                .build();

    }

}    

这是事件类：

import net.dv8tion.jda.api.events.ReadyEvent;
import net.dv8tion.jda.api.hooks.ListenerAdapter;

public class Events extends ListenerAdapter {
    public void onReady(ReadyEvent event) {
        System.out.println("success");
        Pinger.Scheduler("bell",event.getJDA());
    }
}

运行时，终端显示：

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
SLF4J: Failed to load class "org.slf4j.impl.StaticMDCBinder".
SLF4J: Defaulting to no-operation MDCAdapter implementation.
SLF4J: See http://www.slf4j.org/codes.html#no_static_mdc_binder for further details.
[main] INFO JDA - Login Successful!
[JDA MainWS-ReadThread] INFO WebSocketClient - Connected to WebSocket

onReady方法未运行，Pinger.Scheduler方法也未运行。如何使onReady事件正常运行？