public class MessageListener extends ListenerAdapter {
	public static void main(String[] args) {
		try {
			JDA bot = new JDABuilder(AccountType.BOT)
					.setToken("MyToken")
					.addEventListener(new MessageListener())
					.buildBlocking();
		}catch(LoginException e) {
			e.printStackTrace();

		}catch(InterruptedException e) {
			e.printStackTrace();

		}catch(RateLimitedException e) {

			e.printStackTrace();
		}

	}
	@Override
	public void firstMessage(MessageReceivedEvent event) {
		Message message = event.getMessage();
		String msg = message.getRawContent();
		if(msg.equals("*ping")) {
			MessageChannel channel = event.getChannel();
			channel.sendMessage("pong!").queue();
		}
	}
}