JDA

<dependency>
    <groupId>net.dv8tion</groupId>
    <artifactId>JDA</artifactId>
    <version>VERSION</version>
</dependency>

<repository>
    <id>jcenter</id>
    <name>jcenter-bintray</name>
    <url>https://jcenter.bintray.com</url>
</repository>

<dependency>
    <groupId>net.dv8tion</groupId>
    <artifactId>JDA</artifactId>
    <version>VERSION</version>
    <exclusions>
        <exclusion>
            <groupId>club.minnced</groupId>
            <artifactId>opus-java</artifactId>
        </exclusion>
    </exclusions>
</dependency>

dependencies {
    compile 'net.dv8tion:JDA:VERSION'
}

repositories {
    jcenter()
}

dependencies {
    compile ('net.dv8tion:JDA:VERSION') {
        exclude module: 'opus-java'
    }
}

public class NamuWikiBot extends ListenerAdapter {

    public static void main(String[] args) throws LoginException {

        // 기본 jda를 만들고
        JDA jda = JDABuilder.createDefault("토큰").build();

        // jda에 이벤트를 감지하는 리스너를 넣는다.
        jda.addEventListener(new NamuWikiBot());
    }

    @Override
    public void onMessageReceived(MessageReceivedEvent event) {

        // 받은 메세지 내용이 ping이라면
        if (event.getMessage().getContentRaw().equals("!ping")) {
            // pong라는 내용을 보낸다.
            event.getChannel().sendMessage("pong!").queue();
        }
    }
}