Create your Discord Bot with aluna-spring-boot-starter - PingCommand

PingCommand.kt

@Interaction
class PingCommand : DiscordCommand("ping", "Send a ping command") {

    override fun execute(event: SlashCommandInteractionEvent) {
        //Reply to the user
        val startTime = System.currentTimeMillis()
        event.reply("Ping ...").setEphemeral(true).queue {
            it.editOriginal("Pong: ${System.currentTimeMillis() - startTime}ms").queue()
        }
    }
}