make shutdown hook work correctly

src/main/kotlin/de/wulkanat/Admin.kt

@@ -7,6 +7,8 @@ import net.dv8tion.jda.api.JDA
 import net.dv8tion.jda.api.entities.MessageEmbed
 import net.dv8tion.jda.api.entities.User
 import java.awt.Color
+import java.sql.Time
+import java.util.concurrent.TimeUnit
 
 object Admin {
     val userId: Long
@@ -101,14 +103,14 @@ object Admin {
     }
 
     private fun senDevMessageBlocking(messageEmbed: MessageEmbed, fallback: String) {
+        admin = jda!!.retrieveUserById(userId).complete()
         val devChannel = admin?.openPrivateChannel() ?: kotlin.run {
             kotlin.io.println(fallback)
             return
         }
 
-        devChannel.queue {
-            it.sendMessage(messageEmbed).complete()
-        }
+        devChannel.complete()
+            .sendMessage(messageEmbed).complete()
     }
 
     private fun sendDevMessage(messageEmbed: MessageEmbed, fallback: String) {

src/main/kotlin/de/wulkanat/Main.kt

@@ -25,7 +25,9 @@ fun main() {
     Runtime.getRuntime().addShutdownHook(object : Thread() {
         override fun run() {
             println("Shutting down...")
-            Admin.printlnBlocking("Shutting down")
+            println("Sending shutdown notice to Admin, waiting 5s...")
+            Admin.println("Shutting down")
+            sleep(5000)
         }
     })