Update

src/main/scala/net/dergrimm/keycloak/providers/events/mqtt/MqttEventListenerProvider.scala

@@ -31,7 +31,6 @@ import akka.util.ByteString
 import akka.stream.scaladsl.Source
 import scala.util.Success
 import scala.util.Failure
-import concurrent.ExecutionContext.Implicits.global
 
 class MqttEventListenerProvider(
     val session: KeycloakSession,
@@ -65,6 +64,7 @@ class MqttEventListenerProvider(
   override def close(): Unit = {}
 
   private def sendMessage(payload: Payload): Unit =
+    import concurrent.ExecutionContext.Implicits.global
     import MqttEventListenerProviderFactory.system
 
     val topic = s"${mqttOptions.topic}/${payload.topic}"
@@ -81,3 +81,4 @@ class MqttEventListenerProvider(
           s"Failed to publish message: ${exception.getMessage()}"
         )
     }
+end MqttEventListenerProvider

src/main/scala/net/dergrimm/keycloak/providers/events/mqtt/MqttEventListenerProviderFactory.scala

@@ -37,6 +37,7 @@ object MqttEventListenerProviderFactory:
   private val PUBLISHER_ID = "keycloak"
 
   implicit val system: ActorSystem = ActorSystem()
+end MqttEventListenerProviderFactory
 
 class MqttEventListenerProviderFactory(
     var data: MqttEventListenerProviderFactoryData
@@ -118,3 +119,4 @@ class MqttEventListenerProviderFactory(
   override def close(): Unit = {}
 
   override def getId(): String = MqttEventListenerProviderFactory.PLUGIN_ID
+end MqttEventListenerProviderFactory

src/main/scala/net/dergrimm/keycloak/providers/events/mqtt/MqttOptions.scala

@@ -38,6 +38,7 @@ object MqttOptions:
       retained,
       qos
     )
+end MqttOptions
 
 private final case class MqttOptions(
     topic: String,

src/main/scala/net/dergrimm/keycloak/providers/events/mqtt/Payload.scala

@@ -60,6 +60,7 @@ object Payload:
       error,
       resourceTypeAsString = event.getResourceTypeAsString()
     )
+end Payload
 
 private final case class Payload(
     admin: Boolean,

src/main/scala/net/dergrimm/keycloak/providers/events/mqtt/PayloadAuthDetails.scala

@@ -38,6 +38,7 @@ object PayloadAuthDetails:
       userId = auth.getClientId(),
       ipAddress = auth.getIpAddress()
     )
+end PayloadAuthDetails
 
 private final case class PayloadAuthDetails(
     realmId: String,