diff --git a/src/main/java/mops/gruppen2/controller/Gruppen2Controller.java b/src/main/java/mops/gruppen2/controller/Gruppen2Controller.java
index 8ca06b6..89a81d2 100644
--- a/src/main/java/mops/gruppen2/controller/Gruppen2Controller.java
+++ b/src/main/java/mops/gruppen2/controller/Gruppen2Controller.java
@@ -81,6 +81,7 @@ public class Gruppen2Controller {
         return "search";
     }
 
+
     @PostMapping("/createGroup")
     public String pCreateGroup(KeycloakAuthenticationToken token,
                                @RequestParam(value = "title") String title,
diff --git a/src/main/java/mops/gruppen2/domain/Group.java b/src/main/java/mops/gruppen2/domain/Group.java
index b7e95eb..a235010 100644
--- a/src/main/java/mops/gruppen2/domain/Group.java
+++ b/src/main/java/mops/gruppen2/domain/Group.java
@@ -33,26 +33,6 @@ public class Group {
         this.roles = new HashMap<>();
     }
 
-    private void applyEvent(UpdateRoleEvent event) throws UserNotFoundException {
-        User user;
-
-        Optional<User> userOptional = members.stream()
-                .filter(u -> u.getUser_id().equals(event.getUser_id()))
-                .findFirst();
-
-        if (userOptional.isPresent()) {
-            user = userOptional.get();
-        } else {
-            throw new UserNotFoundException("Nutzer wurde nicht gefunden!");
-        }
-
-        if (roles.containsKey(user) && event.getNewRole() == Role.MEMBER) {
-            roles.remove(user);
-        } else {
-            roles.put(user.getUser_id(), event.getNewRole());
-        }
-    }
-
     private void applyEvent(AddUserEvent event) throws UserAlreadyExistsException {
         User user = new User(event.getUser_id(), event.getGivenname(), event.getFamilyname(), event.getEmail());
 
diff --git a/src/main/java/mops/gruppen2/domain/event/UpdateRoleEvent.java b/src/main/java/mops/gruppen2/domain/event/UpdateRoleEvent.java
index 7d5f95c..defa1d3 100644
--- a/src/main/java/mops/gruppen2/domain/event/UpdateRoleEvent.java
+++ b/src/main/java/mops/gruppen2/domain/event/UpdateRoleEvent.java
@@ -1,7 +1,12 @@
 package mops.gruppen2.domain.event;
 
 import lombok.*;
+import mops.gruppen2.domain.Exceptions.UserNotFoundException;
+import mops.gruppen2.domain.Group;
 import mops.gruppen2.domain.Role;
+import mops.gruppen2.domain.User;
+
+import java.util.Optional;
 
 /**
  * Aktualisiert die Gruppenrolle eines Teilnehmers.
@@ -23,4 +28,24 @@ public class UpdateRoleEvent extends Event {
         this.newRole = newRole;
     }
 
+    private void apply(Group group) throws UserNotFoundException {
+        User user;
+
+        Optional<User> userOptional = group.getMembers().stream()
+                .filter(u -> u.getUser_id().equals(user_id))
+                .findFirst();
+
+        if (userOptional.isPresent()) {
+            user = userOptional.get();
+        } else {
+            throw new UserNotFoundException("Nutzer wurde nicht gefunden!");
+        }
+
+        if (group.getRoles().containsKey(user) && newRole == Role.MEMBER) {
+            group.getRoles().remove(user);
+        } else {
+            group.getRoles().put(user.getUser_id(), newRole);
+        }
+    }
+
 }