killbill-aplcache

diff --git a/util/src/test/java/org/killbill/billing/mock/api/MockExtBusEvent.java b/util/src/test/java/org/killbill/billing/mock/api/MockExtBusEvent.java
index f11209e..591327f 100644
--- a/util/src/test/java/org/killbill/billing/mock/api/MockExtBusEvent.java
+++ b/util/src/test/java/org/killbill/billing/mock/api/MockExtBusEvent.java
@@ -78,6 +78,11 @@ public class MockExtBusEvent implements ExtBusEvent {
     }
 
     @Override
+    public UUID getUserToken() {
+        return null;
+    }
+
+    @Override
     public String toString() {
         return "MockExtBusEvent [eventType=" + eventType + ", objectType="
                + objectType + ", objectId=" + objectId + ", accountId="