vvcephei commented on a change in pull request #8764:
URL: https://github.com/apache/kafka/pull/8764#discussion_r433487600



##########
File path: 
streams/src/main/java/org/apache/kafka/streams/kstream/internals/foreignkeyjoin/SubscriptionWrapperSerde.java
##########
@@ -63,9 +63,9 @@ public SubscriptionWrapperSerde(final Supplier<String> 
primaryKeySerializationPs
         }
 
         @Override
-        public void setIfUnset(final Serializer<K> defaultSerializer) {
+        public void setIfUnset(final Serializer<K> defaultKeySerializer, final 
Serializer<Void> defaultValueSerializer) {
             if (primaryKeySerializer == null) {
-                primaryKeySerializer = 
Objects.requireNonNull(defaultSerializer, "defaultSerializer cannot be null");
+                primaryKeySerializer = 
Objects.requireNonNull(defaultKeySerializer);

Review comment:
       Oh, hah. Looks like you beat me to it, @bellemare  :) 




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