mjsax commented on a change in pull request #10813:
URL: https://github.com/apache/kafka/pull/10813#discussion_r661899168



##########
File path: 
streams/src/main/java/org/apache/kafka/streams/state/internals/KeyAndJoinSideDeserializer.java
##########
@@ -31,13 +32,14 @@
         this.keyDeserializer = keyDeserializer;
     }
 
+    @SuppressWarnings("unchecked")
     @Override
-    public void setIfUnset(final Deserializer<K> defaultKeyDeserializer, final 
Deserializer<Void> defaultValueDeserializer) {
+    public void setIfUnset(final SerdeGetter getter) {
         if (keyDeserializer == null) {
-            keyDeserializer = Objects.requireNonNull(defaultKeyDeserializer, 
"defaultKeyDeserializer cannot be null");
+            keyDeserializer = (Deserializer<K>) 
Objects.requireNonNull(getter.keySerde().deserializer(), 
"defaultKeyDeserializer cannot be null");

Review comment:
       as above




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