From: Kai Moritz <kai@juplo.de>
Date: Wed, 5 Jun 2024 21:57:32 +0000 (+0200)
Subject: counter: 1.3.0 - (GREEN) Fixed the typing for the state-store
X-Git-Tag: popular-on-counter~5
X-Git-Url: http://juplo.de/gitweb/?a=commitdiff_plain;h=98f4de98c6c3f527496d85b5e32fef0a3a23cbd5;p=demos%2Fkafka%2Fwordcount

counter: 1.3.0 - (GREEN) Fixed the typing for the state-store
---

diff --git a/src/main/java/de/juplo/kafka/wordcount/counter/CounterStreamProcessor.java b/src/main/java/de/juplo/kafka/wordcount/counter/CounterStreamProcessor.java
index fd5c5a7..64bd619 100644
--- a/src/main/java/de/juplo/kafka/wordcount/counter/CounterStreamProcessor.java
+++ b/src/main/java/de/juplo/kafka/wordcount/counter/CounterStreamProcessor.java
@@ -7,6 +7,7 @@ import org.apache.kafka.streams.kstream.Materialized;
 import org.apache.kafka.streams.state.KeyValueBytesStoreSupplier;
 import org.apache.kafka.streams.state.QueryableStoreTypes;
 import org.apache.kafka.streams.state.ReadOnlyKeyValueStore;
+import org.springframework.kafka.support.serializer.JsonSerde;
 
 import java.util.Properties;
 
@@ -46,7 +47,10 @@ public class CounterStreamProcessor
 		source
 				.map((key, word) -> new KeyValue<>(word, word))
 				.groupByKey()
-				.count(Materialized.as(storeSupplier))
+				.count(
+						Materialized
+								.<Word, Long>as(storeSupplier)
+								.withKeySerde(new JsonSerde<>().copyWithType(Word.class).forKeys()))
 				.toStream()
 				.map((word, counter) -> new KeyValue<>(word, WordCounter.of(word, counter)))
 				.to(outputTopic);