From 1681b51f04bea0e9898ed75ab7f0d0c229b7ec31 Mon Sep 17 00:00:00 2001
From: Kai Moritz <kai@juplo.de>
Date: Thu, 9 May 2024 09:23:05 +0200
Subject: [PATCH] WIP

---
 pom.xml                                           |  4 ++++
 .../top10/Top10ApplicationConfiguration.java      | 14 ++++++++++----
 .../java/de/juplo/kafka/wordcount/top10/Word.java | 15 +++++++++++++++
 .../de/juplo/kafka/wordcount/top10/WordCount.java |  4 ++++
 4 files changed, 33 insertions(+), 4 deletions(-)
 create mode 100644 src/main/java/de/juplo/kafka/wordcount/top10/Word.java

diff --git a/pom.xml b/pom.xml
index cb7ec14..6ccc687 100644
--- a/pom.xml
+++ b/pom.xml
@@ -31,6 +31,10 @@
 			<groupId>org.apache.kafka</groupId>
 			<artifactId>kafka-streams</artifactId>
 		</dependency>
+		<dependency>
+			<groupId>org.springframework.kafka</groupId>
+			<artifactId>spring-kafka</artifactId>
+		</dependency>
 
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
diff --git a/src/main/java/de/juplo/kafka/wordcount/top10/Top10ApplicationConfiguration.java b/src/main/java/de/juplo/kafka/wordcount/top10/Top10ApplicationConfiguration.java
index 3ea85b8..7b10ccd 100644
--- a/src/main/java/de/juplo/kafka/wordcount/top10/Top10ApplicationConfiguration.java
+++ b/src/main/java/de/juplo/kafka/wordcount/top10/Top10ApplicationConfiguration.java
@@ -3,14 +3,15 @@ package de.juplo.kafka.wordcount.top10;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import lombok.extern.slf4j.Slf4j;
 import org.apache.kafka.clients.consumer.ConsumerConfig;
-import org.apache.kafka.common.serialization.Serdes;
 import org.apache.kafka.streams.StreamsConfig;
-import org.apache.kafka.streams.state.KeyValueBytesStoreSupplier;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.kafka.support.serializer.JsonDeserializer;
+import org.springframework.kafka.support.serializer.JsonSerde;
+import org.springframework.kafka.support.serializer.JsonSerializer;
 
 import java.util.Properties;
 import java.util.concurrent.CompletableFuture;
@@ -30,8 +31,13 @@ public class Top10ApplicationConfiguration
 
 		props.put(StreamsConfig.APPLICATION_ID_CONFIG, properties.getApplicationId());
 		props.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, properties.getBootstrapServer());
-		props.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, Serdes.String().getClass().getName());
-		props.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, Serdes.String().getClass().getName());
+		props.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
+		props.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
+		props.put(JsonSerializer.ADD_TYPE_INFO_HEADERS, false);
+		props.put(JsonDeserializer.TRUSTED_PACKAGES, Word.class.getPackageName());
+		props.put(JsonDeserializer.KEY_DEFAULT_TYPE, Word.class.getName());
+		props.put(JsonDeserializer.VALUE_DEFAULT_TYPE, WordCount.class.getName());
+		props.put(JsonDeserializer.USE_TYPE_INFO_HEADERS, false);
 		props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
 
 		return props;
diff --git a/src/main/java/de/juplo/kafka/wordcount/top10/Word.java b/src/main/java/de/juplo/kafka/wordcount/top10/Word.java
new file mode 100644
index 0000000..e4662bc
--- /dev/null
+++ b/src/main/java/de/juplo/kafka/wordcount/top10/Word.java
@@ -0,0 +1,15 @@
+package de.juplo.kafka.wordcount.top10;
+
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+
+@NoArgsConstructor
+@Data
+@JsonIgnoreProperties(ignoreUnknown = true)
+public class Word
+{
+  private String user;
+  private String word;
+}
diff --git a/src/main/java/de/juplo/kafka/wordcount/top10/WordCount.java b/src/main/java/de/juplo/kafka/wordcount/top10/WordCount.java
index 1dbbed4..69c8bed 100644
--- a/src/main/java/de/juplo/kafka/wordcount/top10/WordCount.java
+++ b/src/main/java/de/juplo/kafka/wordcount/top10/WordCount.java
@@ -1,10 +1,14 @@
 package de.juplo.kafka.wordcount.top10;
 
 
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
 import lombok.Data;
+import lombok.NoArgsConstructor;
 
 
+@NoArgsConstructor
 @Data
+@JsonIgnoreProperties(ignoreUnknown = true)
 public class WordCount
 {
   String user;
-- 
2.20.1