From: Kai Moritz <kai@juplo.de>
Date: Tue, 18 Mar 2025 16:13:57 +0000 (+0100)
Subject: Umbau auf Autoconfig von Spring Kafka
X-Git-Url: https://juplo.de/gitweb/?a=commitdiff_plain;h=refs%2Fheads%2Fspring%2Fspring-consumer--autoconfig;p=demos%2Fkafka%2Ftraining

Umbau auf Autoconfig von Spring Kafka
---

diff --git a/pom.xml b/pom.xml
index dd96d00f..a5197c8f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -40,8 +40,8 @@
       <artifactId>spring-boot-starter-validation</artifactId>
     </dependency>
     <dependency>
-      <groupId>org.apache.kafka</groupId>
-      <artifactId>kafka-clients</artifactId>
+      <groupId>org.springframework.kafka</groupId>
+      <artifactId>spring-kafka</artifactId>
     </dependency>
     <dependency>
       <groupId>org.projectlombok</groupId>
@@ -53,11 +53,6 @@
       <artifactId>spring-boot-starter-test</artifactId>
       <scope>test</scope>
     </dependency>
-    <dependency>
-      <groupId>org.springframework.kafka</groupId>
-      <artifactId>spring-kafka</artifactId>
-      <scope>test</scope>
-    </dependency>
     <dependency>
       <groupId>org.springframework.kafka</groupId>
       <artifactId>spring-kafka-test</artifactId>
diff --git a/src/main/java/de/juplo/kafka/ApplicationConfiguration.java b/src/main/java/de/juplo/kafka/ApplicationConfiguration.java
index b98c401d..adf6a085 100644
--- a/src/main/java/de/juplo/kafka/ApplicationConfiguration.java
+++ b/src/main/java/de/juplo/kafka/ApplicationConfiguration.java
@@ -1,55 +1,34 @@
 package de.juplo.kafka;
 
 import org.apache.kafka.clients.consumer.Consumer;
-import org.apache.kafka.clients.consumer.KafkaConsumer;
-import org.apache.kafka.clients.consumer.StickyAssignor;
-import org.apache.kafka.common.serialization.StringDeserializer;
-import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.beans.factory.annotation.Value;
 import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
-
-import java.util.Properties;
+import org.springframework.kafka.core.ConsumerFactory;
 
 
 @Configuration
-@EnableConfigurationProperties(ApplicationProperties.class)
 public class ApplicationConfiguration
 {
   @Bean
   public ExampleConsumer exampleConsumer(
     Consumer<String, String> kafkaConsumer,
-    ApplicationProperties properties,
+    @Value("${spring.kafka.client-id}") String clientId,
+    @Value("${juplo.consumer.topic}") String topic,
     ConfigurableApplicationContext applicationContext)
   {
     return
       new ExampleConsumer(
-        properties.getClientId(),
-        properties.getConsumerProperties().getTopic(),
+        clientId,
+        topic,
         kafkaConsumer,
         () -> applicationContext.close());
   }
 
   @Bean(destroyMethod = "")
-  public KafkaConsumer<String, String> kafkaConsumer(ApplicationProperties properties)
+  public Consumer<?, ?> kafkaConsumer(ConsumerFactory<?, ?> consumerFactory)
   {
-    Properties props = new Properties();
-    props.put("bootstrap.servers", properties.getBootstrapServer());
-    props.put("client.id", properties.getClientId());
-    props.put("group.id", properties.getConsumerProperties().getGroupId());
-    if (properties.getConsumerProperties().getAutoOffsetReset() != null)
-    {
-      props.put("auto.offset.reset", properties.getConsumerProperties().getAutoOffsetReset().name());
-    }
-    if (properties.getConsumerProperties().getAutoCommitInterval() != null)
-    {
-      props.put("auto.commit.interval", properties.getConsumerProperties().getAutoCommitInterval());
-    }
-    props.put("metadata.maxage.ms", 5000); //  5 Sekunden
-    props.put("partition.assignment.strategy", StickyAssignor.class.getName());
-    props.put("key.deserializer", StringDeserializer.class.getName());
-    props.put("value.deserializer", StringDeserializer.class.getName());
-
-    return new KafkaConsumer<>(props);
+    return consumerFactory.createConsumer();
   }
 }
diff --git a/src/main/java/de/juplo/kafka/ApplicationProperties.java b/src/main/java/de/juplo/kafka/ApplicationProperties.java
deleted file mode 100644
index c8193c9f..00000000
--- a/src/main/java/de/juplo/kafka/ApplicationProperties.java
+++ /dev/null
@@ -1,52 +0,0 @@
-package de.juplo.kafka;
-
-import jakarta.validation.constraints.NotEmpty;
-import jakarta.validation.constraints.NotNull;
-import lombok.Getter;
-import lombok.Setter;
-import org.springframework.boot.context.properties.ConfigurationProperties;
-import org.springframework.validation.annotation.Validated;
-
-import java.time.Duration;
-
-
-@ConfigurationProperties(prefix = "juplo")
-@Validated
-@Getter
-@Setter
-public class ApplicationProperties
-{
-  @NotNull
-  @NotEmpty
-  private String bootstrapServer;
-  @NotNull
-  @NotEmpty
-  private String clientId;
-
-  @NotNull
-  private ConsumerProperties consumer;
-
-
-  public ConsumerProperties getConsumerProperties()
-  {
-    return consumer;
-  }
-
-
-  @Validated
-  @Getter
-  @Setter
-  static class ConsumerProperties
-  {
-    @NotNull
-    @NotEmpty
-    private String groupId;
-    @NotNull
-    @NotEmpty
-    private String topic;
-    private OffsetReset autoOffsetReset;
-    private Duration autoCommitInterval;
-
-    enum OffsetReset { latest, earliest, none }
-  }
-}
diff --git a/src/main/resources/application.yml b/src/main/resources/application.yml
index 7a06731c..f38bc561 100644
--- a/src/main/resources/application.yml
+++ b/src/main/resources/application.yml
@@ -1,11 +1,6 @@
 juplo:
-  bootstrap-server: :9092
-  client-id: DEV
   consumer:
-    group-id: my-group
     topic: test
-    auto-offset-reset: earliest
-    auto-commit-interval: 5s
 management:
   endpoint:
     shutdown:
@@ -28,6 +23,12 @@ info:
       topic: ${juplo.consumer.topic}
       auto-offset-reset: ${juplo.consumer.auto-offset-reset}
       auto-commit-interval: ${juplo.consumer.auto-commit-interval}
+spring:
+  kafka:
+    bootstrap-servers: :9092
+    client-id: DEV
+    consumer:
+      group-id: my-group
 logging:
   level:
     root: INFO