Add transactionIdPrefix Property to KafkaTemplate

See gh-29089

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/kafka/KafkaAutoConfiguration.java

@@ -25,6 +25,7 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.boot.autoconfigure.kafka.KafkaProperties.Jaas;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.boot.context.properties.PropertyMapper;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Import;
@@ -66,10 +67,13 @@ public class KafkaAutoConfiguration {
 	public KafkaTemplate<?, ?> kafkaTemplate(ProducerFactory<Object, Object> kafkaProducerFactory,
 			ProducerListener<Object, Object> kafkaProducerListener,
 			ObjectProvider<RecordMessageConverter> messageConverter) {
+
+		PropertyMapper map = PropertyMapper.get().alwaysApplyingWhenNonNull();
 		KafkaTemplate<Object, Object> kafkaTemplate = new KafkaTemplate<>(kafkaProducerFactory);
 		messageConverter.ifUnique(kafkaTemplate::setMessageConverter);
-		kafkaTemplate.setProducerListener(kafkaProducerListener);
-		kafkaTemplate.setDefaultTopic(this.properties.getTemplate().getDefaultTopic());
+		map.from(kafkaProducerListener).to(kafkaTemplate::setProducerListener);
+		map.from(this.properties.getTemplate().getDefaultTopic()).to(kafkaTemplate::setDefaultTopic);
+		map.from(this.properties.getTemplate().getTransactionIdPrefix()).to(kafkaTemplate::setTransactionIdPrefix);
 		return kafkaTemplate;
 	}
 

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/kafka/KafkaProperties.java

@@ -824,6 +824,11 @@ public class KafkaProperties {
 		 */
 		private String defaultTopic;
 
+		/**
+		 * Override the transaction id prefix in the producer factory.
+		 */
+		private String transactionIdPrefix;
+
 		public String getDefaultTopic() {
 			return this.defaultTopic;
 		}
@@ -832,6 +837,14 @@ public class KafkaProperties {
 			this.defaultTopic = defaultTopic;
 		}
 
+		public String getTransactionIdPrefix() {
+			return this.transactionIdPrefix;
+		}
+
+		public void setTransactionIdPrefix(String transactionIdPrefix) {
+			this.transactionIdPrefix = transactionIdPrefix;
+		}
+
 	}
 
 	public static class Listener {

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/kafka/KafkaAutoConfigurationTests.java

@@ -384,6 +384,7 @@ class KafkaAutoConfigurationTests {
 	void listenerProperties() {
 		this.contextRunner
 				.withPropertyValues("spring.kafka.template.default-topic=testTopic",
+						"spring.kafka.template.transaction-id-prefix=txOverride",
 						"spring.kafka.listener.ack-mode=MANUAL", "spring.kafka.listener.client-id=client",
 						"spring.kafka.listener.ack-count=123", "spring.kafka.listener.ack-time=456",
 						"spring.kafka.listener.concurrency=3", "spring.kafka.listener.poll-timeout=2000",
@@ -406,6 +407,7 @@ class KafkaAutoConfigurationTests {
 					assertThat(kafkaTemplate.getMessageConverter()).isInstanceOf(MessagingMessageConverter.class);
 					assertThat(kafkaTemplate).hasFieldOrPropertyWithValue("producerFactory", producerFactory);
 					assertThat(kafkaTemplate.getDefaultTopic()).isEqualTo("testTopic");
+					assertThat(kafkaTemplate).hasFieldOrPropertyWithValue("transactionIdPrefix", "txOverride");
 					assertThat(kafkaListenerContainerFactory.getConsumerFactory()).isEqualTo(consumerFactory);
 					ContainerProperties containerProperties = kafkaListenerContainerFactory.getContainerProperties();
 					assertThat(containerProperties.getAckMode()).isEqualTo(AckMode.MANUAL);