Alternative fix for Rabbit listener transactions

Never inject a transaction manager (user can create his own
"rabbitListenerContainerFactory" bean if he wants an actual
non-JTA transaction manager.

See gh-3432

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/amqp/RabbitAnnotationDrivenConfiguration.java

@@ -20,12 +20,10 @@ import org.springframework.amqp.rabbit.annotation.EnableRabbit;
 import org.springframework.amqp.rabbit.config.RabbitListenerConfigUtils;
 import org.springframework.amqp.rabbit.config.SimpleRabbitListenerContainerFactory;
 import org.springframework.amqp.rabbit.connection.ConnectionFactory;
-import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
-import org.springframework.transaction.PlatformTransactionManager;
 
 /**
  * Configuration for Spring AMQP annotation driven endpoints.
@@ -37,19 +35,12 @@ import org.springframework.transaction.PlatformTransactionManager;
 @ConditionalOnClass(EnableRabbit.class)
 class RabbitAnnotationDrivenConfiguration {
 
-	@Autowired(required = false)
-	private PlatformTransactionManager transactionManager;
-
 	@Bean
 	@ConditionalOnMissingBean(name = "rabbitListenerContainerFactory")
 	public SimpleRabbitListenerContainerFactory rabbitListenerContainerFactory(
 			ConnectionFactory connectionFactory, RabbitProperties config) {
 		SimpleRabbitListenerContainerFactory factory = new SimpleRabbitListenerContainerFactory();
 		factory.setConnectionFactory(connectionFactory);
-		if (this.transactionManager != null
-				&& config.getListener().isUseTransactionManager()) {
-			factory.setTransactionManager(this.transactionManager);
-		}
 		return factory;
 	}
 

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/amqp/RabbitProperties.java

@@ -62,12 +62,6 @@ public class RabbitProperties {
 	 */
 	private String addresses;
 
-	private Listener listener = new Listener();
-
-	public Listener getListener() {
-		return this.listener;
-	}
-
 	public String getHost() {
 		if (this.addresses == null) {
 			return this.host;
@@ -162,16 +156,4 @@ public class RabbitProperties {
 		this.virtualHost = ("".equals(virtualHost) ? "/" : virtualHost);
 	}
 
-	public static class Listener {
-		private boolean useTransactionManager = false;
-
-		public boolean isUseTransactionManager() {
-			return this.useTransactionManager;
-		}
-
-		public void setUseTransactionManager(boolean useTransactionManager) {
-			this.useTransactionManager = useTransactionManager;
-		}
-	}
-
 }