GH-1732: Fix Listener Container Parser

Resolves #1372

Do not split `queue-names` in the parser - leave it to Spring's type converter.
Also support SpEL in `queues`; a more elegant solution would require major
refactoring of the parser; so this is just a compromise.

**cherry-pick to 2.3.x, 2.2.x**

spring-rabbit/src/main/java/org/springframework/amqp/rabbit/config/ListenerContainerParser.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -179,21 +179,21 @@ private void parseListener(Element listenerEle, Element containerEle, ParserCont
 
 		String queueNames = listenerEle.getAttribute(QUEUE_NAMES_ATTRIBUTE);
 		if (StringUtils.hasText(queueNames)) {
-			String[] names = StringUtils.commaDelimitedListToStringArray(queueNames);
-			List<TypedStringValue> values = new ManagedList<TypedStringValue>();
-			for (int i = 0; i < names.length; i++) {
-				values.add(new TypedStringValue(names[i].trim()));
-			}
-			containerDef.getPropertyValues().add("queueNames", values);
+			containerDef.getPropertyValues().add("queueNames", queueNames);
 		}
 		String queues = listenerEle.getAttribute(QUEUES_ATTRIBUTE);
 		if (StringUtils.hasText(queues)) {
-			String[] names = StringUtils.commaDelimitedListToStringArray(queues);
-			List<RuntimeBeanReference> values = new ManagedList<RuntimeBeanReference>();
-			for (int i = 0; i < names.length; i++) {
-				values.add(new RuntimeBeanReference(names[i].trim()));
+			if (queues.startsWith("#{")) {
+				containerDef.getPropertyValues().add("queues", queues);
+			}
+			else {
+				String[] names = StringUtils.commaDelimitedListToStringArray(queues);
+				List<RuntimeBeanReference> values = new ManagedList<RuntimeBeanReference>();
+				for (int i = 0; i < names.length; i++) {
+					values.add(new RuntimeBeanReference(names[i].trim()));
+				}
+				containerDef.getPropertyValues().add("queues", values);
 			}
-			containerDef.getPropertyValues().add("queues", values);
 		}
 
 		ManagedMap<String, TypedStringValue> args = new ManagedMap<String, TypedStringValue>();

spring-rabbit/src/test/java/org/springframework/amqp/rabbit/config/ListenerContainerPlaceholderParserTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2019 the original author or authors.
+ * Copyright 2010-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -82,4 +82,21 @@ public void testParseWithQueueNames() throws Exception {
 		assertThat(Arrays.asList(container.getQueueNames()).toString()).isEqualTo("[foo, " + queue.getName() + "]");
 	}
 
+	@Test
+	public void commasInPropertyNames() {
+		SimpleMessageListenerContainer container = this.context.getBean("commaProps1",
+				SimpleMessageListenerContainer.class);
+		assertThat(container.getQueueNames()).containsExactly("foo", "bar");
+	}
+
+	@Test
+	public void commasInPropertyQueues() {
+		SimpleMessageListenerContainer container = this.context.getBean("commaProps2",
+				SimpleMessageListenerContainer.class);
+		String[] queueNames = container.getQueueNames();
+		assertThat(queueNames).hasSize(2);
+		assertThat(queueNames[0]).isEqualTo("foo");
+		assertThat(queueNames[1]).startsWith("spring.gen");
+	}
+
 }

spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/annotation/rabbit-listener.properties

@@ -4,3 +4,5 @@ rabbit.listener.queue=queue1
 rabbit.listener.priority=34
 rabbit.listener.responseRoutingKey=routing-123
 rabbit.listener.admin=rabbitAdmin
+
+foo.and.bar=foo, bar

spring-rabbit/src/test/resources/org/springframework/amqp/rabbit/config/ListenerContainerPlaceholderParserTests-context.xml

@@ -11,6 +11,7 @@
 				<prop key="five">5</prop>
 				<prop key="one">1</prop>
 				<prop key="false">false</prop>
+				<prop key="foo.and.bar">foo, bar</prop>
 			</props>
 		</property>
 	</bean>
@@ -28,4 +29,13 @@
 
 	<bean id="testBean" class="org.springframework.amqp.rabbit.config.ListenerContainerParserTests$TestBean"/>
 
+	<rabbit:listener-container connection-factory="connectionFactory" auto-startup="false">
+		<rabbit:listener id="commaProps1" queue-names="${foo.and.bar}" ref="testBean" method="handle"/>
+	</rabbit:listener-container>
+
+	<rabbit:listener-container connection-factory="connectionFactory" auto-startup="false">
+		<rabbit:listener id="commaProps2" queues="#{T(java.util.Arrays).asList(@foo, @bar).toArray()}"
+				ref="testBean" method="handle"/>
+	</rabbit:listener-container>
+
 </beans>