Fix deserializing lists with @SnsNotificationMessage (#1282)

Fixes #1280

Author: frjonsen

spring-cloud-aws-sqs/src/main/java/io/awspring/cloud/sqs/support/converter/SnsMessageConverter.java

@@ -72,7 +72,10 @@ private Object fromGenericMessages(List<GenericMessage<?>> messages, Class<?> ta
 		Type resolvedType = getResolvedType(targetClass, conversionHint);
 		Class<?> resolvedClazz = ResolvableType.forType(resolvedType).resolve();
 
-		return messages.stream().map(message -> fromGenericMessage(message, resolvedClazz, resolvedType)).toList();
+		Object hint = targetClass.isAssignableFrom(List.class) &&
+			conversionHint instanceof MethodParameter mp ? mp.nested() : conversionHint;
+
+		return messages.stream().map(message -> fromGenericMessage(message, resolvedClazz, hint)).toList();
 	}
 
 	private Object fromGenericMessage(GenericMessage<?> message, Class<?> targetClass,

spring-cloud-aws-sqs/src/test/java/io/awspring/cloud/sqs/integration/SqsMessageConversionIntegrationTests.java

@@ -275,7 +275,7 @@ static class ResolvesPojoWithNotificationAnnotationListener {
 
 		@SqsListener(queueNames = RESOLVES_POJO_FROM_NOTIFICATION_MESSAGE_QUEUE_NAME, id = "resolves-pojo-with-notification-message", factory = "defaultSqsListenerContainerFactory")
 		void listen(@SnsNotificationMessage MyEnvelope<MyPojo> myPojo) {
-			Assert.notNull((myPojo).data.firstField, "Received null message");
+			assertThat(myPojo.getData().getFirstField()).isEqualTo("pojoNotificationMessage");
 			logger.debug("Received message {} from queue {}", myPojo,
 					RESOLVES_POJO_FROM_NOTIFICATION_MESSAGE_QUEUE_NAME);
 			latchContainer.resolvesPojoNotificationMessageLatch.countDown();
@@ -286,6 +286,10 @@ void listen(@SnsNotificationMessage List<MyEnvelope<MyPojo>> myPojos) {
 			Assert.notEmpty(myPojos, "Received empty messages");
 			logger.debug("Received messages {} from queue {}", myPojos,
 					RESOLVES_POJO_FROM_NOTIFICATION_MESSAGE_LIST_QUEUE_NAME);
+
+			for (MyEnvelope<MyPojo> myPojo : myPojos) {
+				assertThat(myPojo.getData().getFirstField()).isEqualTo("pojoNotificationMessage");
+			}
 			latchContainer.resolvesPojoNotificationMessageListLatch.countDown();
 		}
 	}