Baeldung Pro comes with both absolutely No-Ads as well as finally with Dark Mode, for a clean learning experience:
Once the early-adopter seats are all used, the price will go up and stay at $33/year.
Azure Container Apps is a fully managed serverless container service that enables you to build and deploy modern, cloud-native Java applications and microservices at scale. It offers a simplified developer experience while providing the flexibility and portability of containers.
Of course, Azure Container Apps has really solid support for our ecosystem, from a number of build options, managed Java components, native metrics, dynamic logger, and quite a bit more.
To learn more about Java features on Azure Container Apps, visit the documentation page.
You can also ask questions and leave feedback on the Azure Container Apps GitHub page.
Azure Container Apps is a fully managed serverless container service that enables you to build and deploy modern, cloud-native Java applications and microservices at scale. It offers a simplified developer experience while providing the flexibility and portability of containers.
Of course, Azure Container Apps has really solid support for our ecosystem, from a number of build options, managed Java components, native metrics, dynamic logger, and quite a bit more.
To learn more about Java features on Azure Container Apps, you can get started over on the documentation page.
And, you can also ask questions and leave feedback on the Azure Container Apps GitHub page.
Modern software architecture is often broken. Slow delivery leads to missed opportunities, innovation is stalled due to architectural complexities, and engineering resources are exceedingly expensive.
Orkes is the leading workflow orchestration platform built to enable teams to transform the way they develop, connect, and deploy applications, microservices, AI agents, and more.
With Orkes Conductor managed through Orkes Cloud, developers can focus on building mission critical applications without worrying about infrastructure maintenance to meet goals and, simply put, taking new products live faster and reducing total cost of ownership.
Try a 14-Day Free Trial of Orkes Conductor today.
Modern software architecture is often broken. Slow delivery leads to missed opportunities, innovation is stalled due to architectural complexities, and engineering resources are exceedingly expensive.
Orkes is the leading workflow orchestration platform built to enable teams to transform the way they develop, connect, and deploy applications, microservices, AI agents, and more.
With Orkes Conductor managed through Orkes Cloud, developers can focus on building mission critical applications without worrying about infrastructure maintenance to meet goals and, simply put, taking new products live faster and reducing total cost of ownership.
Try a 14-Day Free Trial of Orkes Conductor today.
Mocking is an essential part of unit testing, and the Mockito library makes it easy to write clean and intuitive unit tests for your Java code.
Get started with mocking and improve your application tests using our Mockito guide:
Handling concurrency in an application can be a tricky process with many potential pitfalls. A solid grasp of the fundamentals will go a long way to help minimize these issues.
Get started with understanding multi-threaded applications with our Java Concurrency guide:
Spring 5 added support for reactive programming with the Spring WebFlux module, which has been improved upon ever since. Get started with the Reactor project basics and reactive programming in Spring Boot:
Since its introduction in Java 8, the Stream API has become a staple of Java development. The basic operations like iterating, filtering, mapping sequences of elements are deceptively simple to use.
But these can also be overused and fall into some common pitfalls.
To get a better understanding on how Streams work and how to combine them with other language features, check out our guide to Java Streams:
Explore Spring Boot 3 and Spring 6 in-depth through building a full REST API with the framework:
Yes, Spring Security can be complex, from the more advanced functionality within the Core to the deep OAuth support in the framework.
I built the security material as two full courses - Core and OAuth, to get practical with these more complex scenarios. We explore when and how to use each feature and code through it on the backing project.
You can explore the course here:
All Access is finally out, with all of my Spring courses. Learn JUnit is out as well, and Learn Maven is coming fast. And, of course, quite a bit more affordable. Finally.
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Spring Data JPA is a great way to handle the complexity of JPA with the powerful simplicity of Spring Boot.
Get started with Spring Data JPA through the guided reference course:
End-to-end testing is a very useful method to make sure that your application works as intended. This highlights issues in the overall functionality of the software, that the unit and integration test stages may miss.
Playwright is an easy-to-use, but powerful tool that automates end-to-end testing, and supports all modern browsers and platforms.
When coupled with LambdaTest (an AI-powered cloud-based test execution platform) it can be further scaled to run the Playwright scripts in parallel across 3000+ browser and device combinations:
Yes, we're now running our Spring Sale. All Courses are 25% off until 26th May, 2025:
Yes, we're now running our Spring Sale. All Courses are 25% off until 26th May, 2025:
In the final article, we move on to AWS Messaging Support.
1. AWS Messaging Support
1.1. SQS (Simple Queue Service)
We can send messages to an SQS queue using the QueueMessagingTemplate.
To create this bean, we can use an AmazonSQSAsync client which is available by default in the application context when using Spring Boot starters:
@Bean
public QueueMessagingTemplate queueMessagingTemplate(
AmazonSQSAsync amazonSQSAsync) {
return new QueueMessagingTemplate(amazonSQSAsync);
}Then, we can send the messages using the convertAndSend() method:
@Autowired
QueueMessagingTemplate messagingTemplate;
public void send(String topicName, Object message) {
messagingTemplate.convertAndSend(topicName, message);
}Since Amazon SQS only accepts String payloads, Java objects are automatically serialized to JSON.
We can also configure listeners using @SqsListener:
@SqsListener("spring-cloud-test-queue")
public void receiveMessage(String message,
@Header("SenderId") String senderId) {
// ...
}This method will receive messages from spring-cloud-test-queue and then process them. We can also retrieve message headers using the @Header annotation on method parameters.
If the first parameter is a custom Java object instead of String, Spring will convert the message to that type using JSON conversion.
1.2. SNS (Simple Notification Service)
Similar to SQS, we can use NotificationMessagingTemplate to publish messages to a topic.
To create it, we need an AmazonSNS client:
@Bean
public NotificationMessagingTemplate notificationMessagingTemplate(
AmazonSNS amazonSNS) {
return new NotificationMessagingTemplate(amazonSNS);
}Then, we can send notifications to the topic:
@Autowired
NotificationMessagingTemplate messagingTemplate;
public void send(String Object message, String subject) {
messagingTemplate
.sendNotification("spring-cloud-test-topic", message, subject);
}Out of the multiple SNS endpoints supported by AWS – SQS, HTTP(S), email and SMS, the project only supports HTTP(S).
We can configure the endpoints in an MVC controller:
@Controller
@RequestMapping("/topic-subscriber")
public class SNSEndpointController {
@NotificationSubscriptionMapping
public void confirmUnsubscribeMessage(
NotificationStatus notificationStatus) {
notificationStatus.confirmSubscription();
}
@NotificationMessageMapping
public void receiveNotification(@NotificationMessage String message,
@NotificationSubject String subject) {
// handle message
}
@NotificationUnsubscribeConfirmationMapping
public void confirmSubscriptionMessage(
NotificationStatus notificationStatus) {
notificationStatus.confirmSubscription();
}
}We need to add the topic name to the @RequestMapping annotation on the controller level. This controller enables an HTTP(s) endpoint – /topic-subscriber which be used by an SNS topic to create a subscription.
For example, we can subscribe to a topic by calling the URL:
https://host:port/topic-subscriber/The header in the request determines which of the three methods is invoked.
The method with @NotificationSubscriptionMapping annotation is invoked when the header [x-amz-sns-message-type=SubscriptionConfirmation] is present and confirms a new subscription to a topic.
Once subscribed, the topic will send notifications to the endpoint with the header [x-amz-sns-message-type=Notification]. This will invoke the method annotated with @NotificationMessageMapping.
Finally, when the endpoint unsubscribes from the topic, a confirmation request is received with the header [x-amz-sns-message-type=UnsubscribeConfirmation].
This calls the method annotated with @NotificationUnsubscribeConfirmationMapping which confirms unsubscribe action.
Please note that the value in @RequestMapping has nothing to do with the topic name to which it’s subscribed.
2. Conclusion
In this final article, we explored Spring Cloud’s support for AWS Messaging – which concludes this quick series about Spring Cloud and AWS.
The code backing this article is available on GitHub. Once you're logged in as a Baeldung Pro Member, start learning and coding on the project.
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