Using API Gateways is a common design pattern with microservice architectures. API Gateways allow you to abstract the underlying implementation of the microservices. Microservices based systems typically have a large number of independent services. One challenge in such systems is how external clients interact with the services. If external clients interact directly with each microservices, […]Continue reading
A Spring Boot RESTful service is typically divided into three layers: Repository, Service, and Controller. This layering helps to segregate the RESTful application responsibilities and enabling loose coupling between the objects. When you develop a layered RESTful application, you will also need to test the different layers. In this post, I will discuss testing Spring […]Continue reading
In my previous post Caching in Spring RESTful Service: Part 1, I discussed how to implement caching for queries on products. Now, consider a scenario where you need to delete or update a product. The cache should be aware of these operations. Or else, the cache will return old product information. To address such problems, […]Continue reading
RabbitMQ is a common messaging broker which allows applications to connect and communicate. It’s common for services in microservices-based systems to communicate asynchronously through messaging. In order to create such a message-based system, you need a message broker, aka messaging server. A message broker can support several messaging patterns. Typically, a message sender sends a […]Continue reading
Why Use Caching? When data stored in some database is requested simultaneously from a large user base, the system can get overwhelmed. This happens because for each request the application has to retrieve the data from the database. As the number of simultaneous requests keeps on increasing, the performance of the system degrades increasing latency. […]Continue reading
Introduction In this article, we will look at Spring Framework’s support of immutable property binding. We described Spring external configuration in this article and also provided a more detailed article about the Java bean properties binding. In this article, we will demonstrate constructor binding using the merchant account configuration in this article. Constructor binding enables […]Continue reading
Introduction In this article, we explained why we should externalise our application configuration data. We also provided configuration examples that use various methods supported by Spring Boot. Within these methods was the Java bean properties binding but it was less detailed. Therefore in this article, we are going to give more details about using the […]Continue reading
Introduction Situation Most of our applications are supported by external services such as a database server, an SMS gateway, or services such as PayPal. Such services can exist in more than one environment i.e development and production environments. If we want to connect to the production environment we must pass through the development environment first. […]Continue reading
If you need to quickly create a JPA-based repository layer, Spring Data JPA is the right choice. You define your repository interface by extending one of the Spring Data JPA Repository interfaces. At runtime, Spring Data JPA will create your repository implementations with the common CRUD methods. You can then perform CRUD operations without writing […]Continue reading
Modern Enterprise application development using the Spring framework makes use of containerization technology, such as Docker to ship and run applications. Building an application, packaging it, then building the image, and pushing images to an image registry is cumbersome if done manually. In addition, each time you make any changes to the codebase, you need […]Continue reading
