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
Java 14 introduces a new feature called Records. In Java, Record is a special type of Java class. It is intended to hold pure immutable data in it. The syntax of a record is concise and short as compared to a normal class In this post, I will explain why do we need Java records and […]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
In Java 8 lambda expressions were added to make Java code more concise and readable. Lambda expressions are similar to methods. However, unlike other methods, lambda expressions do not need a name. You can implement a lambda expression right in the body of a method. If you are new to lambda expressions I suggest you […]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
Spring Boot REST APIs have different types of clients accessing from different locations. At times, these APIs need to perform tasks to generate and share sensitive data. Now all clients should not get access to such data, but only a privileged set of clients should. In such scenarios, you need to secure your REST API. […]Continue reading
Java SE 12 introduces switch expressions, which like all expressions evaluate to a single value, that you can use as statements. Java 12, brings improvement to the switch statement with new capabilities. Some of the key capabilities are arrow case labels, multiple case statements, and return values. In this post, I’ll explain the new switch […]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
