ArgumentCaptor in Mockito allows you to capture arguments passed to methods for further assertions. You can apply standard JUnit assertion methods, such as assertEquals(), assertThat(), and so on, to perform assertions on the captured arguments. In Mockito, you will find the ArgumentCaptor class in the org. mockito package If you are new to mocking with […]Continue reading
Enterprise Applications developed using the Spring Framework use different types of configuration properties to configure the application at runtime. These configuration properties help in connecting to databases, messaging systems, perform logging, caching, and lots more. It is common to store configuration properties in external .properties and .yml files. There are various ways of reading external […]Continue reading
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
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
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
