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Testing Callbacks with Mockito 1. Overview In this short tutorial, we’ll focus on how to test Callbacks using the popular testing framework Mockito. We’ll explore two solutions, firstly using an ArgumentCaptor and then the intuitive doAnswer() method. To learn more about testing well with Mockito, check out our Mockito series here.… Continue Reading mockito-callbacks
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Java 9 New Features 1. Overview Java 9 comes with a rich feature set. Although there are no new language concepts, new APIs and diagnostic commands will definitely be interesting to developers. In this writeup we’re going to have quick, high level look at some of the new features; a… Continue Reading new-java-9
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Spring Boot CRUD Application with Thymeleaf 1. Overview The implementation of DAO layers that provide CRUD functionality on JPA entities can be a repetitive, time-consuming task that we want to avoid in most cases. Luckily, Spring Boot makes it easy to create CRUD applications through a layer of standard JPA-based CRUD… Continue Reading spring-boot-crud-thymeleaf
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Spring Session with MongoDB 1. Overview In this quick tutorial, we’ll be exploring how to use the Spring Session backed with MongoDB, both with and without Spring Boot. Spring Session can also be backed with other stores such as Redis and JDBC. 2. Spring Boot Configuration First, let’s look at… Continue Reading spring-session-mongodb
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CDI Interceptor vs Spring AspectJ 1. Introduction The Interceptor pattern is generally used to add new, cross-cutting functionality or logic in an application, and has solid support in a large number of libraries. In this article we’ll cover and contrast two of these major libraries: CDI interceptors and Spring AspectJ.… Continue Reading cdi-interceptor-vs-spring-aspectj
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Java Weekly, Issue 206 Here we go… 1. Spring and Java ===== >> Make your life easier with Kotlin stdlib [blog.frankel.ch] Kotlin has some small gems in its standard library. >> Collections.checkedCollection() [javaspecialists.eu] checkedCollection() is an old and forgotten API, which still has some valid use-cases. >> Servlet vs. Reactive:… Continue Reading java-weekly-206
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A Guide to Java Sockets 1. Overview The term socket programming refers to writing programs that execute across multiple computers in which the devices are all connected to each other using a network. There are two communication protocols that one can use for socket programming: User Datagram Protocol (UDP) and… Continue Reading a-guide-to-java-sockets
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Create a Custom Auto-Configuration with Spring Boot 1. Overview Simply put, the Spring Boot autoconfiguration represents a way to automatically configure a Spring application based on the dependencies that are present on the classpath. This can make development faster and easier by eliminating the need for defining certain beans that… Continue Reading spring-boot-custom-auto-configuration
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Configuring Separate Spring DataSource for Tests 1. Overview When testing a Spring application that relies on a persistence layer, such as JPA, we may want to set up a test data source to use a smaller, faster database – one that is different from the one we use to run… Continue Reading spring-testing-separate-data-source
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Validation for Functional Endpoints in Spring 5 1. Overview It’s often useful to implement input validation for our APIs to avoid unexpected errors later when we’re processing the data. Unfortunately, in Spring 5 there’s no way to run validations automatically on functional endpoints as we do on annotated-based ones. We have… Continue Reading spring-functional-endpoints-validation
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