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Introduction to Quasar in Kotlin 1. Introduction Quasar is a Kotlin library that brings some asynchronous concepts to Kotlin in an easier to manage way. This includes lightweight threads, Channels, Actors, and more. 2. Setting Up the Build To use the most recent version of Quasar, you need to run… Continue Reading kotlin-quasar
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Log4j 2 and Lambda Expressions 1. Overview The Log4j 2 library has added support for Java 8 lambda expressions since version 2.4. These expressions can be used by the Logger interface to enable lazy logging. Let’s see a quick example of how we can make use of this feature. For… Continue Reading log4j-2-lazy-logging
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Front-End App with Spring Security OAuth – Authorization Code Flow 1. Overview In this tutorial, we’ll continue our Spring Security OAuth series by building a simple front end for Authorization Code flow. Keep in mind that the focus here is the client-side; have a look at the Spring REST API + OAuth2… Continue Reading spring-security-oauth-authorization-code-flow
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Introduction to WireMock 1. Overview WireMock is a library for stubbing and mocking web services. It constructs a HTTP server that we could connect to as we would to an actual web service. When a WireMock server is in action, we can set up expectations, call the service, and then… Continue Reading introduction-to-wiremock
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LongAdder and LongAccumulator in Java 1. Overview In this article, we’ll be looking at two constructs from the java.util.concurrent package: LongAdder and LongAccumulator. Both are created to be very efficient in the multi-threaded environment and both leverage very clever tactics to be lock-free and still remain thread-safe. 2. LongAdder Let’s… Continue Reading java-longadder-and-longaccumulator
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Programmatically Creating Sequences with Project Reactor 1. Overview In this tutorial, we’ll use Project Reactor basics to learn a few techniques for creating Fluxes. 2. Maven Dependencies Let’s get started with a couple of dependencies. We’ll need reactor-core and reactor-test: <dependency> <groupId>io.projectreactor</groupId> <artifactId>reactor-core</artifactId> <version>3.2.6.RELEASE</version> </dependency> <dependency> <groupId>io.projectreactor</groupId> <artifactId>reactor-test</artifactId> <version>3.2.6.RELEASE</version> <scope>test</scope> </dependency> 3.… Continue Reading flux-sequences-reactor
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Java 9 Reactive Streams 1. Overview In this article, we’ll be looking at the Java 9 Reactive Streams. Simply put, we’ll be able to use the Flow class, which encloses the primary building blocks for building reactive stream processing logic. Reactive Streams is a standard for asynchronous stream processing with… Continue Reading java-9-reactive-streams
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Idiomatic Logging in Kotlin 1. Introduction In this tutorial, we’ll take a look at a few logging idioms that fit typical Kotlin programming styles. 2. Logging Idioms Logging is a ubiquitous need in programming. While apparently a simple idea (just print stuff!), there are many ways to do it. In… Continue Reading kotlin-logging
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Introduction to Vavr’s Validation API 1. Overview Validation is a frequently occurring task in Java applications, and hence a lot of effort has been put into the development of validation libraries. Vavr (formerly known as Javaslang) provides a full-fledged validation API. It allows us to validate data in a straightforward… Continue Reading vavr-validation-api
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Display RSS Feed with Spring MVC 1. Introduction This quick tutorial will show how to build a simple RSS feed using Spring MVC and the AbstractRssFeedView class. Afterward, we’ll also implement a simple REST API – to expose our feed over the wire. 2. RSS Feed Before going into the… Continue Reading spring-mvc-rss-feed
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