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Changing the Order in a Sum Operation Can Produce Different Results? 1. Overview In this quick article, we’re going to have a look at why changing the sum order returns a different result. 2. Problem When we look at the following code, we can easily predict the correct answer (13.22… Continue Reading java-floating-point-sum-order
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Introduction to Ratpack 1. Overview Ratpack is a set of JVM based libraries built for modern days high-performance real-time applications. It’s built on top of embedded Netty event-driven networking engine and is fully compliant with the reactive design pattern. In this article, we’ll learn how to use Ratpack and we’ll… Continue Reading ratpack
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Method References in Java 1. Overview One of the most welcome changes in Java 8 was the introduction of lambda expressions, as these allow us to forego anonymous classes, greatly reducing boilerplate code and improving readability. Method references are a special type of lambda expressions. They’re often used to create simple… Continue Reading java-method-references
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Could Not Find or Load Main Class Error 1. Introduction Occasionally when we run a Java program, we might see “Could not find or load main class”. It’s easy to guess the reason: The JVM failed to find the main class and gave this error. But why couldn’t it? In… Continue Reading java-could-not-find-load-main-class
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The DAO with JPA and Spring 1. Overview This article will show how to implement the DAO with Spring and JPA. For the core JPA configuration, see the article about JPA with Spring. 2. No More Spring Templates Starting with Spring 3.1, the JpaTemplate and the corresponding JpaDaoSupport have been… Continue Reading spring-dao-jpa
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The Baeldung Weekly Review 23 1. Java and Spring ===== >> Writing Clean Tests – Divide and Conquer “A good unit test should fail for only one reason” – this simple fact is oh so important to adhere to and has a major impact on the quality of your design.… Continue Reading 2014-week-review-23
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Introduction to Spring Reactor 1. Overview In this quick article, we’ll introduce the Spring Reactor project. We’ll set up a real-life scenario for a reactive, event-driven application. 2. The Basics of Spring Reactor ==== 2.1. Why Reactor? The reactive design pattern is an event-based architecture for asynchronous handling of a… Continue Reading spring-reactor
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Simple Jenkins Pipeline with Marathon and Mesos 1. Introduction In this article, we’ll be implementing a simple Continuous Delivery pipeline with Jenkins, Marathon and Mesos. First, we will give a high-level overview of the technology stack and architecture, with an explanation of how everything fits together. Following that, we’ll move… Continue Reading jenkins-pipeline-with-marathon-mesos
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Spring Security OAuth Login with WebFlux 1. Overview Spring Security added OAuth support for WebFlux starting with the 5.1.x GA. We’ll discuss how to configure our WebFlux application to use OAuth2 Login support. We’ll also discuss how to use WebClient to access OAuth2 secured resources. The OAuth Login configuration for… Continue Reading spring-oauth-login-webflux
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Life Cycle of a Thread in Java 1. Introduction In this article, we’ll discuss in detail a core concept in Java – the lifecycle of a thread. We’ll use a quick illustrated diagram and, of course, practical code snippets to better understand these states during the thread execution. To… Continue Reading java-thread-lifecycle
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