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Guide to Resilience4j
1. Overview In this tutorial, we’ll talk about the Resilience4j library. The library helps with implementing resilient systems by managing fault tolerance for remote communications. The library is...
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How to Set a Header on a Response with Spring 5
1. Overview In this quick tutorial, we’ll go through different ways of setting a header on a service response, either for non-reactive endpoints or for APIs using Spring’s 5 WebFlux framework. We can...
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Create a Symbolic Link with Java
1. Overview In this tutorial, we’ll explore different ways of creating a symbolic link in Java using the NIO.2 API, and explore the differences between hard and soft file links. 2. Hard vs...
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Building a Microservice with Apache Meecrowave
1. Overview In this tutorial, we’ll explore the basic functionality of the Apache Meecrowave framework. Meecrowave is a lightweight microservices framework from Apache, which works very well with CDI,...
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An Introduction to the Theory of Big-O Notation
1. Introduction In this article, we’ll give an introduction to the mathematics of big-O notation, as well as show an example of a big-O proof. 2. Formal Definition Definition: f(x) = O(g(x)) means...
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Java Global Exception Handler
1. Overview In this tutorial, we’ll focus on the Global Exception Handler in Java. We’ll first discuss the basics of the exceptions and the exception handling. Then we’ll have a comprehensive look on...
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Image to Base64 String Conversion
1. Overview In this quick tutorial, we’re going to cover how to encode image file to a Base64 String, then decode it to retrieve the original image using Apache Common IO and Java 8 native Base64...
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Context and Servlet Initialization Parameters
1. Overview Servlets are plain Java classes that run in a servlet container. HTTP servlets (a specific type of servlet) are first class citizens in Java web applications. The API of HTTP servlets is...
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Create a Java and Kotlin Project with Maven
1. Introduction In this quick tutorial, we’ll see how to set up a Maven project handling both Java and Kotlin sources. We’ll first create a project for Java sources only. We’ll then add the...
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Guide to java.util.GregorianCalendar
1. Introduction In this tutorial, we’re going to take a quick peek at the GregorianCalendar class. 2. GregorianCalendar GregorianCalendar is a concrete implementation of the abstract class...
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Stack Memory and Heap Space in Java
1. Introduction To run an application in an optimal way, JVM divides memory into stack and heap memory. Whenever we declare new variables and objects, call new method, declare a String or perform...
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RxJava One Observable, Multiple Subscribers
1. Overview The default behavior of multiple subscribers isn’t always desirable. In this article, we’ll cover how to change this behavior and handle multiple subscribers in a proper way. But first,...
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Java Weekly, Issue 237
Here we go… 1. Spring and Java >> A beginner’s guide to the Hibernate JPQL and Native Query Plan Cache [vladmihalcea.com] A solid introduction to the performance gains to be had through proper...
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Add Hours To a Date In Java
1. Overview Before Java 8, java.util.Date was one of the most commonly used classes for representing date-time values in Java. Then Java 8 introduced java.time.LocalDateTime and...
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Increment Date in Java
1. Overview In this tutorial, we’ll look at ways to increment date by one day using Java. Before Java 8, the standard Java date and time libraries weren’t very user-friendly. Hence, Joda-Time became...
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@Component vs @Repository and @Service in Spring
1. Introduction In this quick tutorial, we’re going to learn about the differences between @Component, @Repository, @Service annotations, in the Spring Framework. 2. Spring Annotations In most typical...
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Guide to Spring 5 WebFlux
1. Overview Spring WebFlux framework is part of Spring 5 and provides reactive programming support for web applications. In this tutorial, we’ll be creating a small reactive REST application using the...
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Spring Security Login Page with React
1. Overview React is a component-based JavaScript library built by Facebook. With React, we can build complex web applications with ease. In this article, we’re going to make Spring Security work...
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Handling Errors in Spring WebFlux
1. Overview In this tutorial, we’ll look at various strategies available for handling errors in a Spring WebFlux project while walking through a practical example. We’ll also point out where it might...
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Container Configuration in Spring Boot 2
1. Overview In this quick tutorial, we’ll have a look at how to replace the EmbeddedServletContainerCustomizer and ConfigurableEmbeddedServletContainer in Spring Boot 2. These classes were part of...
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