RSocket Using Spring Boot
1. Overview RSocket is an application protocol providing Reactive Streams semantics – it functions, for example, as an alternative to HTTP. In this tutorial, we’re going to look at RSocket using Spring...
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Intro to OData with Olingo
1. Introduction This tutorial is a follow-up to our OData Protocol Guide, where we’ve explored the basics of the OData protocol. Now, we’ll see how to implement a simple OData service using the Apache...
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A First Experience Working with an AI Assistant in Java
I started using Codota recently, and have been highly impressed with what the tool can do. Simply put, the goal of Codota is to make development simpler, and most importantly – a lot faster. Working...
View ArticleJava Weekly, Issue 282
Here we go… 1. Spring and Java >> Reactive Transactions with Spring [spring.io] A couple of milestone releases that let you play with Spring Reactive’s transactional support, using either RDBC2...
View ArticleUnderstanding NumberFormatException in Java
1. Introduction Java throws NumberFormatException – an unchecked exception – when it cannot convert a String to a number type. Since it’s unchecked, Java does not force us to handle or declare it. In...
View ArticleComposite Primary Keys in JPA
1. Introduction In this tutorial, we’ll learn about Composite Primary Keys and the corresponding annotations in JPA. 2. Composite Primary Keys A composite primary key – also called a composite key – is...
View ArticleExplore Jersey Request Parameters
1. Introduction Jersey is a popular Java framework for creating RESTful web services. In this tutorial, we’ll explore how to read different request parameter types via a simple Jersey project. 2....
View ArticleDouble Dispatch in DDD
1. Overview Double dispatch is a technical term to describe the process of choosing the method to invoke based both on receiver and argument types. A lot of developers often confuse double dispatch...
View ArticleJava Weekly, Issue 283
Here we go… 1. Spring and Java >> Feature toggles in a microservice environment – Part 2: Implementation [blog.codecentric.de] A quick look at Unleash, a Node.js service for managing feature...
View ArticleEnabling Transaction Locks in Spring Data JPA
1. Overview In this quick tutorial, we’ll discuss enabling transaction locks in Spring Data JPA for custom query methods and predefined repository CRUD methods. We will also have a look at different...
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Refactoring in Eclipse
1. Overview On refactoring.com, we read that “refactoring is a disciplined technique for restructuring an existing body of code, altering its internal structure without changing its external behavior.”...
View ArticleGeospatial Support in MongoDB
1. Overview In this tutorial, we’ll explore the Geospatial support in MongoDB. We’ll discuss how to store geospatial data, geo indexing, and geospatial search. We’ll also use multiple geospatial search...
View ArticleWill an Error Be Caught by Catch Block in Java?
1. Overview In this short article, we’re going to show how to properly catch Java errors, and we’ll explain when it doesn’t make sense to do so. For detailed information about Throwables in Java,...
View ArticleGuide to ApplicationContextRunner in Spring Boot
1. Overview It’s well known that auto-configuration is one of the key features in Spring Boot, but testing auto-configuration scenarios can be tricky. In the following sections, we’ll show how...
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Introduction to Docker Compose
1. Overview When using Docker extensively, the management of several different containers quickly becomes cumbersome. Docker Compose is a tool that helps us overcome this problem and easily handle...
View ArticleJava 8 Collectors toMap
1. Introduction In this tutorial, we’re going to talk about the toMap() method of the Collectors class. We use it to collect Streams into a Map instance. For all the examples covered in here, we’ll use...
View ArticleUsing SpringJUnit4ClassRunner with Parameterized
1. Overview In this article, we’ll see how to parameterize a Spring integration test implemented in JUnit4 with a Parameterized JUnit test runner. 2. SpringJUnit4ClassRunner SpringJUnit4ClassRunner is...
View ArticleIntroduction 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...
View ArticleA Guide to Crawler4j
1. Introduction We see web crawlers in use every time we use our favorite search engine. They’re also commonly used to scrape and analyze data from websites. In this tutorial, we’re going to learn how...
View ArticleJava Weekly, Issue 284
Here we go… 1. Spring and Java >> Introducing Spring Cloud App Broker [spring.io] With this Spring Cloud Services 3.0 release, it’s even easier to develop your own service broker with less...
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