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Java 8 Streams peek() API 1. Introduction The Java Stream API introduces us to a powerful alternative for processing data. In this short tutorial, we’ll focus on peek(), an often misunderstood method. 2. Quick Example Let’s get our hands dirty and try to use peek(). We have a stream of… Continue Reading java-streams-peek-api
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Introduction to Awaitlity 1. Introduction A common problem with asynchronous systems is that it’s hard to write readable tests for them that are focused on business logic and are not polluted with synchronizations, timeouts, and concurrency control. In this article, we are going to take a look at Awaitility —… Continue Reading awaitlity-testing
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A Secondary Facebook Login with Spring Social 1. Overview In this tutorial, we’ll focus on adding a new Facebook login to an existing form-login app. We’re going to be using the Spring Social support to interact with Facebook and keep things clean and simple. 2. Maven Configuration First, we will… Continue Reading facebook-authentication-with-spring-security-and-social
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Spring Data MongoDB – Indexes, Annotations and Converters 1. Overview This tutorial will explore some of the core features of Spring Data MongoDB – indexing, common annotations and converters. 2. Indexes ==== 2.1. @Indexed This annotation marks the field as indexed in MongoDB: @QueryEntity @Document public class User { @Indexed… Continue Reading spring-data-mongodb-index-annotations-converter
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Download an Image or a File with Spring MVC Spring MVC 1. Overview Serving static files to the client can be done in a variety of ways, and using a Spring Controller isn’t necessarily the best available option. However, sometimes the controller route is necessary – and that’s what we’re… Continue Reading spring-controller-return-image-file
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Introduction to GeoTools 1. Overview In this article, we’ll go through the basics of the GeoTools open source Java library – for working with geospatial data. This library provides compliant methods for implementing Geographic Information Systems (GIS) and implements and supports many Open Geospatial Consortium (OGC) standards. As the OGC… Continue Reading geo-tools
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REST Query Language with Spring Data JPA and Querydsl 1. Overview In this tutorial, we’re looking at building a query language for a REST API using Spring Data JPA and Querydsl. In the first two articles of this series, we built the same search/filtering functionality using JPA Criteria and Spring… Continue Reading rest-api-search-language-spring-data-querydsl
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Introduction to Jenetics Library 1. Introduction The aim of this series is to explain the idea of genetic algorithms and show the most known implementations. In this tutorial, we’ll describe a very powerful Jenetics Java library that can be used for solving various optimization problems. If you feel that you… Continue Reading jenetics
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Find the Longest Substring without Repeating Characters 1. Overview In this tutorial, compare ways to find the longest substring of unique letters using Java. For example, the longest substring of unique letters in “CODINGISAWESOME” is “NGISAWE”. 2. Brute Force Approach Let’s start with a naive approach. To begin with, we can examine… Continue Reading java-longest-substring-without-repeated-characters
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Creating a Custom Starter with Spring Boot 1. Overview The core Spring Boot developers provide starters for most of the popular open source projects, but we are not limited to these. We can also write our own custom starters. If we have an internal library for use within our organization,… Continue Reading spring-boot-custom-starter
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