Isotope Mail Client
Introduction Isotope mail client is a free open source webmail application built with a microservice architecture vision in mind. As of now, the application is just an MVP offering the basic functionalities of any standard webmail client. The main purpose of this application is to personally expose, explore and learn new technologies, and development and design patterns. However, the application should be fully functional and solve many of the problems that other mail clients face. Features No database required Quick and easy deployment (docker images and deployment examples available) Rich text message editing Support for embedded images (paste into editor) Drag […]

Isotope Mail Client: Introduction and features


react webpack babel sass mn 1
Introduction In this tutorial we’ll see how to build from scratch a React application with Webpack, Babel and Sass. The main requirement for this tutorial is to have a node installation with npm for your platform/OS. The tutorial is structured in several parts: Create an initial project directory Webpack setup Babel setup React Add support for Sass styles Initial project The first step is to create an initial empty project. For that purpose will create an empty directory for the project and run the following command: [crayon-5bf352cb11314358610661/] This command will set up a new package.json file containing metadata for an […]

React : Babel + Webpack + Sass boilerplate application


Test Pyramid
Introduction In this post we’ll see how to use MockMvc to test Spring endpoints. This is the first post of a series, this post will highlight the advantages of using Spring MVC test framework compared to other ways of testing controller classes and what are the different ways to setup your tests. You can find the source code for this post at GitHub. The project contains a regular MVC controller that forwards requests to a static resource, and two rest controllers that return a list of languages and coffees. MockMvc and the test pyramid In his book, Succeeding with Agile: […]

MockMvc – Spring MVC testing framework introduction: Testing Spring endpoints



Introduction This is the second post on the series about Spring Bean Scopes. In the previous tutorial we saw that there were issues rising when a Prototype scoped Bean was injected in a Singleton scoped Bean. The main problem is that autowired Prototypes will be injected when the Singleton Bean is instantiated (which happens only once) thus even though they are prototypes in reality they’ll behave as singletons. The next code highlights this behavior: [crayon-5bf352cb12435068251347/] In the previous example, although the object requested with getAutowiredSample is defined with a Prototype scoped Bean, the instance of the object returned in both […]

Spring Bean Scopes: Singleton with Prototypes


Introduction This tutorial shows the different scopes you can assign to a Bean or a Component in Spring Framework. It’s important to understand that a Bean definition is just a recipe to create instances of a class following the definition of this recipe. This recipe can be then used one or more times during the life cycle of the application to create an instance of the Bean. The Bean scope is one of the main characteristics of the Bean configuration in Spring. The scope will indicate when and how is the object for the Bean definition going to be instantiated. […]

Spring Bean Scopes: Guide to understand the different Bean scopes


Java 10
Introduction As you probably already know, Java 10 was released the past 20th of March following the new tight six-month release schedule. This version comes just after the Java 9 release on September 2017 and marks this past release obsolete. Same will happen to Java 10 on September this year, when the release of Java 11 will mark this one obsolete. Java 11 will be released as a long term support (LTS) version and will have a much longer lifespan, but until then, let’s take a look at some of the new features in Java 10. Time-Based Release Versioning Java […]

Java 10: Testing the new release



Java 8 Streams
Introduction In this post we’ll see how to use Java Streams introduced in Java 8 to obtain a Map from a List. Maps are data structures composed of a collection of key-value elements such that a key is unique within the collection. This allows us to perform searches to find an element with a given key really quickly, without the need to iterate through the full collection. It’s a really common situation that when we have to solve a problem where the start point is a list of elements, we need to convert this list to a map so that […]

Java 8 Streams: Convert List into Map


Spring-Data + MongoDB 2
Introduction Spring Data makes really quick and easy the process of working with data entities, offering a specific implementation for MongoDB. You can merely define queries by creating interfaces with methods following a naming convention or annotating them with @Query and Spring will automagically generate an implementation for you. Most of the times this is enough for simple CRUD and query operations and there is no need to define additional methods. This will allow you to get up and running really quickly avoiding to type boilerplate code. However, there are many times where this is not enough and the repository […]

Spring Data MongoDB: Custom repository implementation


1
Introduction When running a static code analysis tool or inspecting/analyzing your code from your IDE, you may have encountered the following warning regarding your @Autowired fields: Field injection is not recommended This post shows the different types of injections available in Spring and what are the recommended patterns to use each of them. Injection types Although current documentation for spring framework (5.0.3) only defines two major types of injection, in reality there are three; Constructor-based dependency injection Setter-based dependency injection Field-based dependency injection The latter is the one which the static code analysis tool complains about, but is regularly and […]

Field injection is not recommended – Spring IOC



docker as a linux systemd service
Introduction There are many different ways to orchestrate docker container management, initialization, deployment, etc. Even Docker brings its own vanilla tool and mode. There are also many other third party container orchestration tools such as Kubernetes, Rancher, Apache Mesos, etc. Docker daemon offers simple means to start, stop, manage and query status of deployed containers. In this post we’ll cover how to use a docker + systemd only approach to deploy containers as Linux services without the need for third party tools or complex deployment descriptors. In this tutorial we will show how to deploy Portainer as a Linux systemd […]

Docker container as a Linux system service


build.gradle script 6
Introduction In this post I’ll show you how to serve an Angular (>2) frontend application using a Java Spring Boot application as the backend and static page web server, and a Gradle script to perform automated build and deploy tasks both for Spring and Angular. Requirements The technology stack required for this tutorial is: Node.js Angular CLI Gradle The main goal is to achieve a npm install + build that integrates with Java’s gradle build and deploys the distribution files into Spring’s static resources directory. You could replace Angular CLI for any other Frontend build tool / framework such as React. […]

Angular + Spring Boot integration using Gradle


Spring + EclipseLink JPA 3
Spring Data JPA By default Spring uses Hibernate as the default JPA vendor. Although Hibernate is a good choice, some of us may prefer to use EclipseLink as it was supposed to be the reference implementation for the Java Persistence JSR. In this tutorial we will setup a Spring-Boot application to use EclipseLink with a PostgreSQL database, although it can be used with any other database. Fixing dependencies In order to use EclipseLink, we must remove Hibernate’s entity manager from the classpath in order to avoid problems. This is a matter of adding an exclusion to your application’s Gradle script or […]

Spring Data JPA + EclipseLink: Configuring Spring-Boot to use EclipseLink ...