👋 Hey there,I'm Dimitri

I like trying out new frameworks and writing about them. Below you can find the latest articles I wrote.


Validating the input of your REST API with Spring

June 8th, 2018 | 9 min read | Spring, Spring boot, validators

When handling input of a user, validation is a common task. In fact, it’s so common, that there’s even a specification for it called JSR 303 bean validation and JSR-380 which contains version 2 of the same specification. With Spring, we can utilize this specification to the fullest extent, and make validation an easier task.

Indexing documents with Spring batch

June 5th, 2018 | 9 min read | Solr, spring batch, Spring boot

Batch processing of information is a common thing to do when developing applications. Spring has its own framework to handle batch processing, called Spring batch. In this tutorial, I’ll use Spring batch to index markdown documents on my local disk onto Solr to make them easier to search for.

Setting up Apache Solr with Tika using Docker

May 22nd, 2018 | 7 min read | Docker, Solr, Tika

When indexing documents, Apache Solr is a possible solution. Combined with Apache Tika, you can also use Solr to index various types of documents, such as PDFs, Word documents, HTML files, … . In this tutorial, I’ll be setting up Solr with Tika using Docker compose.

Writing GraphQL mutations with Spring boot

May 8th, 2018 | 9 min read | GraphQL, Java, Spring boot

A few weeks ago, we created a beautiful API using GraphQL. We only had one problem… the application was completely read-only and no updates were allowed. This time, we’re about to change this, and implement our own mutations with GraphQL.

Using Apollo GraphQL with Angular

April 24th, 2018 | 6 min read | angular, apollo, GraphQL

Last time, we wrote a GraphQL API using Spring boot and the graphql-java library. Today, we’ll write a simple frontend application using Angular. As mentioned in my previous article, there are few JavaScript libraries out there that we can use. Facebook, which is also behind the idea of GraphQL, wrote a library called Relay. Additionally, […]

Working with Spring boot and GraphQL

April 10th, 2018 | 11 min read | GraphQL, Spring boot

When creating applications, REST is an often used technology to transfer data through APIs. While REST is commonly adopted, there are some issues with it. In this tutorial, I’ll show you how GraphQL compares to REST and how to use GraphQL with Spring boot.

Working with @ngrx/store

March 13th, 2018 | 11 min read | angular, ngrx, rxjs

One of the major differences between AngularJS 1.x and Angular 2 and beyond is the shift to components. Even though components were introduced in AngularJS 1.5, controllers are still often used. Embracing components provides many advantages, such as proper loosely coupled components, re-usability and so on. One drawback to the component-based approach is state management […]

Writing your own Spring boot starter

February 27th, 2018 | 6 min read | Spring boot

If you worked with Spring boot before, you know it, there are various starters out there. These starters automatically configure all kind of things so that you no longer have to. This allows you to get started more quickly, and not to be bothered about configuration that is usually a copy-paste from something else. The […]

Monitoring Spring boot applications with Prometheus and Grafana

February 13th, 2018 | 7 min read | grafana, monitoring, prometheus, Spring boot

This article is outdated since the release of Spring boot 2.0. If you’re interested in a more up-to-date setup, make sure to read my new tutorial about monitoring Spring boot applications with Micrometer, Prometheus and Grafana. Monitoring is an essential aspect to the maintainability of applications, it’s no surprise that there are many platforms out there that […]