Failed to load ApplicationContext...

Last Update: 13.03.2018. By Jens in Developers Life | Learning | Newsletter

That’s the most common error when starting with Spring. Most of the time, it is an error made by us and Spring complains rightly. Sometimes, however, it is not one simple, stupid error caused by us. Reader Mark did have one of those rare exceptions last week.


Which idiot did write that code?

Last Update: 12.03.2018. By Jens in Developers Life | Learning | Newsletter

Did you ever come across a piece of code and you though “wtf??? which idiot did write that junk?”.


Receiving a Paddle WebHook in Spring Boot

Last Update: 02.03.2018. By Jens in Spring Boot | Spring MVC | Newsletter

In this short tutorial, we’ll cover how to receive a webhook from Paddle in Spring Boot properly.


Let's Build an API Together - Part 33

Last Update: 16.02.2018. By Jens in API Series | APIs | Newsletter

In the last recap session, we take a look at doing validations.


Let's Build an API Together - Part 32

Last Update: 15.02.2018. By Jens in API Series | APIs | Newsletter

One way of handling errors in Spring MVC is by declaring a responsible class using the @ControllerAdvice annotation.


Let's Build an API Together - Part 31

Last Update: 14.02.2018. By Jens in API Series | APIs | Newsletter

Swagger is a tool for documenting APIs, primarily driven from a coding side and a universal docs client.


Let's Build an API Together - Part 30 - CORS

Last Update: 13.02.2018. By Jens in API Series | APIs | Newsletter

When our API is used by anything running in a browser and it this thing running in the browser was not loaded from the same domain our API is running, we will encounter a concept called CORS.


Let's Build an API Together - Part 29 - kanbanbackend.com

Last Update: 12.02.2018. By Jens in API Series | APIs | Newsletter

I’ve been working on the Kanban tutorial app to make it a better tutorial application. This week, I am going to talk about changes and why and how I implemented them.


Making Requests using Spring's RestTemplate

Last Update: 09.02.2018. By Jens in Newsletter | Spring Boot | Spring MVC

The RestTemplate is a little helper class that makes calling web requests an easier. Instead of wrangling with protocols and transformation by ourselves, we get that out of the box by Spring MVC.


Commandline Applications with Spring Boot

Last Update: 08.02.2018. By Jens in Newsletter | Spring Boot

Spring Boot is not only for server applications. Did you know you can write command line apps too?