Queues vs. Topics vs. Virtual Topics (in ActiveMQ) ActiveMQ provides a variety of different messaging patterns. While queues and topics are the most famous ones, virtual topics can combine the best of both worlds: multiple consumers with their own dedicated queue. Queues Queues are the most obvious messaging pattern implemented by ActiveMQ. They provide a direct channel between a producer and a consumer. […]
Login by captcha and authenticate with JSON Web Token We use a login to secure our application and restrict its access to a certain group of users. But what if everybody should be allowed to use our application if he can prove he’s human? Well, we would use a captcha. The following example shows how we can use Google’s ReCaptcha for an anonymous login […]
Using @ConfigurationProperties to separate service and configuration Roughly about two years ago, I wrote an article called “Why using Spring’s @Value annotation is bad“. I described why you should avoid @Value annotations all throughout your code. By using @Value annotations in services, controllers and other Spring components, you will scatter your configuration through the complete application. In the worst case, you will […]
The Disqus Affiliated Links Program Yesterday, I received an e-mail from somebody who read an article on my blog. He told me that he clicked on the XING link on my “About” page, but was redirected to some shady online trading website instead of my XING profile. So I took my laptop and reviewed my own blog, immediately. And – […]
AngularJS tests with mocked HTML documents Most of the time, testing AngularJS applications means testing JavaScript. We test services and we test controllers. But what about directives? What about components? How do we test compiled and injected AngularJS code? Plunker But before we start, here’s the running Plunker with the complete example: https://plnkr.co/edit/PKn4tpUDFWyeqJ2Tb7Ba Testing directives/components Around a year ago I wrote […]
Coursera Full Stack Web Development Capstone Project A couple of days ago I finished my capstone project for the Full Stack Web Development specialization on Coursera. It marks the end of the 6-course specialization about Bootstrap CSS, AngularJS and NodeJS. The Assignment The assignment itself is simple: Build a web application with the tools taught in the course (Bootstrap CSS, AngularJS, NodeJS, […]
Coursera Full Stack Web Development Course Review During the last 6 months I did the Full Stack Web Development course on Coursera. Since I’m currently about to finish the course by implementing my final capstone project (https://github.com/tuhrig/mebo), I wanted to share my thoughts about the course and its pros and cons. About the course The Full Stack Web Development course consists of […]
Java vs. JavaScript Build Tools When you come from a Java background like I do and you take a look at JavaScript build tools, the sheer mass of tools is overwhelming.The eco system is evolving very fast with new tools coming up every couple of months. Below, I tried to give a comparison between Java build tools and their equivalent […]
Don’t use transitive dependencies in AngularJS modules Whenever you write an AngularJS application, you will use modules. Modules divide you application into small logical pieces. Some pieces might depended on other, some might be totally independent. 123456 angular.module('UserModule',[]); // no dependency!angular.module('UtilModule',[]); // no dependency!angular.module('MainModule',[ // 2 dependencies! 'UserModule', 'UtilModule']); In the example above, you see three modules. A module called MainModule depending on two other modules, called UserModule and UtilModule. Note that this is […]
AngularJS provider and app configuration AngularJS provides 3 different ways to create a service: Factory A factory is a well known pattern in software development. It aims to create a certain object, in this case a service. In AngularJS this is simply a function which returns an object with methods. In my opinion, this is the cleanest way to create […]
