This post would look into how to tackle and debug issues in scenarios where they only occur in production (or other remote environment) but not in development environment. As anybody who has been in this kind of situation would acknowledge, trying to pinpoint the cause of these kind of “issues” might quickly end up being […]
Dynamic web forms with AngularJS
When we’re building web applications containing data entry forms, it’s sometimes a requirement that (part of) the form is dynamic, in the sense that the fields to be included in the form need to be determined at runtime. For instance, this may be required if application managers need to be able to add new data […]
Web forms with Java: AngularJS and other approaches
After learning about AngularJS a couple of months ago, I started using it on new Java web projects, and that has been a great pleasure. If you haven’t worked with AngularJS yet, you may be wondering what the hype is all about and whether or not it’s a thing worthwhile of investing your time in. […]
Session Timeout and Concurrent Session Control with Spring Security and Spring-MVC
A web application me and my team are building recently underwent a security review. As usual, because you haven’t yet had time to put any real effort into it, some security risks did surface. We use Spring Security and Spring-MVC and I will talk about implementing a session timeout and concurrent session control: nice subjects […]
Java clients behavior during a split-brain situation in Elasticsearch
In my previous blog post I explained what the split-brain problem is for elasticsearch and how to avoid it, but only briefly spoken about how it manifests. In this post I’m going to expand on what actually happens to your indexing and query requests after the split-brain has occurred. As I’m sure you’re already aware, […]
Using Docker to efficiently create multiple tomcat instances
In my previous blog article I gave a short introduction into Docker (“an open-source engine that automates the deployment of any application as a lightweight, portable, self-sufficient container that will run virtually anywhere”). In this article we’ll check out how to create an image for Tomcat 7 and the Java 7 JDK as dependency. So, let’s […]
Checking return values in Java
The other day I made a stupid coding error. It took me the better part of an hour to track it down. We all have those moments. Blame it on a bad night’s sleep, a brain fart, or perhaps the fact that your colleague at the next desk has been whistling that tune from Gotye’s […]
QCon London 2013 – Simplicity, complexity and doodles
Westminster Abbey – View from the Queen Elizabeth II conference center …and now back home On my desk lies a stack of notepads from the QCon sponsors. I pick up one of them and turn few pages trying to decipher my own handwriting. As I read my notes I reflect back on the conference. QCon […]
Introducing the elasticshell
A few days ago I released the first beta version of the elasticshell, a shell for elasticsearch. The idea I had was to create a command line tool that allows you to easily interact with elasticsearch. Isn’t elasticsearch easy enough already? I really do think elasticsearch is already great and really easy to use. However, […]
Prepare for the Storm and be saved by Puppet!
After a highly successful edition of the GOTO Night in December with Timan Rebel and Erik Meijer, we are happy to announce the next GOTO Night that will take place on March 7 2013. This time at the Trifork office in Amsterdam on March 7 we have two great technical presentations lined up: Within the eye […]