Weird racing clock problem on VMWare Linux Guests
A while back we installed a new Dell server with a low-power Xeon 3GHz L3110 CPU to run some other essential network infrastructure. We chose the specific server configuration because… Read more »
Adding AnnotatedConstraintBehavior to TextAreas
A while back I blogged about using an annotated constraint behavior to limit input in Wicket TextFields based on domain model annotations (https://blog.armstrongconsulting.com/?p=22). So if we annotate our domain models… Read more »
Using Wicket’s CheckBoxMultipleChoice
When I started with Wicket, I remember fighting with CheckBoxMultipleChoice for hours trying to get it to work. I just used it again today and was surprised at how easy… Read more »
How to display an enum in a dropdown in Wicket
Its often useful to use an enum as the model for a dropdown (or radio group) in Wicket, but not immediately obvious how to handle the display of the values…. Read more »
Mockito
We just started using Mockito for unit testing of our Wicket applications. Its a great tool, allowing us to easily mock out our service layers on a test-by-test basis. In… Read more »
Clustering wicket apps
After fooling around with other methods, we finally accepted the advice I got on the Wicket IRC channel and used Terracotta to cluster our Wicket-based apps running under Jetty. It… Read more »
Deploying with Continuum and Maven
We are now deploying to our staging servers from our Maven repository using wget (the url is like ‘http://maven:8080/nexus/service/local/artifact/maven/redirect? r=snapshots&g=com.armstrongconsulting.controlcenter.server &a=controlcenterwebapp&v=LATEST&e=jar&c=jar-with-dependencies’.). The runnable jars (or wars) in the Maven repository… Read more »
Hazelcast distributed locks for easy fault tolerance
Hazelcast (hazelcast.com) provides an easy way to implement distributed locking to allow your applications to run multiple, fault-tolerant instances without worrying about issues related concurrent access to shared resources (like… Read more »
Wicket dropdowns with mismatched models
Sometimes you have a class containing an id of another (lets say a Machine class containing an owner id rather than an Owner object). The owner id is actually a… Read more »
Enforcing multiple levels of page access in Wicket
In Wicket when you want to require user login for some pages, you typically inherit the pages from a superclass called say ProtectedPage and then use a wicket SimplePageAuthorizationStrategy to… Read more »