Clustering scheduled jobs with Quartz and Terracotta
We’re using Quartz to handle scheduled jobs in our java applications. Since we cluster our apps for failover using Terracotta, we need to address the issue of how to failover… Read more »
Author Archives: roger
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 »