Inner vs. Outer Join

Here is a really good visual explanation of different types of SQL joins. I was recently asked what the difference was, and while I knew the answer, I fumbled to articulate it. I should have simply said “An inner joint results in a subset or overlap of results and an outer join results in a […]

Apache Commons Configuration with JBoss 5

Here’s a problem that frustrated me for a bit: When using Apache Commons Configuration under JBoss 5, I kept running into the following error when attempting to save to my configuration file (which was a resource under the deployed /classes path): ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[localhost].[/xxxx].[xxxx]] (http-0.0.0.0-8080-1) Servlet.service() for servlet flint threw exception java.net.UnknownServiceException: protocol doesn’t support output […]