Use $ to Instantiate Java Nested Static Classes in ColdFusion
- April 4, 2009 3:16 PM
- ColdFusion
- Comments (0)
Ok, so this isn't news; apparently its common knowledge to some that you can instantiate a nested Java class by using a $ instead of a . in the name:
<cfset local.RoundRectangle2D = CreateObject("java", "java.awt.geom.RoundRectangle2D$Float") />
I'm posting this because I found it impossible to locate this information on the web. I even had an Adobe tech tell me he was logging a bug that CF couldn't handle nested classes, because even he didn't seem to know that you could do this. Its now in the CF8 LiveDocs, and its now on my website. Perhaps the next person in line will be able to find it easier.
Ok, so a new one on me... ColdFusion has started to intermittently fail to find a CFC when trying to instantiate it. I started getting emails that the system was erroring out because it failed to find a component for part of a process in our system, but when I went back to try it myself, things worked fine. I dismissed it as odd until it started to happen more often. Click "more" to see how I replicated the problem and help me figure out what is going on.
One technique I often use is to create gateway objects to my database that allow the user to pass in multiple IDs, rather then a single one. I've run into a problem though; what if the user passes through something that is a valid list, but is not a valid list of the type I need? Read more to see ListIsValid() abd ListRemoveInvalid().