Last week, I gave a Nylon Technology presentation on ColdFusion's Application.cfc component. While giving the presentation, it occurred to me - if Application.cfc is a component just like any other and it really just defines a ColdFusion application, I wonder what would happen if you use ColdFusion's CFApplication tag inside of the Application.cfc. To test this, I set up a very simple Application.cfc:
<cfcomponent> <!--- Define application. ---> <cfapplication name="CFApp In AppCFC" /> <!--- Define page settings. ---> <cfsetting requesttimeout="5" /> <!--- Set an application variable just to be able to echo something out in our CFDump. ---> <cfset APPLICATION.CFAppTest = "Interesting" /> </cfcomponent>
The Application.cfc does not contain anything Application.cfc-related; it acts merely as a container for the CFApplication tag. It then uses a standard CFSetting tag and attempts to set an APPLICATION variable that we would echo in a later CFDump.
Then, in index page, all I am doing is CFDumping out the APPLICATION scope:
<cfdump var="#APPLICATION#" label="CFApplication Test" top="10" />
Running this page throws the following ColdFusion error:
5 >= 0
Not one of ColdFusion's most intuitive errors (something similar to what is seen when using CFQueryParam and cached database structures), but since I was testing something very specific, I knew what caused it. Apparently, you cannot use the ColdFusion's old CFApplication inside of its new Application.cfc component.
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