Using CFApplication Inside Of ColdFusion's Application.cfc : Kinky Solutions : A Student's Perspective by Ben Nadel

Using CFApplication Inside Of ColdFusion's Application.cfc

Posted May 29, 2007 at 8:43 AM

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:

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<cfcomponent>
<cfapplication
name="CFApp In AppCFC"
/>
<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:

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<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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Reader Comments

Which is probably a good thing. ;)

I wonder what happens if you try the same code inside onRequestStart?

Posted by Raymond Camden on May 29, 2007 at 8:56 AM

I was just wondering the same thing so I tried it out. Moving the code to the OnRequestStart function works just fine.

Posted by Joshua Cyr on Apr 14, 2008 at 4:09 PM

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