Per subsystem error files in FW/1 - coldfusion

Question

I am trying to get per subsystem error files in FW/1. I know the following does not work.
variables.framework = {
...
error = getSubsystem() .error',
...
UPDATE
I tried
<cffunction name="onError">
<cfargument name="Exception" type="Struct" required />
<cfargument name="Event" type="String" required />
<cfif Arguments.Exception.Type EQ 'missinginclude' >
<cfoutput>#layout('#getSubsystem()#:default',view('login/error'))#</cfoutput>
<cfreturn false />
</cfif>
<cfreturn super.onError(ArgumentCollection=Arguments) />
</cffunction>
And I get an error of:
The EXCEPTION argument passed to the onError function is not of type Struct.
If the component name is specified as a type of this argument, it is possible that either a definition file for the component cannot be found or is not accessible.
The error occurred in /Applications/ColdFusion10/cfusion/wwwroot/Pluma/Application.cfc: line 189
187 : </cffunction>
188 :
189 : <cffunction name="onError">
190 : <cfargument name="Exception" type="Struct" required />
191 : <cfargument name="Event" type="String" required />

Answer 1

What you can do is override the onError method in your Application.cfc to manually call the relevant per-subsystem files.
Here's an example of handling missinginclude errors with a layout in a non-default subsystem:
<cffunction name="onError">
<cfargument name="Exception" type="Struct" required />
<cfargument name="Event" type="String" required />
<cfif Arguments.Exception.Type EQ 'missinginclude' >
<cfoutput>#layout('subsys2:default',view('main:errors/404'))#</cfoutput>
<cfreturn false />
</cfif>
<cfreturn super.onError(ArgumentCollection=Arguments) />
</cffunction>
Returning super.onError will result in the standard error handling being invoked.
For making it completely per-subsystem you could do something like view(getSubsystem()&':errors') or similar.
If you're doing potentially complex logic, remember to use appropriate try/catch - tracking errors in your error handling can be awkward.