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NPEs, OnRequest, And Other Mysteries
By Raymond Camden
Expert Author
Article Date: 2007-09-12
A friend wrote to me this morning with an interesting problem.
He recently moved his site (hosted at CrystalTech) from ColdFusion 7 to ColdFusion 8.
Then he began to get NPEs (Null Pointer Exceptions) in regards to cfquery tags. He would get these about once per 1-2k hits.
But get this - CystalTech recommended adding a blank onRequest:
<cffunction
name = "onRequest"
access = "public"
returnType = "boolean"
output="true">
<cfargument
name = "thePage"
type = "string"
required = "true">
<cfinclude
template="#arguments.thePage#">
<cfreturn true />
</cffunction>
And it worked! He no longer got the NPE error. Now I don't know about you - but I can't imagine any reason why this change would make his error go away.
Can anyone else think of a reason why it would help?
As for the NPE in general - one thing I've asked him if is the cfquery was in a CFC and he possibly forgot to var scope.
Not that I think it would make a NPE, but the lack of var scoping is something that could lead to random errors like he observed.
Comments
About the Author:
Raymond Camden, ray@camdenfamily.com
http://ray.camdenfamily.com
Raymond Camden is Vice President of Technology for roundpeg, Inc. A long
time ColdFusion user, Raymond has worked on numerous ColdFusion books
and is the creator of many of the most popular ColdFusion community web
sites. He is an Adobe Community Expert, user group manager, and the
proud father of three little bundles of joy.
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