fedex rates

I am using some code I got from this web site (not sure who the author is) to tap into FedEx's rate API.
http://cfsearching.blogspot.com/2007/12/how-heck-do-you-use-fedex-rate-web.html 


If I try to put a CF variable in the second line below it errors out.  If I put a 1 or 2 in there statically it works fine.  The list has one entry in it so the list is fine.

<cfset objNonNegInteger = createObject("java", "org.apache.axis.types.NonNegativeInteger") />

<cfset data.requestedShipment.packageCount = objNonNegInteger.init("#listLen(attributes.PkgWeights)#")>


Here is the error:
Unable to find a constructor for class org.apache.axis.types.NonNegativeInteger that accepts parameters of type ( java.lang.Integer ).


Is CF processing the objNonNegInteger function before it processes the ListLen() function?



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