As it turns out, coldfusion.runtime.Array datatypes turn into java.util.Vector datatypes after WDDX deserialization. This isn't much of a problem for the most part. After all, the CFMX Array datatype is based on the Java Vector datatype. CF still views it as an array, and you can still treat it just like an array in CF code. However, there is at least one place it *does* matter - invoking and consuming webservices. It seems that when one of these java.util.Vector datatypes is passed to certain webservices, you will get the infamous and annoyingly indescriptive error that it "Could not perform web service invocation "X" because java.lang.IllegalArgumentException: argument type mismatch". Yowza. I've confirmed the behavior with some folks at Adobe, so hopefully it will be corrected with the Scorpio release. In the meantime however, I am getting around this problem by recreating/rebuilding the array before posting it to the webservice. A little annoying, but it works. If you want to test this gotcha yourself, here's some sample code to play with: <cfscript> testObj = arrayNew(1); </cfscript> <!--- returns coldfusion.runtime.Array ---> <cfoutput> Object Type Before: #testObj.getClass().getName()#<br /> </cfoutput> <!--- serialize/deserialize array ---> <cfwddx action="cfml2wddx" input="#testObj#" output="x" /> <cfwddx action="wddx2cfml" input="#x#" output="testObj" /> <!--- returns java.util.Vector ---> <cfoutput> Object Type After: testObj.getClass().getName()#<br /> </cfoutput>

You still have time to RSVP for the San Diego Blog Thing being held on Monday, Jan 16th 2006. I'm planning on attending Part 2, which is at the Rock Bottom Brewery from 7pm-10pm. See you there!