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02.13.07
Null Java References In Coldfusion 6 Vs 7
 By Pete Freitag
ColdFusion 7 appears to be much better at passing null values to a java object.
ColdFusion 6 however likes to block you from doing it, even when you want to.
I am tring to work with a java API that requires me to pass a null value to a method.
Since CFMX 6 has no way of creating a null value I though I would use the Java API to concoct one.
So I did something like this:
vector = CreateObject("java", "java.util.Vector");
vector.setSize(1);
someAPI.methodThatRequiresANull(vector.get(0));
This works on ColdFusion 7, but on ColdFusion 6 it throws an exception:
The system has attempted to use an undefined value, which usually indicates a programming error, either in your code or some system code.
Null Pointers are another name for undefined values.
This trick isn't really useful because in ColdFusion 7 you can create a null value by calling JavaCast and using "null" as the type.
For example:
someAPI.methodThatRequiresANull( JavaCast("null", "") );
Does anyone know of a way to pass nulls that works in CF 6?
I know I could just write some java, but I want the solution to be pure CFML in this case.
Comments
Related Entries
* What's New in BlueDragon 7? - September 28, 2006
* DNS Query with ColdFusion - October 27, 2005
* Thread Priority, and Yielding - April 6, 2005
* Checking your JDBC Driver Version - March 31, 2004
* Determining the size of objects in memory - December 10, 2003
*Originally published at Pete Freitag's Homepage
About the Author:
Pete Freitag (http://www.petefreitag.com/) is a software engineer, and
web developer located in central new york. Pete specializes in the
HTTP protocol, web services, xml, java, and coldfusion. In 2003 Pete
published the ColdFusion MX Developers Cookbook with SAMs Publishing.
Pete owns a Firm called Foundeo (http://foundeo.com/) that specializes
in Web Consulting, and Products for Web Developers.
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