GroovyClassLoader and loading external groovy code

Hi

I am trying to use a groovy class in my build.gradle that is defined
in a separate file. Because I want all my build scripts to not require
external configuration (like classpath) I am trying to dynamically
load the groovy code from within the gradle buildfile. I found two
items that seem to help with this:

http://groovy.codehaus.org/Influencing+class+loading+at+runtime
http://www.nabble.com/run-main%2C-package-all-libs%2C-run-easyb-td22395236.html#a22410033

Both say that you should add the URL to the root GroovyClassLoader.
However, when I try this in my build.gradle:

createTask('play') {
    println 'rootLoader: '+this.class.classLoader.rootLoader
    def classLoader = this.class.classLoader
    while (classLoader != null) {
        println 'parent loader '+classLoader.class+'  '+classLoader
        classLoader = classLoader.parent
    }
}

I get this:
crotwell$ gradle play
:TauP:play
rootLoader: null
parent loader class java.net.URLClassLoader  java.net.URLClassLoader@c9e1cc
parent loader class java.net.URLClassLoader  java.net.URLClassLoader@cd8669
parent loader class java.net.URLClassLoader  java.net.URLClassLoader@337838
parent loader class sun.misc.Launcher$ExtClassLoader
sun.misc.Launcher$ExtClassLoader@cc7ad6

BUILD SUCCESSFUL

and so it would seem that there is no GroovyClassLoader in the class
loader hierarchy that you get from this.class.classLoader. That seems
strange as I thought we were using groovy inside of a Task.

I found another post that just constructed a GroovyClassLoader and used it,
http://www.mail-archive.com/user@.../msg01296.html
Which more or less works. If I create a GroovyClassLoader myself, I
can load my class, but it of course is missing all the gradle stuff so
I can't do something like:
import org.gradle.api.artifacts.report.IvyDependency

So, what is the correct way to load groovy code from a separate file
into a gradle build, and still have access to the gradle classes?

And if the root GroovyClassLoader is the correct way, how do I get it?

thanks,
Philip

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