Critical Description
I don't see any way that you can dynamically compile two (or more) interdependent classes via GroovyClassLoader.parse(String).
E.g.
abstract class A extends B
{
}
class B
{
void aMethod(A a)
}
Parsing A first complains about not finding B.
Parsing B first complains about not finding A.
Perhaps there should be a batch method to compile multiple source text Collection<String> etc. that internally works out the correct order to do it and returns compiled classes.