Execution path of an file at runtime

Question

I have dir stucture like this
D:\first;
D:\first\second;
both of these are included in my classpath.
I have a package structre as
com.myName.MyPack
The above package is stored in both the structures mentioned above.
FileName.class is a file inside the package, and hence can have two absolute paths
D:\first\com\myName\MyPack\FileName.class
D:\first\second\com\myName\MyPack\FileName.class
The Command
java com.myName.MyPack.FileName
is given form the D: itself.
Now I need to know which class is called (it might be any of the two as the classpath is set in the users system).
I need to get the absolute path of the class which is loaded by the classLoader how do I do it.
Is there any api or method to know the above

Answer 1

Double-posted here: http://forum.java.sun.com/thread.jsp?thread=416540&forum=31&message=1840525