https://issues.apache.org/bugzilla/show_bug.cgi?id=50297

--- Comment #3 from Stefan Bodewig <[email protected]> 2010-11-22 05:35:46 EST 
---
The Copy class predates Java2 and in particular the point in time when Ant
started to require a JDK 1.2 to run, that's why it is using "old" collections.

The real BWC problem is that the fields are protected.

Even though I think you are trying to solve the problem with the wrong
approach I now understand your usecase.  I've been thinking about a different
way to do what you want using built-in resource collections or selectors;
mappedresources would work if your union was in reverse order (i.e. you'd
only kee the first file of multiple files that mapped to the same name).

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