deprecated 1.7; will be removed in Ant1.8
Just use WeakReference directly.
public class WeakishReference
These classes are part of some code to reduce memory leaks by only
retaining weak references to things
on Java1.2+, and yet still work (with leaky hard references) on Java1.1.
Now that Ant is 1.2+ only,
life is simpler and none of the classes are needed any more.
They are only retained in case a third-party task uses them