orig synopsis:
  "JDK 1.1.x: calling List.removeAll on empty list generates
motif warning message"

If you create a java.awt.List, and call removeAll on it when it is empty,
you get an annoying message from Motif.

Warning:
    Name: slist
    Class: XmList
    Invalid item(s) to delete.

If you trace the calls down from List.removeAll, you get down to
src/solaris/sun/awt_List.c, in method: sun_awt_motif_MListPeer_delItems.
If called from removeAll, start = 0 and end = countItems() = 0.
Thus the code falls into:
if (start == end) {
XmListDeletePos(sdata->list, start);
which is incorrect, since there is no item to delete.