Pending CCC approval of BugID 4387087 : "Several Drag & Drop methods should be
declared to throw HeadlessException", the 'public static final Cursor' fields
of the java.awt.dnd.DragSource class will become null in a headless environment.
The javadoc for each of these fields should be updated to state this.

We have cleared this change with Sergei Dmitriev on the JCK team. No CCC
request will be filed for this doc change.