I did not notice this anywhere in the forum - sorry if I'm reposting. Hope this is helps someone else.
For Servlet-2 be sure to notice that the html snippet for creating the form needs to have the action statement changed from ...
action='/servlet/ReverseServlet'
to ...
action='/servlet/Reverse'
Going with the convention from earlier assignments, the assignment title implies that the
java class be called Reverse.class (not ReverseServlet.class).