After doing some further testing, I found that

   <s:updownselect
       list="courseList"
       name="nonsenseName"
       listKey="uuid" listValue="displayName"/>

works, but

   <s:updownselect
       list="courseList"
       name="selectedCourses"
       listKey="uuid" listValue="displayName"/>

Does not.  selectedCourses is a String array on my action object, and before
this issue popped up, I was using OGNL to autopopulate the array with the
selected ids from courseList.

Now, every variation on "selectedCourses" raises this error.

(I've tried
selectedCourses
'selectedCourses'
%{selectedCourses}
%{'selectedCourses'}
so far).

-Brian

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