There are 5 printed books about Struts available now.
Which one can you advice?
Being the author of the O'Reilly book, it wouldn't be right for me to suggest mine :) However, this question has been posted to the Struts user mailing list. I would search the list.
The easiest way to do that is here: http://nagoya.apache.org/eyebrowse/SummarizeList?listId=42.
For that answer I should go with yours!