Instruct: Classify Amazon reviews into positive or negative sentiment
Query: poorly written book

this book was written in a hurry to make some quick bucks. it jumps from topic to topic without any focus. examples contain too many errors. most of them will not work without debug and rewrite. some of the code are not printed in the book but used by other codes in the book. it is very confusing. it seems that the author just dumped some codes he wote when he was learning jsp and servlet. you won't get much out of this one.