By the way, I have posted the same problem on the Beginning JSP forum but nobody was still able to help. Here's how I'm doing it and the error code I'm getting:

C:\jakarta-tomcat-4.0\webapps\begjsp-ch07\WEB-INF\classes\com\wrox\library>javac TechnicalBook.java
TechnicalBook.java:3: cannot resolve symbol
symbol : class Book
location: class com.wrox.library.TechnicalBook
public class TechnicalBook extends Book {
                                   ^
1 error