hello!!

can anyone help me.
I am a studying from a Book "Beginning JSP WEB Development.
I am in Chapter 7 where i have created a class Book. Efter that i have created a class ChildrenBook and TechnicalBook which are inheritance of the class Book.
I have saved all my file in &CATALINA_HOMe%\webapps\begjsp-ch07\WEB-INF\classes\com\wrox\library.
I can compile class Book, but I cannot compile Class ChildrenBook and TechnicalBook.

I get a following message when I do so
cannot find symbol class Book
public class ChildrenBook extends Book
1 error

see that the Book.class is in your class path.
As the other two classes are extending it the base class should be in class path.

- Rakesh

I have all three classes Book, ChildrenBook and Technical Book in the same folder %CATALINA_HOME%\webapps\begjsp-ch07\com\wrox\library.

but still i get that message.

I mean to say that if Book is in a separate package then you need to see that all the classes are placed in proper directories. for example if Book class is in a package com.wrox.library.chap7and the other two are in com.wrox.library.chap7.sub then the .class file should be in the following directories

Book.class -> WEB-INF/classes/com/wrox/library/chap7
Other two .class files -> WEB-INF/classes/com/wrox/library/chap7/sub

You can use the -d option while compiling java file and specify where to put the .class files, so that all the package directory structure will be taken care by the compiler itslef.

If you give javac -d . *.java the all the .java files will be compiled and placed in the current directory and package directory structure will be created by the compiler itself.


- Rakesh