Download
FAQ History |
![]() ![]() ![]() |
API
Search Feedback |
The Example Servlets
This chapter uses the Duke's Bookstore application to illustrate the tasks involved in programming servlets. Table 15-1 lists the servlets that handle each bookstore function. Each programming task is illustrated by one or more servlets. For example,
BookDetailsServlet
illustrates how to handle HTTPGET
requests,BookDetailsServlet
andCatalogServlet
show how to construct responses, andCatalogServlet
illustrates how to track session information.
The data for the bookstore application is maintained in a database and accessed through the helper class
database.BookDB
. Thedatabase
package also contains the classBookDetails
, which represents a book. The shopping cart and shopping cart items are represented by the classescart.ShoppingCart
andcart.ShoppingCartItem
, respectively.The source code for the bookstore application is located in the
<
INSTALL
>/jwstutorial13/examples/web/bookstore1/
directory created when you unzip the tutorial bundle (see Building and Running the Examples). A samplebookstore1.war
is provided in<
INSTALL
>/jwstutorial13/examples/web/provided-wars/
. To build, package, deploy, and run the example:
- Build and package the bookstore common files as described in Duke's Bookstore Examples.
- In a terminal window, go to
<
INSTALL
>/jwstutorial13/examples/web/bookstore1/
.- Run
ant
build
. This target will spawn any necessary compilations and copy files to the<
INSTALL
>/jwstutorial13/examples/web/bookstore1/build/
directory.- Start Tomcat.
- Perform all the operations described in Accessing Databases from Web Applications.
- Run
ant
install-config
. Theinstall-config
target notifies Tomcat that the new context is available. See Installing Web Applications.- To run the application, open the bookstore URL
http://localhost:8080/bookstore1/bookstore
.To deploy the application:
Troubleshooting
The Duke's Bookstore database access object returns the following exceptions:
BookNotFoundException
--Returned if a book can't be located in the bookstore database. This will occur if you haven't loaded the bookstore database with data by runningant
create-book-db
or if the database server hasn't been started or it has crashed.BooksNotFoundException
--Returned if the bookstore data can't be retrieved. This will occur if you haven't loaded the bookstore database with data or if the database server hasn't been started or it has crashed.UnavailableException
--Returned if a servlet can't retrieve the Web context attribute representing the bookstore. This will occur if the database server hasn't been started.Because we have specified an error page, you will see the message
The application is unavailable. Please try later
. If you don't specify an error page, the Web container generates a default page containing the messageA Servlet Exception Has Occurred
and a stack trace that can help diagnose the cause of the exception. If you useerrorpage.html
, you will have to look in the server log to determine the cause of the exception. Web log files reside in the directory <JWSDP_HOME
>/logs
and are named jwsdp_log.<
date
>.txt
.
Download
FAQ History |
![]() ![]() ![]() |
API
Search Feedback |
All of the material in The Java(TM) Web Services Tutorial is copyright-protected and may not be published in other works without express written permission from Sun Microsystems.