More informative is the message that is displayed in the console:

getFirstNumber: 0
getSecondNumber: 0
processAction called
The id of the component that fired the action event: submitButton
Action command: submit
----------- Component Tree -------------
null
  addForm
    firstNumber
    secondNumber
    output
    submitButton
----------------------------------------
setFirstNumber: 10
setSecondNumber: 20
getFirstNumber: 10
getSecondNumber: 20
getResult: 30

Creating the Validator Example

The example presented in this section demonstrates how you can validate user input very easily in JSF. This application is even simpler than the one presented in the previous section. It consists of only one JSP page, and it does not require a JavaBean or an application configuration file. However, you will still need a directory structure for the application and the deployment descriptor. The deployment descriptor is the same as the one in Listing 1. Here, we will look at the directory structure and JSP page.

Creating the Directory Structure for the Validator Example

The directory structure for your application, called JSFCh02b, is depicted in Figure 8. In Tomcat, you create this under webapps. The directory contains all the required components that you will build in this example.

Again, you must copy the .jar files containing the JSF implementation into the WEB-INF/lib directory. Then, in the application directory, you have the validatorTest.jsp page.

Remember: This is part one of the second chapter of JavaServer Faces Programming, by Budi Kurniawan (McGraw-Hill/Osborne, ISBN 0-07-222983). Stay tuned for more helpful chapters from McGraw-Hill/Osborne. Buy this book!