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Validating user input in the presentation layer and ensuring that no SQL injection attacks are possible is good enough for a simple login screen. But what if you need to validate a User object before it s saved in the database for example, during an account registration procedure You need more complex validation: You have to check the length of the entered username and see whether any illegal characters have been used, and you also need to validate the quality of the password. All this can be solved with more

If you have more than one hardware profile configured on a computer (see 6, Installing, Managing, and Troubleshooting Hardware Devices and Drivers, for more on hardware profiles), you can also use the Log On tab to control whether a service is enabled or disabled for a particular profile. Click a profile, and then click Enable or Disable.

By default, when a service fails to start, Windows XP Professional records an error in the System log file (see Lesson 2, Using Event Viewer, for more about this), but takes no further action. Services that are dependent on the failed service also fail to start. You can configure certain recovery actions to occur when a service fails to start, though. To set up recovery actions to take place when a service fails, use these steps: 1. In the Services console, right-click the service, and then click Properties. 2. In the Properties dialog box for the service, click the Recovery tab. The Recovery tab (see Figure 18-4) lets you configure an action to take on the first failure, the second failure, and on all subsequent failures. The actions you can configure include the following:

1. 2. 3.

and possibly custom validation in the JSF presentation layer, but the database schema also must validate the integrity of stored data. For example, you create database constraints that limit the length of the value stored in the USERNAME column or require a successful string-pattern match. In any sophisticated application, input validation is a concern that needs to be handled not only in the presentation layer, but in several layers and even in different tiers. It s a crosscutting concern that can affect all your code. With Hibernate Validator, you can isolate and encapsulate validation and data integrity rules easily, for all application layers.

Take No Action. This is the default choice. Restart The Service. Windows attempts to restart the service if the service does not start. Run A Program. Windows runs a custom program, which you can use to log error details or even send a notification of the failure. When you select this action, the options in the Run Program section of the Recovery tab become available. Type the path for the program and any command-line parameters you want to use, and indicate whether you want Windows to add the fail count (the number of times the service has failed) to the end of the command. Restart The Computer. Windows restarts the computer. This option provides a good last resort for recovery on important services. Often, a service does not start because services on which it is dependent failed. You should use this setting only on server computers. If a client computer automatically restarted, it could disturb the user s work.

For the exam, remember the actions you can have Windows take should a service fail: Take No Action, Restart The Service, Run A Program, and Restart The Computer. Typically, you should have Windows attempt to restart the service on the first or second failure. You should have Windows attempt to restart the computer only when a service fails that is vital to the computer s role and when restarting will not interfere with the desktop environment.