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Overwrite Events Older You might lose information if the log becomes full before you archive Than X Days it, but Windows XP Professional will lose only information that is at least x days old. Enter the number of days for this option. The default is seven days. Do Not Overwrite Events This option requires you to clear the log manually. When the log becomes full, Windows XP Professional will stop, but no security log entries will be overwritten.

Using Event Viewer 18-17

2. 3.

Seam calls the component s destroy() method at the end of the JSF request, when the event context is destroyed. The EJB 3.0 container removes the stateful session bean because the method is marked with @Remove. User input validation is often more complex than checking a single value on a single object. Seam calls Hibernate Validator for all bound entity instance of the registration form. However, a duplicate check of the entered username requires database access. You could write your own Hibernate Validator extension for this purpose, but it seems unreasonable to always check the database for a duplicate username when a User object must be validated. On the other hand, it s natural that business logic is implemented with procedural code, not completely declaratively. So far, Hibernate Validator does nothing. If you submit the registration form without entering any values, only the built-in JSF validator for required="true" runs. You get a built-in JSF error message on each input field that says that a value is required. Annotating the entity class Hibernate Validator isn t active because there are no integrity rules on the User entity class, so all objects pass the validation test. You can add validation annotations on the fields or on the getter methods of the entity class:

Saving logs allows you to maintain a history of events. Many companies have policies on archiving logs for a specified period especially auditing-related events in the Security log. To work with a log, right-click the log you want to configure in Event Viewer, and then click one of the options described in Table 18-4.

Table 18-4

package auction.model; import ... @Name("user") @Role(name = "currentUser", scope = ScopeType.SESSION) @Entity @Table(name = "USERS") public class User implements Serializable { @Id @GeneratedValue @Column(name = "USER_ID") private Long id = null; @Column(name = "USERNAME", nullable = false, unique = true) @org.hibernate.validator.Length( min = 3, max = 16, message = "Minimum {min}, maximum {max} characters." ) @org.hibernate.validator.Pattern( regex="^\\w*$", message = "Invalid username!" ) private String username;

Do this Click Save Log File As, and then type a filename. Click Clear All Events to clear the log. Windows XP Professional creates a security log entry, stating that the log was cleared. Click Open Log File. Click New Log View to create a second view of the selected log. By default, this view is named the same as the original view with a copy number appended in parentheses. For example, if you create a new view of the System log, the default name for the new view is System (2). Right-click the new view and click Rename to change the name. You can use different views to look at log files filtered different ways or to open saved logs.

The following questions are intended to reinforce key information presented in this lesson. If you are unable to answer a question, review the lesson materials and try the question again. You can find answers to the questions in the Questions and Answers section at the end of this chapter. 1. What are the three Windows XP Professional logs you can view with Event Viewer, and what is the purpose of each log

@Column(name = "`PASSWORD`", length = 12, nullable = false) private String password; @Column(name = "FIRSTNAME", length = 255, nullable = false) private String firstname; @Column(name = "LASTNAME", length = 255, nullable = false) private String lastname; ...}

18-18

18