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A user should have at least five different passwords before using a previously used password. After changing a password, a user must wait 24 hours before he or she can change it again. A user should change his or her password every three weeks.

Configuring Account Policies 16-21

However, as soon as you introduce a third tier and move the presentation layer to a separate virtual machine, the current persistence context can t be held open anymore until the view has been rendered. This is typically the case in three-tiered EJB application, or in an architecture with a rich client in a separate process. If the presentation layer runs in a different process, you need to minimize the requests between this process and the tier that runs the business and persistence layers of the application. This means that you can t use the previous lazy approach, where the view is allowed to pull data from the domain model objects as needed. Instead, the business tier must accept responsibility for fetching all data that is needed subsequently for rendering the view. Although certain patterns that can minimize remote communication, such as the session facade and data transfer object (DTO) patterns, have been widely used in the Java developer community, we want to discuss a slightly different approach. The Command pattern (often also called EJB Command) is a sophisticated solution that combines the advantages of other strategies. Let s write a three-tiered application that utilizes this pattern.

7. Close the Local Security Settings window. 8. Log on as User13 with no password. Windows XP Professional displays a Logon Message message box, indicating that you must change your password at first logon. 9. Click OK to close the message box. 10. Press TAB to move to the New Password text box and leave the Old Password text box blank. 11. In the New Password and Confirm New Password text boxes, type hotwater, and then click OK. Windows XP Professional displays a Change Password message box, indicating that your password was successfully changed. 12. Click OK to close the Change Password message box. 13. Click Start, and then click Control Panel. 14. Click User Accounts, and then click Change My Password. 15. In the Type Your Current Password text box, type hotwater. 16. In the Type A New Password and Type The New Password Again To Confirm text boxes, type chocolate. 17. Click Change Password. 18. Were you successful Why or why not

16-22

The Command pattern is based on the idea of a hierarchy of command classes, all of which implement a simple Command interface. Look at this hierarchy in figure 16.2. A particular Command is an implementation of an action, an event, or anything that can fit a similar description. Client code creates command objects and prepares them for execution. The CommandHandler is an interface that can execute Command objects. The client passes a Command object to a handler on the server tier, and the handler executes it. The Command object is then returned to the client.

Ralph s first mistake was to install the Windows 7 AIK on the computer he wanted to image. He should have installed Windows AIK on another computer. Ralph also neglected to run Sysprep.exe with the /generalize parameter on the Windows 7 computer before attempting to image it. Finally, ImageX.exe generated an error because the program cannot capture an image of a system disk while the operating system is running. To perform a successful image capture, Ralph must create a Windows PE boot disk on the computer running the Windows 7 AIK and use that to boot the new Windows 7 workstation. Then he can run ImageX.exe and successfully capture an image.

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