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(Notice that the convenience method addChildCategory() sets both ends of the association link in one call, as described earlier in the book.) It would be undesirable to have to save each of the three new categories individually in a new Session. Fortunately, because you mapped the childCategories association (the collection) with cascade="save-update", you don t need to. The same code shown earlier, which saved the single Laptops category, will save all three new categories in a new Session:

status, the disk might have failed entirely. Restart the computer to determine whether the disk will become accessible. If it is a dynamic disk, attempt to repair the disk by right-clicking it and selecting Rescan Disks. Unrecognized The disk is an unknown type, and Windows XP cannot recognize it.

No Media This status is on drives with removable media, such as a CD-ROM drive, when the drive is empty. Volume status types and the recommended action (if required) are as follows: Healthy The volume is accessible and has no detected problems.

Session session = sessionFactory.openSession(); Transaction tx = session.beginTransaction(); // Persist all three new Category instances session.save(laptops); tx.commit(); session.close();

Healthy (At Risk) If the disk status is Online (Errors), the volumes will be accessible, but all volumes will display this status. Restoring the disk to Online will clear this status from the volume. Initializing The volume is in the process of initializing. No action is required. After the initialization is complete, the volume should show a status of Healthy.

Windows XP contains built-in support for both CD-ROM and DVD-ROM devices. Windows XP also supports a number of other removable media types, such as tape drives and memory storage. This section covers the monitoring and troubleshooting of removable media.

You re probably wondering why the cascade style is called cascade="save-update" rather then merely cascade="save". Having just made all three categories persistent previously, suppose you make the following changes to the category hierarchy in a subsequent event, outside of a Session (you re working on detached objects again):

Most CD-ROM and DVD-ROM devices are Plug and Play compliant and therefore require little configuration. To view the status and configuration of these types of devices, access the device s Properties dialog box through Device Manager. The General tab of the device s Properties dialog box indicates whether the device is functioning properly within Windows. If Device Manager indicates that the device is installed and functioning, yet the device does not appear to be working properly, there might be a physical problem with the device installation, or the device itself might be faulty. If the disk tray does not eject properly, or if the power/usage light-emitting diode (LED) indicators are not illuminated, open the computer and verify that all connections have been properly established. If a CD or DVD device appears to read data correctly but does not play back audio, there is most likely a device driver problem, or additional required components are not currently configured. Always verify that the device is listed in the Windows Catalog. Also, make sure that the latest version of the device driver and associated software is installed.

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laptops.setName("Laptop Computers"); // Modify laptopUltraPortable.setName("Ultra-Portable Notebooks"); // Modify laptopTabletPCs.setName("Tablet Computers"); // Modify Category laptopBags = new Category("Laptop Bags"); laptops.addChildCategory(laptopBags); // Add

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To troubleshoot an audio playback problem, take the following additional steps:

You add a new category (laptopBags) as a child of the Laptops category, and modify all three existing categories. The following code propagates all these changes to the database:

Verify that the sound card is properly configured and functional. Verify that the speakers are plugged in and turned on. Verify that the sound has not been muted. Verify that the audio cables connecting the CD/DVD to the sound card are properly connected. Make sure that the CD is clean.

The final component in a successful update strategy is ensuring that updates deploy correctly to client computers. There are many reasons why updates might not deploy correctly to client computers, including but not limited to the computer being switched off for a lengthy period of time, synchronization problems, and lack of disk space on the client. One of the simplest ways that you can verify the updates that are installed on local and remote computers running Windows 7 and which are members of the same domain is to manually use the Get-Hotfix Windows PowerShell command. You can use the Computername option to specify the address of the remote computers that you want to check. For example, the command