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In chapter 17, you learned how to download and compile a new Linux kernel from http://www.linux.org. Assuming you tried to do this, you might have experienced the situation where your new kernel didn t continue to load after the initial boot. Specifically, you might have seen an error message complaining about a missing device, such as a console. Or your boot sequence might have hung in a manner similar to what you see in Figure 19-9.

It s tempting to put a simple JavaScript expression in the OnBegin handler or its counterparts, but this causes a syntax error in the generated onclick handler for the anchor tag. Make sure you reference the JavaScript function by name (without parentheses) like this: OnBegin = "ajaxStart".

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omponents of a system can change state and may need to inform other components that this change has happened. JavaBeans and user-interface elements such as AWT or Swing objects use events to signal these changes. Jini also has an event mechanism, and this chapter examines the distributed event model that is part of Jini. It looks at how remote event listeners are registered with objects, and how these objects notify their listeners of changes. Event listeners may disappear, and so the Jini event mechanism uses leases to manage listener lists. This chapter also covers how leases are managed by event sources. Finally, we ll consider how events can be used by applications to monitor when services are registered or discarded from service locators.

If this happened to you, your system might be using an old version of udev. For example, this can happen if you have an older version of CentOS or Fedora. Linux uses the udev command to manage devices that your system uses, such as hard disks and/or optical drives. udev is responsible for creating special files such as hda to represent the first IDE hard disk inside the /dev directory of your system. The problem lies in the fact that udev can t create the required device entries because it might be an old version that contains problems. Fixing this doesn t require that you re-create each device that the udev command must make during boot up. You need to create only three types inside the /dev directory of your system: the console, the null, and the tty devices. Linux uses the console device to leverage devices assigned as consoles. With console devices, you can enter commands to use your system. Linux uses the null device as a general garbage bin for useless data or unneeded output. The tty devices lets Linux create terminals for you to log into the system.

The Ajax link is just one of the helpers that invokes an action asynchronously. It s useful in scenarios where the logic is simple, such as notifying the server of an action or retrieving a simple value. For more complicated scenarios, where there s data to be sent to the server, an Ajax form is more appropriate. The Ajax form is created with an Ajax helper called Ajax.BeginForm. It behaves much like the Hijax technique discussed in section 12.3.2. Its usage is similar to the Ajax action link: