Force startup a computer automatically?

Question

We know how to force shutdown an computer using Java. For example, the following code works fine for force shutdown:

public static void main(String arg[]) throws IOException{
    Runtime runtime = Runtime.getRuntime();
    Process proc = runtime.exec("shutdown -s -t 0");
    System.exit(0);
}

Now, suppose if I want to force startup a computer (which is in shut down state), at a particular time, is it possible to do in Java or any other language?

Answer 1

You need something to trigger the startup. The best way to trigger this is Wake On Lan.

If you want to do this in Java, this might be a good resource.

Answer 2

In addition to wake on lan, there are IPMI devices that run on some server-grade hardware that is connected to the motherboard and can control power as well as provide serial console output over a network connection. This computer is running all the time, but I'm not familiar with any you can load your own code onto.

You can control this device remotely to power control the server that is off from any language including java.

http://en.wikipedia.org/wiki/Intelligent_Platform_Management_Interface