How to set an acknowlegement before JVM shuts down?

Question

How to set an acknowledgement (like email or SMS) before JVM shuts down (this is on the server side, not client)?

Answer 1

You may be able to use the Java Shutdown Hook mechanism for this.

It's explained here: http://java.sun.com/j2se/1.5.0/docs/guide/lang/hook-design.html .

Answer 2

I'd recommend writing a Thread and adding it as a runtime hook. You can see examples here.

Answer 3

You need to add a 'shutdown hook' to the JVM, as described in the Runtime class:

http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Runtime.html#addShutdownHook%28java.lang.Thread)

If you wanted to print out a message when shutting down, you'd do:

Runtime.getRuntime().addShutdownHook(new Thread() { public void run() {
  System.out.println("Goodbye, world!");
} } );

Obviously, fill in the 'goodbye world' bit with what you want.

Answer 4

Already accepted answer but is this for server or client side?