Hi,
I added a shutdown hook in my app, which works fine when I run it in
standalone mode, but which does not seem to get called when Tomcat stops.
The shutdown hook operates according to following the following semantics:
__________________________________________________________________________
class MyApp{
public void doSomething(){
ShutdownHook sdh = new ShutdownHook();
synchronized(Runtime.getRuntime()){
Runtime.getRuntime().addShutdownHook(sdh);
}
//
//do something here
//
logger.info("Finished doing something");
//remove shutdown hook once process has finished
sdh.setFinished();
if (!sdh.isInitialised()){
synchronized(Runtime.getRuntime()){
Runtime.getRuntime().removeShutdownHook(sdh);
}
}
}
private class ShutdownHook extends Thread {
private boolean INITIALISED = false;
private boolean FINISHED = false;
public void run() {
this.INITIALISED = true;
this.setPriority(2);
logger.debug("Shutdown hook: shutdown thread started - a
shutdown has
been requested");
out :
while (true) {
//keep on looping until the claaing app has finished
synchronized(this.FINISHED){
if (this.FINISHED == true) {
logger.debug("Shutdown hook: parent
program finished, allowing
shutdown process to complete");
return;
}
}
}
}
public synchronized boolean isInitialised() {
return this.INITIALISED;
}
public synchronized void setFinished() {
this.FINISHED = true;
}
}
}
__________________________________________________________________________
The log does not show any trace of the shutdown hook being called, and
the process does indeed not complete before Tomcat shuts down, which to
me sounds like the hook is not getting registered properly for some
reason. Any ideas why this might be happening? I am running Tomcat
4.1.18 on Windows 2K (no advice about switching to Linux please).
Thanks,
Elie
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