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Carsten,
On 6/17/2009 4:33 AM, CBy wrote:
> O'Reilly's Tomcat The Definitive Guide advises me to invoke the
> setDaemon(true) method on any Thread object a web application creates to
> keep them from hanging the JVM when Tomcat shuts down. My web service,
> however, uses a thread pool that is created via
> java.util.concurrent.Executors.newFixedThreadPool(NTHREADS) and I don't
> know how to make them daemon threads in this case.
Can you adjust that code? If so, use the form of that method that takes
a ThreadFactory object. Something like this ought to do it:
public class DaemonThreadFactory
implements ThreadFactory
{
public Thread newThread(Runnable r)
{
Thread t = new Thread(r);
t.setDaemon(true);
return t;
}
}
> My new plan was to register a shutdown hook with the JVM in my web
> service and to invoke shutdown() or shutdownNow() on the ExecutorService
> in it (the method above returns an ExecutorService). Unfortunately, this
> does not seem to work.
You should do as André suggests and use a ServletContextListener. You
should probably use the same listener to both create and teardown the
thread pool.
I recently had my first experience with Executors in Java. I have to say
that I love 'em. So simple, yet so powerful.
- -chris
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