Thank you, Christopher. It appears that I now have to ways to solve my
problem. Calling shutdown() stops the threads orderly, so I think I'll
opt for the ContextListener, although I am not 100% sure.
Christopher Schultz wrote:
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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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