You could use a ServletContextListener (will be called once during
deployment/undeployment) or just create your thread pool lazily, e.g.
schedule(Job job) {
if(workerPool == null) { createPool(); }
workerPool.schedule(job);
}
Also you might want to take a look at Guava's Service abstraction. Maybe it
fits your needs:
https://code.google.com/p/guava-libraries/wiki/ServiceExplained
https://plus.google.com/118010414872916542489/posts/86dUfeQk5dH
-- J.
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