If you write network services using Java, you should look into the Java Service Wrapper (JSW). The JSW turns Java programs from weak delicate creatures easily killed by an errant Ctrl-C into robust network services that boot up automatically, ignore most signals, and restart automatically following crashes. It's free for open source programs and has very reasonable licensing fees for commercial software.
We use JSW on several of our projects including the Tungsten Replicator and the Tungsten Connector. I just checked in a new project on our Tungsten Commons site with an Ant script that automatically copies the open source versions of JSW into a project directory with a conventional layout including bin and lib directories. Check it out here if you would like an example of how to automate addition of JSW wrappers to your own Java projects.
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