java gateway shutdown.sh sends SIGTERM and waits for 5 seconds. if gateway is still running, that's declared to be a failure.

it is suggested to try harder - if shutdown doesn't happen for some reason (maybe broken jvm, maybe something else...), send SIGKILL.

it is suggested to increase the current timeout of 5 seconds to more before SIGKILL is sent - maybe 10 or 15. to avoid typing out all numbers, perhaps a method like the first example in http://stackoverflow.com/a/14300729/272387 is helpful.

it might be worth making "shutdown timeout" configurable, too.