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From: Josip Almasi <joe@vrspace.org>
Newsgroups: comp.lang.java.programmer
Subject: Re: refusal to quit
Date: Fri, 29 Aug 2014 22:16:03 +0200
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On 08/29/2014 06:56 PM, Roedy Green wrote:
> Sometimes programs simply refuse to quit after main has terminated.
>
> Sometimes the app is single-thread so I am baffled what it is waiting
> for.
>
> Practically I can make things work by adding a System.exit(0)
> as the last thing in main.
>
> However, I would like to understand what is going on.  Is there a way
> to shed some light on why a program won't quit?

Yep, start jconsole and inspect threads, there must be some running, 
started implicitly by some lib.

Regards...