Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!us.feeder.erje.net!news2.arglkargh.de!news.swapon.de!eternal-september.org!feeder.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: Knute Johnson Newsgroups: comp.lang.java.programmer Subject: Re: refusal to quit Date: Fri, 29 Aug 2014 17:25:36 -0700 Organization: A noiseless patient Spider Lines: 23 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Injection-Date: Sat, 30 Aug 2014 00:25:34 +0000 (UTC) Injection-Info: mx05.eternal-september.org; posting-host="aba33539224e5c782fe0c4053f7756fd"; logging-data="19264"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1/50QsWVg5wxIOifYXaXkvP" User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.0 In-Reply-To: Cancel-Lock: sha1:o3akXxboZ5FI1Eu/mhHsvlDfYxk= Xref: csiph.com comp.lang.java.programmer:29872 On 8/29/2014 09:56, 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? > Timers, Threads (even daemon threads sometimes although they aren't supposed to stop shutdown), EDT held on undisposed JFrames or JDialogs. Sometimes finding them all can be a pain. I pretty much don't use System.exit anymore so that I'm forced to find all the running things and shut them off so the program will quit. -- Knute Johnson