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From Matt Benson <gudnabr...@yahoo.com>
Subject Re: "destroy"-ing an Ant exec doesn't destroy what Ant is "exec"-ing...
Date Mon, 07 Apr 2003 15:30:52 GMT
They do not call Ant's main; rather they imitate what
it does without calling System.exit().  Another
(wrong) way to do it is to install a SecurityManager
that does not permit System.exit() to be called, call
main and catch the SecurityException.

-Matt

--- Rich Wagner <richmwagner@hotmail.com> wrote:
> Stefan:  Thanks for the reply.  I (obviously) wasn't
> familiar with shutdown 
> hooks, so I'll probably look at the Ant source, both
> for that shutdown code 
> (to see how it works) and at Main, for potential
> cloning.
> 
> I did consider, though, not "exec"-ing Ant in its
> own VM, and instead 
> calling its "main" directly.  But I'm concerned that
> whether I call "main" 
> or a clone that my GUI front end for Ant will
> inherit what seems to be a 
> problem in Ant itself.  That is, if a build file
> uses a "<java>" task that 
> does *NOT* fork, then if that "<java>" program calls
> "System.exit()", it 
> causes Ant to exit !  (Whether Ant had other
> targets/tasks to complete or 
> not...)
> 
> My GUI spawns an "exec"-ed Ant Process each time one
> of the GUI's buttons is 
> pressed: that way, even it a single Ant invocation
> dies (because a "<java>" 
> task "System.exit"s and kills Ant in the process),
> at least my GUI sticks 
> around.  If I switched to running my GUI in the same
> VM as Ant, then a 
> "<java>" task's "System.exit" would kill my GUI
> too...
> 
> >Most Ant IDE integrations do not execute Ant in a
> separate VM.  You
> >may be able to get some ideas of the Open Source
> versions of existing
> >IDE integrations (NetBeans, Eclipse, the JBuilder
> AntRunner and
> >probably others are Open Source).
> 
> Do you know whether these IDE front ends have to
> work-around this 
> "<java>"/System.exit problem, and if so, how ?
> 
> -- Rich Wagner
> 
> 
> >From: Stefan Bodewig <bodewig@apache.org>
> >Reply-To: "Ant Users List" <user@ant.apache.org>
> >To: user@ant.apache.org
> >Subject: Re: "destroy"-ing an Ant exec doesn't
> destroy what Ant is 
> >"exec"-ing...
> >Date: 07 Apr 2003 10:05:15 +0200
> >
> >On Mon, 07 Apr 2003, Rich Wagner
> <richmwagner@hotmail.com> wrote:
> >
> > > If I hit the "Stop" button while my Ant build
> file is in the middle
> > > of "exec"-ing that "build.exe" sub-Process, the
> "destroy" call
> > > *DOES* kill Ant, but Ant does not - in turn -
> "destroy" the
> > > "build.exe" sub-process.
> >
> >Ant will try to kill the spawned processes in it's
> shutdown hook
> >(given a Java VM recent enough to support shutdown
> hooks and Ant >=
> >1.5 that is).
> >
> >I've found that at least on Unix shutdown hooks
> will not be called by
> >the VM if you kill the spawned process with enough
> violence (i.e.
> >kill -9 doesn't, a simple kill usually does).
> >
> >If Ant's VM has no chance to call the shutdown
> hooks, there probably
> >isn't anything you can do.
> >
> > > Anyway, details aside, is there maybe a
> different way (other than
> > > "exec") that I can run "Ant"
> >
> >Sure.  Look what Main does and clone it (don't use
> Main directly, its
> >not suitable for that).
> >
> >
> >Stefan
> >
>
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