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Jar Locking

Jar Locking

2006-09-02       - By Stephen McConnell
Reply:     <<     11  



> -----Original Message-----
> From: Steve Loughran [mailto:stevel@(protected)]
> Sent: Friday, 1 September 2006 8:32 PM
> To: Ant Users List
> Subject: Re: Jar Locking
>
> Stephen McConnell wrote:
> >  
> >
> >> -----Original Message-----
> >> From: Marc Farrow [mailto:marc.farrow@(protected)]
> >> Sent: Friday, 1 September 2006 2:35 AM
> >> To: Ant Users List
> >> Subject: Re: Jar Locking
> >>
> >> Thanks Stephen.  If I set all references to Ant to null and forced
> >> GC, would that resolve the problem?
> >
> > Well, umm, this is tricky.  If your loading a task or data type
> > definition I think Ant holds a strong reference to the class which
> > would suggest that setting things to null would not change (because
> > strong references are held for the life of the JVM).  I may
> be wrong
> > here because it's been a while since I dug into Ant
> internals on task
> > class references - but one of the Ant Developers could
> probably confirm things.
> >
> > However, if your running Ant as an embedded solution - then in
> > principal the disposal of the Ant project would clear any task and
> > datatype references and you may have a chance.  But this is tricky
> > stuff and getting it right really requires that the Ant project and
> > all Ant related stuff is loaded in a child classloader
> relative to the
> > launching application (i.e. it's the classloader disposal
> that is key to the releasing of the file reference).
> >
> > It is possible - but it's not trivial.
> >
> > Cheers, Steve.
>
> Isnt it the case that if you hold any class created by a
> classloader, there is reference to the classloader? because I
> can always go object.getClass().getClassloader()

Correct.

>
> you'd need to forget about every object created and returned
> by ant itself

Yep. Which is when a plugin management framework comes in real handy.
/Steve.

--------------------------
Stephen McConnell
mailto:mcconnell@(protected)
http://www.dpml.net


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