Re: [equinox-dev] ClassLoader deadlock issues

["Kirby Bohling" <computerslicer23@xxxxxxxxxxx>]

Pascal,

Any chance you can point me at documentation about the extension 
registration (is that Extension points, or do you mean something at the OSGi 
bundle level?) and services (that I'm pretty sure is an OSGi thing)?  I've 
poked around a bit and have found myself wanting for better documentation.  
Ultimately, I do have corners I'll get stuck in, like Serialization for 
remote messaging.  I'll see if I can get around that.

One of the design constraints, is that I can't be tied to Eclipse.  I am 
part of the tools team at my work, and the tools have to work both inside 
and outside of Eclipse.  So while aspects of it support Eclipse well, I've 
been working hard to ensure that they work just fine standalone in SWT 
applications.

  Kirby

> From: Pascal Rapicault <Pascal_Rapicault@xxxxxxxxxx>
> Reply-To: Equinox development mailing list <equinox-dev@xxxxxxxxxxx>
> To: Equinox development mailing list <equinox-dev@xxxxxxxxxxx>
> CC: equinox-dev@xxxxxxxxxxx, equinox-dev-bounces@xxxxxxxxxxx
> Subject: Re: [equinox-dev] ClassLoader deadlock issues
> Date: Fri, 13 Oct 2006 19:58:39 -0400
>
> Kirby,
>
> If you are the author of the main and children plug-ins, you should not be
> using BuddyLoading as your pluggability mechanism and should instead use
> the extension registry or services.
> BuddyLoading has been designed to help people integrate libraries that use
> reflection and context classloaders as their extension mechanism and they
> can't change the code.
>
> HTH,
>
> PaScaL
>
>
>
>
> "Kirby Bohling" <computerslicer23@xxxxxxxxxxx>
> Sent by: equinox-dev-bounces@xxxxxxxxxxx
> 10/13/2006 05:10 PM
> Please respond to
> Equinox development mailing list <equinox-dev@xxxxxxxxxxx>
>
>
> To
> equinox-dev@xxxxxxxxxxx
> cc
>
> Subject
> [equinox-dev] ClassLoader deadlock issues
>
>
>
>
>
>
> All,
>
> I've been working with Eclipse, and use Buddy Loaders fairly extensively
> so
> that core plug-ins can construct objects from their child plug-ins at
> runtime.
>
> The ClassLoader segmentation is causing me lots and lots of issues w/
> BuddyLoaders and the deadlock.
>
> I've seen this thread:
> http://dev.eclipse.org/mhonarc/lists/equinox-dev/msg01354.html
>
> This pretty much exactly covers my case.  Are there any workarounds or
> mitigations?  I use object serialization for over the wire communication
> and
> spring both of which use Global buddy loaders.  Currently my application
> deadlocks 9 times out of 10.
>
> I've been looking into writing my own classloader to deal with the issue.
> That hasn't gotten me very far (I've inserted my own classloader that
> forces
> all class loads to happen on a single threading context, but it's so slow
> I
> haven't bothered to test it with my real application).  Are the any fixes
> or
> work arounds?  Any guidelines I can follow to mitigate the problem.  A lot
>
> the time my application is completely assembled at runtime via reflection.
>
>     Thanks,
>         Kirby
>
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