Need reviewer for 6902010: (cl) Delay initialization of ClassLoader.parallelLoaders

Mandy Chung Mandy.Chung at Sun.COM
Wed Nov 18 17:19:14 UTC 2009

Looks good.  I reviewed your latest webrev that incorporated Rémi's 


Alan Bateman wrote:
> Valerie,
> I'd like to re-visit the initialization of the parallel-capable 
> loaders [1]. Currently the set of parallel-capable loader types is 
> created by ClassLoader's initializer. That works today but is a bit 
> fragile in that any changes or fixes that cause ClassLoader to be 
> initialized earlier in the VM startup could cause problems. For 
> example, if ClassLoader were to be initialized earlier then adding the 
> initial element will cause a weak reference to be created and that 
> will NPE in the Reference's initializer as the main thread isn't in a 
> thread group at that point. All code that executes before the system 
> classes are fully initialized requires great care so for this one, I 
> think the simplest thing would be to delay the initialization unless 
> the first loader is created. Does that seem reasonable? I've put a 
> webrev with the proposed changes here:
> For testing, I've been using the tests in 
> test/java/lang/ClassLoader/deadlock.
> Thanks,
> Alan.
> [1]

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