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From Steve Loughran <>
Subject Re: ClasspathUtils with or vs. JavaResource
Date Wed, 16 Jan 2008 16:03:01 GMT
jonathan doklovic wrote:
> Hey,
> I've been working on refactoring some code to make it easier to
> implement relative resources in things like the import task.
> After looking at BaseDef and AntLibDefinition, it seemed that it was a
> bit backwards and AntlibDefinition should actually extend a base class
> that provides basic classpath lookups.
> In trying to do this refactoring, I realized that all of this stuff was
> just using ClasspathUtils and not using JavaResource or
> ClasspathResource so I figured the refactoring should include this
> update as well.
> However, after digging in, it seems to get very complex...
> ClasspathUtils (and it's Delegate) does a lot of work to figure out the
> classloader and reuse one if it can.  To do this, there's a bunch of
> delegate calls that get made and eventually the calling task takes the
> class loader returned by the delegate and loads the resource (unless
> it's a file, then it just loads it).
> With a ClasspathResource, you basically give it the path and the
> resource name, and it does it's own simpler checks to figure out and
> reuse the classloader and you can tell it to load the resource. However,
> you cannot get a reference to the classloader used.
> My question is, should these be used together?  It seems a little
> overkill to do all the steps required in ClasspathUtils just to get the
> path for the resource to then in turn pass it to a ClasspathResource
> which is going to use it's own classloader anyway.
> There's got to be a cleaner way to do this, i'm just not sure if
> ClasspathUtils should be updated to return/use ClasspathResources, or if
> the ClasspathResource should get a little smarter to bypass the utils
> class alltogether.
> any thoughts?
> - Jonathan 

the two goals of ant's classpath work are

(a) reuse stuff so that you can share data properly
(b) not leak like a leaky-sieve, and so cause IDEs or app servers to run 
out of memory

The classpath stuff does achieve both, but I'd have to look at all of 
this to see what is going on. You are clearly provoking us into a code 

Steve Loughran        
Author: Ant in Action 

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