[kepler-dev] what's the deal with org.kepler.loader.InitClassPath?

Daniel Crawl crawl at sdsc.edu
Sat Nov 1 14:17:31 PDT 2008

Hi Tristan,

I've updated InitClassPath to no longer go into the .svn


Chad Berkley wrote:
> Hi Tristan,
> I think this class is there so that the classpath can be amended to 
> allow for different versions of the same class in different jars.  I 
> think Dan Crawl last worked on it, so I'll let him explain more.  I 
> think it's a bug that it finds files in the .svn directories.  They 
> should probably be explicitly excluded from the search as we will 
> never want anything in those directories in the classpath.
> We have plans to overhaul this system sometime in the next year when 
> we start re-architecting the core of kepler.
> As for including all of jython in kepler, I don't have a problem with 
> that as long as it isn't 20 MB of jar files or something huge like 
> that.  We're in the process of breaking kepler up into modules which 
> will be built by a single build system.  A Jython module would 
> probably be a nice addition to kepler.  I'm hoping to have the new 
> directory structure for the modules sorted out in the next week or so 
> and I'm almost at a point where I can check in the changes that I've 
> made to split the core of kepler away from other functionality.  
> Needless to say, there are some pretty large changes coming to Kepler 
> in the next couple weeks. You might want to wait just a bit until we 
> get this new system in place before adding Jython.  We'll make an 
> announcement to the community when everything is ready to go.
> thanks,
> chad
> Tristan King wrote:
>> I've been messing around with kepler's jython support recently trying 
>> to get kepler to use my system's jython install rather than the 
>> jython.jar included with kepler and run into an interesting problem.
>> The InitClassPath class recursively goes through the lib/jar/ 
>> directory and adds anything it finds to the classpath. This includes 
>> the .svn/**/*.jar.svn-base files. Thus, even if i overwrite the 
>> lib/jar/jython.jar file, the 
>> lib/jar/.svn/prop-base/jython.jar.svn-base file is found and added to 
>> the classpath, and since . comes before j, the .svn/ version of 
>> jython.jar takes precedence in the classpath. I haven't tested this, 
>> but assume that this would effect any other files in the lib/jar/ 
>> directory. If you try and update a library, you wont be able to test 
>> it until you check the file into svn, which overwrites the stored 
>> .svn version of the file.
>> Is there any advantage to the InitClassPath class other than removing 
>> the need to write out the classpath manually in release builds? 
>> Because I can't see one, and I don't think the aforementioned reason 
>> is a good reason for trying to build something that ant provides 
>> already, and does right!
>> -- 
>> Tristan King
>> Research Officer,
>> eResearch Centre
>> James Cook University, Townsville Qld 4811
>> Australia
>> Phone: +61747816902
>> E-mail: tristan.king at jcu.edu.au <mailto:tristan.king at jcu.edu.au> www: 
>> http://eresearch.jcu.edu.au
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