Classpath classloader relative urls etc

hi,
i dont think i really understand all this classloader type stuff, and wonder if someone could tell me what i'm missing.
i have an app with this directory structure:
-appdir
    -lib
        app.jar
        someotherjars.jar
    -data
        propertiesfilemy classpath is just the jars in the lib folder. i want to read/write to the propertiesfile in the data directory. ideally via a relative path based on the lib directory. i don't want to use the user.dir system property cos that could be anywhere. i've tried all sorts of things to do with classloaders/getResource/getSystemResource etc, but all i get is null. is it possible to do this with a relative path?
thanks for any help!

hmm, still confused!
if i add appdir/data to my classpath and do this:
this.getClass().getResource("propertiesfile");i still get null. but if i do:
this.getClass().getClassLoader().getSystemResource("propertiesfile");i get the file, hooray!
BUT...
i don't really want appdir/data in my classpath (theres also a logs directory etc, really want to do it relative to the lib dir, or the appdir) if i add just appdir to the classpath its ok, this works:
this.getClass().getClassLoader().getSystemResource("data/propertiesfile");but if i just add the lib dir to the classpath and do this:
this.getClass().getClassLoader().getSystemResource("../data/propertiesfile");it doesn't. i can't really see why...
cheers anyway, at least i know i can get at my file now, thaks for the help!
ps err, anorak, hmm, how to explain that one? :) i guess its just another way of saying slightly nerdy really, i.e. people most likely to be seen wearing an anorak = computer nerds/trainspotters (not that i am either, honest, neither do i wear one...). british humour?? :)

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null

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Rick Post:
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<HR></BLOCKQUOTE>
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Classpath classloader relative urls etc

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