Location of a jar file

I need to reference a class in my application named BiarOutput. According to the following link --  http://diamond.businessobjects.com/node/6423 it should be inside a package com.businessobjects.sdk.biar. Where can I find the jar that holds this package?
Although I found a jar named Biarengine.jar under "BusinessObjects Enterprise 11.5\Web Services\en\dsws_webservice_boe\data\Assemble\dswsBobjeJava\src\WEB-INF\lib " that has the same package structure but only one class that is BiarFactory.
I am using BO XI R2 with SP2.
Please tell me what i am missing here?
Thanks,
Sukalpo

How can I find the absolute path to a jar file's
location, using only code inside the jar file? (and
do this on any OS).
I am trying to open a file that is in the same folder
as the jar file. The problem is that the jar file can
be deployed to any folder, the working dir is not the
same dir as the jar file.
I have been trying this:
Class c = this.getClass();
Try the following instead: c.getProtectionDomain().getCodeSource().getLocation()

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