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JBoss 4.2.3 class loading sequence

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Hi every body.
I have an application which contains same jar file's with different version... and those jar are my applicaition specific...

Like base.jar which is my applications model module jar files..
There are 3 version of it.

Like base-1.0.jar, which is the initial one,

base-2.0.jar which is later contains some files which are already there in base-1.0.jar but modified....

and last base-sp.jar which is appliaction specific jar file...

what i want to do is.... my war file contians base-sp.jar........ in web-inf/lib

this jar file should be ovverriden by base-2.0.jar and
base-2.0.jar should ovverride base-1.0.jar..

while loading the classes................

when application is running...... class loader should first look into base-spec.jar for the class if it is not found then should look into base-2.0.jar and it doesnt find it their then it should go to base-1.0.jar

Kindly any help me to achive this....

Thanks in Advance,
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