How to identify un-used jars?

Hi,
My application is built on top of some third party distribution -- I put all the jars found in the 3rd party lib in the classpath of my application project, and in my distribution zip. Of these jars:
- Some jar contains classes that are imported in my application, so my app
directly uses this jar;
- Some jar contains classes used by other classe that live in a different jar and are
import in my application, so my app indirectly uses this jar;
- Yet some jar contains classes that are not used by my app, directly or indirectly.
I wonder if there's some technique or technology that helps identifying the jars of the above third category? I tried into something like class loader but haven't seemed to find a solution yet.
Any help?
Appreciatively,

Monitoring is more used for index. But it is also
available for tables.
Auditing can be also a good alternative.
Thanks.Please provide your claim with support.
The monitoring clause is used on table for different purpose than monitoring usage on index.
http://download.oracle.com/docs/cd/B19306_01/server.102/b14231/tables.htm#sthref2273
Quote "
Formerly, you enabled DBMS_STATS to automatically gather statistics for a table by specifying the MONITORING keyword in the CREATE (or ALTER) TABLE statement. Starting with Oracle Database 10g, the MONITORING and NOMONITORING keywords have been deprecated and statistics are collected automatically. If you do specify these keywords, they are ignored. "
OP is using 10gR2

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