Custom Jar creation for SIM customizations

Hi,
Can anyone tell me how to create a custom jar for SIM customizations
( which has been done by using extension methodology ) and where to put it so the custom code is picked up first rather than the base code.
Thanks,
Susmita

sim-1311-impg1.pdf says:
Build/Packaging/Deployment Related
To build and deploy the customizations correctly, make a separate project for
custom-modified code. Make sure any existing Java files that are going to be altered
have the exact same class structure as the base code within this new project. New or
additional Java files might have a class structure that makes sense for the new code.
Build a custom JAR with the modified or newly created code. This custom JAR should
be placed first in the execution classpath so that classes found within the JAR are
chosen by the JVM rather than the base classes. This will require unsigning and
resigning all the JARs in the SIM-client application, since all JARs must be signed with
the same signature for Web Start to work correctly. Consult the jarsigner
documentation from Sun for further information on the JAR unsigning/signing
process.
Hope this helps,
Best regards,
Erik Ykema

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