Jar/ java files in APPs

Hi,
Could anybody explain me where (in which directories) jar/ java files are situated in APPs and which is the difference between the jar files situated in COMMON_TOP and APPL_TOP ?
Thanks,
Paul

sorry, maybe i didn't state this clearly enough. basically, i have sets of libraries: app server library and middle-tier client libraries these are installed with each client machine and need to be updated accordingly with the libraries resided in the weblogic app server. now, the way i update these libraries is to uninstall/reinstall the client app each time. i am looking for ways to update in 1 place, ideally in the weblogic app server, then each time the client app starts, it will be notifed of these updates and maybe download these updates from the app server automatically...This will save me the hassle to uninstall/reinstall the client app each time, even small changes in the interfaces...

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You can study this.
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801283 wrote:
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However the only solution I tried was to open the JAR file in winrar and see that its made up of png picture files,
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Jar/ java files in APPs

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