how to find the path for default pdf reader in ubuntu10.10?

i want to give path of document viewer ,which is a default pdf reader with ubunutu10.10 in my java app...

i tried to find the path of app using

$ which documentviewer

on command prompt..but got no result...

Any help is apprecia开发者_Go百科ted..

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Then binary is called evince, as that's the product name. "Document viewer" is just the generic term.

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It's called evince:

$ which evince
/usr/bin/evince