i was wondering if there is a way to validate xslt stylesheets
somehow? (would be cool if there would be a way with java).

i searched with google already, but didnt find anything.

Well, you didn't say against what do you want to validate.
Take a look at schematron[1] - its reference implementation is in XSLT.

[1] http://www.ascc.net/xml/resource/schematron/schematron.htm
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Oleg Tkachenko
Multiconn Technologies, Israel