How to restrict rights of executed program

Greetings,
I need to execute JAVA programs (student homework), where there is not guaranteed that one of the submission is some kind of trojan horse, which could potentially e.g. delete some important files on a machine, which executes the code.
Is there any simple way how to restrict rights of executed program?
Or how does e.g. tomcat hosting provider guarantee the security?
Thanks in advance.
Edited by: radone on Jun 29, 2008 10:59 PM

Nice example describing using a policy management is here:
[Managing Policy Files|http://exampledepot.com/egs/java.security/UsePolicy.html]
Edited by: radone on Jun 30, 2008 1:50 AM

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