Denying system.exit in java code

My objective is to nullifying the system.exit programmed. By goggling i learn t that this can be done by adding permission in policy file. But as far my google search i dont understand how to deny a permission. Most of them says about granting a permission. Can anyone clarify how to deny a permission.
Steps i tried.
Sample program: which does nothing other than calling system.exit(0) as the first line in main method.
added the following line to java.policy file in my JAVA_HOME/jre/lib/security
grant {
permission java.lang.RuntimePermission "exitVM";
Also tried adding only
permission java.lang.RuntimePermission "exitVM";
to the already available grant block.
Also commented out
//grant codeBase "file:${java.home}/lib/ext/*" {
// permission java.security.AllPermission;
After that i understood that the default java policy file is java.home\lib\security\java.policy. So made all the change above mentioned there too.
But i could not achieve it. Can any one help me on this.
Win 2000/ Java1.4.2_12/no command line arguments while running the program.

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