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https://issues.apache.org/jira/browse/LUCENE-4352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13447236#comment-13447236
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Uwe Schindler commented on LUCENE-4352:
---------------------------------------

The problem is, thats not easy possible with a policy file, as we can only 
forbid it globally or allow it. If we would have signed code (means the JAR 
file of the test-runner is signed by Verisign or like that, you can allow it 
selectively for specific signers), or by directory (must be absolute URL - 
e.g., with file:/fullpath/...). This would need tpo be preprocessed by the 
build.xml to make absolute and convert to URL/URI (new 
File(...).asURI().toAsciiString()).

The question: Does the test runner call System.exit() at all or does it just 
let the main() method finish? If the latter is true, then its easy, just 
disallow System.exit().
                
> only the test runner should be able to System.exit
> --------------------------------------------------
>
>                 Key: LUCENE-4352
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4352
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Robert Muir
>
> All others should get SecurityException

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