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POPrevent System/exit in code I don't have access to
 

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    <p>I'm playing with someone else's code by examining it in the repl.</p> <p>It keeps calling System/exit, which brings down my repl. This is infuriating.</p> <p>In all the code I have access to, I've mocked the calls out.</p> <p>But it's also calling some library code I don't have the source to, both java and clojure, and this occasionally causes exits too.</p> <p>Is there any way to catch these calls globally, so that an attempt to call them doesn't kill the repl thread? Ideally it would just throw an exception instead.</p> <p>I think in java I could install a new SecurityManager to get this effect, but I've never done it</p> <p>there seems to be something in that line here: <a href="http://jroller.com/ethdsy/entry/disabling_system_exit" rel="nofollow">http://jroller.com/ethdsy/entry/disabling_system_exit</a></p> <p>So I'm thinking something like:</p> <pre><code>(System/setSecurityManager (SecurityManager.)) </code></pre> <p>only I somehow need to attach</p> <pre><code> public void checkPermission( Permission permission ) { if( "exitVM".equals( permission.getName() ) ) { throw new ExitTrappedException() ; } } </code></pre> <p>My best shot so far is:</p> <pre><code>(System/setSecurityManager (proxy [SecurityManager] [] (checkPermission [p] (when (= "exitVM" (.getName p)) (throw (Exception. "exit")))))) </code></pre> <p>or maybe</p> <pre><code>(System/setSecurityManager (proxy [SecurityManager] [] (checkExit [n] false))) </code></pre> <p>But they both just destroy the repl</p> <p>Or is there a better way of doing this?</p>
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    1. USJohn Lawrence Aspden
    1. USJohn Lawrence Aspden
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    1. COYour "best shot" works for me: (System/exit) causes a java.security.AccessControlException. I'm on Mac OS X 10.6.6, Java 1.6.0_22, Clojure 1.2.
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      1. USJouni K. Seppänen
    2. COIt seems to disallow everything, though. My swank repl just collapses and needs to be restarted.
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      1. USJohn Lawrence Aspden
 

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