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    <p>The way to handle this would be to register a <a href="http://java.sun.com/javase/6/docs/api/java/lang/Runtime.html#addShutdownHook%28java.lang.Thread%29" rel="noreferrer">shutdown</a> hook. If you use (<strong>SIGINT</strong>) <code>kill -2</code> will cause the program to gracefully exit and run the shutdown hooks.</p> <blockquote> <p>Registers a new virtual-machine shutdown hook.</p> <p>The Java virtual machine shuts down in response to two kinds of events:</p> <ul> <li><p>The program exits normally, when the last non-daemon thread exits or when the exit (equivalently, System.exit) method is invoked, or</p></li> <li><p>The virtual machine is terminated in response to a user interrupt, such as typing ^C, or a system-wide event, such as user logoff or system shutdown.</p></li> </ul> </blockquote> <p>I tried the following test program on OSX 10.6.3 and on <code>kill -9</code> it did <strong>NOT</strong> run the shutdown hook, didn't think it would. On a <code>kill -15</code> it <strong>DOES</strong> run the shutdown hook every time.</p> <pre><code>public class TestShutdownHook { public static void main(final String[] args) throws InterruptedException { Runtime.getRuntime().addShutdownHook(new Thread() { @Override public void run() { System.out.println("Shutdown hook ran!"); } }); while (true) { Thread.sleep(1000); } } } </code></pre> <p>This is the documented way to write your own <a href="http://www.google.com/search?hl=en&amp;q=sun.misc.signalhandler" rel="noreferrer">signal handlers</a> that aren't shutdown hooks in Java. Be <a href="http://java.sun.com/products/jdk/faq/faq-sun-packages.html" rel="noreferrer">warned</a> that the <code>com.sun.misc</code> packages and are un-supported and may be changed or go away at any time and probably only exist in the Sun JVM.</p>
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    1. CO`SIGKILL` (9) is a non catchable signal. That's a Unix design feature.
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    2. COThe `Runtime` class is `java.lang.Runtime` and exists since JDK 1.0. The `addShutdownHook` method exists [since 1.3](http://docs.oracle.com/javase/1.3/docs/api/java/lang/Runtime.html#addShutdownHook%28java.lang.Thread%29). So you can safely rely on them.
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    3. CO@dolmen read for comprehension, I am warning about the `com.sun` packages, that are mentioned in the question as to not be used.
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