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copied!<p>As the location and name of the file differs between platforms and it seems there is no environment variable pointing to it I suppose that your best bet is to look for the file in the filesystem:</p> <pre><code>#!/usr/bin/env python import subprocess import re rtjarPaths = subprocess.check_output(["locate", "rt.jar"]) paths = re.findall('^.*/jre/.*$', rtjarPaths, re.M) print paths vicent@deckard:~$ python findrt.py ['/usr/lib/jvm/java-6-openjdk/jre/lib/rt.jar'] </code></pre> <p>The above code works fine for me on my Ubuntu box. It can be easily extended for working on MacOS X too. Other linux distros may require to adapt the code too.</p> <p><strong>Update:</strong> After some googling I've found <a href="http://docs.oracle.com/javase/6/docs/technotes/tools/findingclasses.html" rel="nofollow">in the oracle documentation</a> that the <code>rt.jar</code> file is located in the path stored in the <code>sun.boot.class.path</code> system property. Unfortunately I don't know how to get this property directly from Python or from the command line so I can only provide the following dirty alternative to the previous code.</p> <p>Create and compile PropertiesTest.java:</p> <pre><code>public class PropertiesTest { public static void main(String[] args) throws Exception { String value = System.getProperty("sun.boot.class.path"); System.out.println(value); } } </code></pre> <p>Then execute the following Python script:</p> <pre><code>#!/usr/bin/env python import subprocess import re jrePaths = subprocess.check_output(["java", "PropertiesTest"]) rt = re.findall('(?:.*:)?(.*/(?:rt|classes)\.jar):?', jrePaths) print rt </code></pre> <p>which should work on both Linux and MacOS X platforms. On my Ubuntu system it gives the output </p> <pre><code>['/usr/lib/jvm/java-6-openjdk/jre/lib/rt.jar'] </code></pre>

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