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    <blockquote> <p>Conceptually, what am I doing when I'm loading a new Jar?</p> </blockquote> <p>Conceptually, you are not loading a new JAR. Rather, you are defining a class loader which will load code and other resources from the JAR file on demand.</p> <blockquote> <p>Is URLClassloader the only choice? </p> </blockquote> <p>In theory, you could implement your own subclass of <code>ClassLoader</code>, but that's not necessary for what you are trying to do.</p> <blockquote> <p>How should I form those URLs to point to a subdirectory containing more jars.</p> </blockquote> <p>This is the nub of your problem I think. The <a href="http://java.sun.com/javase/6/docs/api/java/net/URLClassLoader.html" rel="nofollow noreferrer"><code>URLClassLoader</code></a> constructors interpret the <code>URL[]</code> argument as follows:</p> <blockquote> <p><em>"Any URL that ends with a '/' is assumed to refer to a directory. Otherwise, the URL is assumed to refer to a JAR file which will be downloaded and opened as needed."</em></p> </blockquote> <p>In the first case of the quoted text above, the directory is assumed to be the root of tree containing resources to be loaded. </p> <p>But I gather you are trying to set up a class loader that will load from all JAR files in a given directory. To do that, you need to:</p> <ol> <li>Read the directory and build a list of the <code>File</code> objects for any JAR files.</li> <li>Create an array to hold the same number of <code>URL</code> instances.</li> <li>For each JAR file <code>File</code>, use <code>File.toURL()</code> to create a <code>URL</code> and add to the array. (Using <code>File.toURL()</code> means that you will get kosher "file:" URLs for the JAR files that will work on your platform.)</li> <li>Create the <code>URLClassLoader</code> using the <code>URL</code> array.</li> </ol>
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