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    <p>You could use <a href="https://web.archive.org/web/20090227113602/http://snippets.dzone.com:80/posts/show/4831" rel="noreferrer">this method</a><sup>1</sup> that uses the <code>ClassLoader</code>.</p> <pre><code> /** * Scans all classes accessible from the context class loader which belong to the given package and subpackages. * * @param packageName The base package * @return The classes * @throws ClassNotFoundException * @throws IOException */ private static Class[] getClasses(String packageName) throws ClassNotFoundException, IOException { ClassLoader classLoader = Thread.currentThread().getContextClassLoader(); assert classLoader != null; String path = packageName.replace('.', '/'); Enumeration&lt;URL&gt; resources = classLoader.getResources(path); List&lt;File&gt; dirs = new ArrayList&lt;File&gt;(); while (resources.hasMoreElements()) { URL resource = resources.nextElement(); dirs.add(new File(resource.getFile())); } ArrayList&lt;Class&gt; classes = new ArrayList&lt;Class&gt;(); for (File directory : dirs) { classes.addAll(findClasses(directory, packageName)); } return classes.toArray(new Class[classes.size()]); } /** * Recursive method used to find all classes in a given directory and subdirs. * * @param directory The base directory * @param packageName The package name for classes found inside the base directory * @return The classes * @throws ClassNotFoundException */ private static List&lt;Class&gt; findClasses(File directory, String packageName) throws ClassNotFoundException { List&lt;Class&gt; classes = new ArrayList&lt;Class&gt;(); if (!directory.exists()) { return classes; } File[] files = directory.listFiles(); for (File file : files) { if (file.isDirectory()) { assert !file.getName().contains("."); classes.addAll(findClasses(file, packageName + "." + file.getName())); } else if (file.getName().endsWith(".class")) { classes.add(Class.forName(packageName + '.' + file.getName().substring(0, file.getName().length() - 6))); } } return classes; } </code></pre> <p>__________<br> <sub><sup>1</sup> This method was taken originally from <a href="http://snippets.dzone.com/posts/show/4831" rel="noreferrer">http://snippets.dzone.com/posts/show/4831</a>, which was <a href="https://web.archive.org/web/20090227113602/http://snippets.dzone.com:80/posts/show/4831" rel="noreferrer">archived</a> by the Internet Archive, as linked to now. The snippet is also available at <a href="https://dzone.com/articles/get-all-classes-within-package" rel="noreferrer">https://dzone.com/articles/get-all-classes-within-package</a>.</sub></p>
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    1. POCan you find all classes in a package using reflection?
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    1. COI had a problem with this if my path included spaces. The URL class was escaping spaces to `%20`, but the `new File()` constructor treated that as a literal percent sign two zero. I fixed it by changing the `dirs.add(...)` line to this: `dirs.add(new File(resource.toURI()));` This also meant I had to add `URISyntaxException` to the throws clause of `getClasses`
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    2. COThis also doesn't work if the classes are inside of a Jar.
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