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copied!<p>Here's a more complete way to solve this for jars, based on the idea posted by JG.</p> <pre><code>/** * Scans all classloaders for the current thread for loaded jars, and then scans * each jar for the package name in question, listing all classes directly under * the package name in question. Assumes directory structure in jar file and class * package naming follow java conventions (i.e. com.example.test.MyTest would be in * /com/example/test/MyTest.class) */ public Collection<Class> getClassesForPackage(String packageName) throws Exception { String packagePath = packageName.replace(".", "/"); ClassLoader classLoader = Thread.currentThread().getContextClassLoader(); Set<URL> jarUrls = new HashSet<URL>(); while (classLoader != null) { if (classLoader instanceof URLClassLoader) for (URL url : ((URLClassLoader) classLoader).getURLs()) if (url.getFile().endsWith(".jar") // may want better way to detect jar files jarUrls.add(url); classLoader = classLoader.getParent(); } Set<Class> classes = new HashSet<Class>(); for (URL url : jarUrls) { JarInputStream stream = new JarInputStream(url.openStream()); // may want better way to open url connections JarEntry entry = stream.getNextJarEntry(); while (entry != null) { String name = entry.getName(); int i = name.lastIndexOf("/"); if (i > 0 && name.endsWith(".class") && name.substring(0, i).equals(packagePath)) classes.add(Class.forName(name.substring(0, name.length() - 6).replace("/", "."))); entry = stream.getNextJarEntry(); } stream.close(); } return classes; } </code></pre>

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