public static String[] getClasses(String pckgname) {
		try {
			java.util.ArrayList<String> classes = new java.util.ArrayList<String>();
			// Get a File object for the package
			File directory = null;
			try {
				ClassLoader cld = Thread.currentThread().getContextClassLoader();
				if (cld == null) {
					throw new ClassNotFoundException("Can't get class loader.");
				}
				String path = pckgname.replace('.', '/');
				URL resource = cld.getResource(path);
				if (resource == null) {
					throw new ClassNotFoundException("No resource for " + path);
				}
				directory = new File(resource.getFile());
			} catch (NullPointerException x) {
				throw new ClassNotFoundException(pckgname + " (" + directory
						+ ") does not appear to be a valid package");
			}
			if (directory.exists()) {
				// Get the list of the files contained in the package
				String[] files = directory.list();
				for (int i = 0; i < files.length; i++) {
					// we are only interested in .class files
					if (files[i].endsWith(".class")&&!findText(files[i],"$")) {
						// removes the .class extension
						classes.add(files[i].substring(0,files[i].length()-6));
	//					classes.add(Class.forName(pckgname + '.'
	//							+ files[i].substring(0, files[i].length() - 6)));
					}
				}
			} else {
				throw new ClassNotFoundException(pckgname
						+ " does not appear to be a valid package");
			}
			String[] classesA = new String[classes.size()];
			classes.toArray(classesA);
			return classesA;
		}catch(Exception e) {
			e.printStackTrace();
			return null;
		}
	}