public boolean loadClasses(String file) {
        classes = new HashMap<String, ClassGen>(0);
        try {
            JarFile jar = new JarFile(file);
            Enumeration<JarEntry> entries = jar.entries();

            while (entries.hasMoreElements()) {
                JarEntry entry = entries.nextElement();
                if (!entry.getName().endsWith(".class"))
                    continue;

                JavaClass clazz = new ClassParser(jar.getInputStream(entry), entry.getName().replace(".class", "")).parse();
                classes.put(clazz.getClassName(), new ClassGen(clazz));
            }

            jar.close();
        } catch (Exception e) {
            Logger.logerrf("Error while loading classes: %s", e);
            return false;
        }
        Logger.logf("Loaded %d classes", classes.size());
        return classes.size() > 0;
    }