public Set<String> listResources(String subdir) { try { Set<String> result = new HashSet<String>(); if (resourceURL != null) { String protocol = resourceURL.getProtocol(); if (protocol.equals("jar")) { String resPath = resourceURL.getPath(); int pling = resPath.lastIndexOf("!"); URL jarURL = new URL(resPath.substring(0, pling)); String resDirInJar = resPath.substring(pling + 2); String prefix = resDirInJar + subdir + "/"; // System.out.printf("BaseMod.listResources: looking for names starting with %s\n", // prefix); JarFile jar = new JarFile(new File(jarURL.toURI())); Enumeration<JarEntry> entries = jar.entries(); while (entries.hasMoreElements()) { String name = entries.nextElement().getName(); if (name.startsWith(prefix) && !name.endsWith("/") && !name.contains("/.")) { // System.out.printf("BaseMod.listResources: name = %s\n", name); result.add(name.substring(prefix.length())); } } } else throw new RuntimeException("Resource URL protocol " + protocol + " not supported"); } return result; } catch (Exception e) { throw new RuntimeException(e); } }