@Override
 public synchronized ModuleClassLoader getModuleClassLoader() {
   if (moduleClassLoader == null && getBundle().isResolved()) {
     ModuleIdentifier identifier = getModuleIdentifier();
     try {
       ModuleManager moduleManager = getFrameworkState().getModuleManager();
       Module module = moduleManager.loadModule(identifier);
       moduleClassLoader = module.getClassLoader();
     } catch (ModuleLoadException ex) {
       throw FrameworkMessages.MESSAGES.illegalStateCannotLoadModule(ex, identifier);
     }
   }
   return moduleClassLoader;
 }
  @Test
  public void testServiceLoaderFails() throws Exception {

    // The {@link ModularURLStreamHandlerFactory} follows a pattern similar to this.
    SystemBundleState systemBundle = getBundleManager().getSystemBundle();
    ModuleManager plugin = getFrameworkState().getModuleManager();
    Module frameworkModule = plugin.loadModule(systemBundle.getModuleIdentifier());
    assertNotNull("Framework module not null", frameworkModule);

    // Test resource access
    ModuleClassLoader classLoader = frameworkModule.getClassLoader();
    URL resource =
        classLoader.getResource("META-INF/services/" + URLStreamHandlerFactory.class.getName());
    assertNull("Resource URL null", resource);

    // Test ServiceLoader access
    Iterator<URLStreamHandlerFactory> iterator =
        frameworkModule.loadService(URLStreamHandlerFactory.class).iterator();
    assertFalse("No more URLStreamHandlerFactory", iterator.hasNext());
  }