294     public void testWithCustomLayer3() {
 295         Layer bootLayer = Layer.boot();
 296         Configuration cf0 = bootLayer.configuration();
 297 
 298         // boot layer should contain "bananascript"
 299         List<ScriptEngineFactory> factories
 300             = collectAll(ServiceLoader.load(bootLayer, ScriptEngineFactory.class));
 301         int countInBootLayer = factories.size();
 302         assertTrue(countInBootLayer >= 1);
 303         assertTrue(factories.stream()
 304                 .map(p -> p.getEngineName())
 305                 .filter("BananaScriptEngine"::equals)
 306                 .findAny()
 307                 .isPresent());
 308 
 309         ClassLoader scl = ClassLoader.getSystemClassLoader();
 310         Path dir = Paths.get(System.getProperty("test.classes", "."), "modules");
 311         ModuleFinder finder = ModuleFinder.of(dir);
 312 
 313         // layer1
 314         Configuration cf1 = cf0.resolveRequiresAndUses(finder, ModuleFinder.of(), Set.of());
 315         Layer layer1 = bootLayer.defineModulesWithOneLoader(cf1, scl);
 316         assertTrue(layer1.modules().size() == 1);
 317 
 318         // layer2
 319         Configuration cf2 = cf0.resolveRequiresAndUses(finder, ModuleFinder.of(), Set.of());
 320         Layer layer2 = bootLayer.defineModulesWithOneLoader(cf2, scl);
 321         assertTrue(layer2.modules().size() == 1);
 322 
 323         // layer3 with layer1 and layer2 as parents
 324         Configuration cf3 = Configuration.resolveRequiresAndUses(finder,
 325                 List.of(cf1, cf2),
 326                 ModuleFinder.of(),
 327                 Set.of());
 328         Layer layer3 = Layer.defineModulesWithOneLoader(cf3, List.of(layer1, layer2), scl).layer();
 329         assertTrue(layer3.modules().size() == 1);
 330 
 331 
 332         // class loaders
 333         ClassLoader loader1 = layer1.findLoader("bananascript");
 334         ClassLoader loader2 = layer2.findLoader("bananascript");
 335         ClassLoader loader3 = layer3.findLoader("bananascript");
 336         assertTrue(loader1 != loader2);
 337         assertTrue(loader1 != loader3);
 338         assertTrue(loader2 != loader3);
 339 
 340         // load all factories with layer3 as the context
 341         factories = collectAll(ServiceLoader.load(layer3, ScriptEngineFactory.class));
 342         int count = factories.size();
 343         assertTrue(count == countInBootLayer + 3);
 344 

 396     public void testLoadNull4() {
 397         ServiceLoader.load(Layer.empty(), null);
 398     }
 399 
 400     @Test(expectedExceptions = { NullPointerException.class })
 401     public void testLoadNull5() {
 402         ServiceLoader.loadInstalled(null);
 403     }
 404 
 405     /**
 406      * Create a custom Layer by resolving the given module names. The modules
 407      * are located in the {@code ${test.classes}/modules} directory.
 408      */
 409     private Layer createCustomLayer(String... modules) {
 410         Path dir = Paths.get(System.getProperty("test.classes", "."), "modules");
 411         ModuleFinder finder = ModuleFinder.of(dir);
 412         Set<String> roots = new HashSet<>();
 413         Collections.addAll(roots, modules);
 414         Layer bootLayer = Layer.boot();
 415         Configuration parent = bootLayer.configuration();
 416         Configuration cf = parent.resolveRequires(finder, ModuleFinder.of(), roots);
 417         ClassLoader scl = ClassLoader.getSystemClassLoader();
 418         Layer layer = bootLayer.defineModulesWithOneLoader(cf, scl);
 419         assertTrue(layer.modules().size() == 1);
 420         return layer;
 421     }
 422 
 423     private <E> List<E> collectAll(ServiceLoader<E> loader) {
 424         List<E> list = new ArrayList<>();
 425         Iterator<E> iterator = loader.iterator();
 426         while (iterator.hasNext()) {
 427             list.add(iterator.next());
 428         }
 429         return list;
 430     }
 431 }
 432 

 294     public void testWithCustomLayer3() {
 295         Layer bootLayer = Layer.boot();
 296         Configuration cf0 = bootLayer.configuration();
 297 
 298         // boot layer should contain "bananascript"
 299         List<ScriptEngineFactory> factories
 300             = collectAll(ServiceLoader.load(bootLayer, ScriptEngineFactory.class));
 301         int countInBootLayer = factories.size();
 302         assertTrue(countInBootLayer >= 1);
 303         assertTrue(factories.stream()
 304                 .map(p -> p.getEngineName())
 305                 .filter("BananaScriptEngine"::equals)
 306                 .findAny()
 307                 .isPresent());
 308 
 309         ClassLoader scl = ClassLoader.getSystemClassLoader();
 310         Path dir = Paths.get(System.getProperty("test.classes", "."), "modules");
 311         ModuleFinder finder = ModuleFinder.of(dir);
 312 
 313         // layer1
 314         Configuration cf1 = cf0.resolveAndBind(finder, ModuleFinder.of(), Set.of());
 315         Layer layer1 = bootLayer.defineModulesWithOneLoader(cf1, scl);
 316         assertTrue(layer1.modules().size() == 1);
 317 
 318         // layer2
 319         Configuration cf2 = cf0.resolveAndBind(finder, ModuleFinder.of(), Set.of());
 320         Layer layer2 = bootLayer.defineModulesWithOneLoader(cf2, scl);
 321         assertTrue(layer2.modules().size() == 1);
 322 
 323         // layer3 with layer1 and layer2 as parents
 324         Configuration cf3 = Configuration.resolveAndBind(finder,
 325                 List.of(cf1, cf2),
 326                 ModuleFinder.of(),
 327                 Set.of());
 328         Layer layer3 = Layer.defineModulesWithOneLoader(cf3, List.of(layer1, layer2), scl).layer();
 329         assertTrue(layer3.modules().size() == 1);
 330 
 331 
 332         // class loaders
 333         ClassLoader loader1 = layer1.findLoader("bananascript");
 334         ClassLoader loader2 = layer2.findLoader("bananascript");
 335         ClassLoader loader3 = layer3.findLoader("bananascript");
 336         assertTrue(loader1 != loader2);
 337         assertTrue(loader1 != loader3);
 338         assertTrue(loader2 != loader3);
 339 
 340         // load all factories with layer3 as the context
 341         factories = collectAll(ServiceLoader.load(layer3, ScriptEngineFactory.class));
 342         int count = factories.size();
 343         assertTrue(count == countInBootLayer + 3);
 344 

 396     public void testLoadNull4() {
 397         ServiceLoader.load(Layer.empty(), null);
 398     }
 399 
 400     @Test(expectedExceptions = { NullPointerException.class })
 401     public void testLoadNull5() {
 402         ServiceLoader.loadInstalled(null);
 403     }
 404 
 405     /**
 406      * Create a custom Layer by resolving the given module names. The modules
 407      * are located in the {@code ${test.classes}/modules} directory.
 408      */
 409     private Layer createCustomLayer(String... modules) {
 410         Path dir = Paths.get(System.getProperty("test.classes", "."), "modules");
 411         ModuleFinder finder = ModuleFinder.of(dir);
 412         Set<String> roots = new HashSet<>();
 413         Collections.addAll(roots, modules);
 414         Layer bootLayer = Layer.boot();
 415         Configuration parent = bootLayer.configuration();
 416         Configuration cf = parent.resolve(finder, ModuleFinder.of(), roots);
 417         ClassLoader scl = ClassLoader.getSystemClassLoader();
 418         Layer layer = bootLayer.defineModulesWithOneLoader(cf, scl);
 419         assertTrue(layer.modules().size() == 1);
 420         return layer;
 421     }
 422 
 423     private <E> List<E> collectAll(ServiceLoader<E> loader) {
 424         List<E> list = new ArrayList<>();
 425         Iterator<E> iterator = loader.iterator();
 426         while (iterator.hasNext()) {
 427             list.add(iterator.next());
 428         }
 429         return list;
 430     }
 431 }
 432