JavaFX "toolkit not initialized" 在一项测试中 class 而不是另外两项；区别在哪里？

Question

环境：

甲骨文 JDK 1.8u31;
Intellij IDEA 14.0.3；
Mockito 1.10.17；
TestNG 6.8.13.

首先，关于架构的快速目标：JavaFX 称之为 "controller" 我称之为显示，我有一个视图 class 控制显示的元素。

所有这些观点都继承了一个共同的基础class:

public abstract class JavafxView<P, D extends JavafxDisplay<P>>
{
    protected final Node node;
    protected final D display;

    protected JavafxView(final String fxmlLocation)
        throws IOException
    {
        final URL url = JavafxView.class.getResource(fxmlLocation);
        if (url == null)
            throw new IOException(fxmlLocation + ": resource not found");
        final FXMLLoader loader = new FXMLLoader(url);
        node = loader.load();
        display = loader.getController();
    }

    @SuppressWarnings("unchecked")
    @NonFinalForTesting
    public <T extends Node> T getNode()
    {
        return (T) node;
    }

    @NonFinalForTesting
    public D getDisplay()
    {
        return display;
    }
}

起初我在开始测试时遇到了问题，因为我每次都会得到 "toolkit not initialized"。但是，在问完这个问题后，我效果很好；我现在可以毫无问题地编写测试来测试行为...

只是我现在偶然发现了一个测试，在这个测试中我又遇到了这个错误：

java.lang.ExceptionInInitializerError
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:408)
    at java.lang.Class.newInstance(Class.java:438)
    at sun.reflect.misc.ReflectUtil.newInstance(ReflectUtil.java:51)
    at javafx.fxml.FXMLLoader$InstanceDeclarationElement.constructValue(FXMLLoader.java:1001)
    at javafx.fxml.FXMLLoader$ValueElement.processStartElement(FXMLLoader.java:742)
    at javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2701)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2521)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2435)
    at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2403)
    at com.github.fge.grappa.debugger.javafx.JavafxView.<init>(JavafxView.java:24)
    at com.github.fge.grappa.debugger.csvtrace.tabs.matches.JavafxMatchesTabView.<init>(JavafxMatchesTabView.java:24)
    at com.github.fge.grappa.debugger.csvtrace.tabs.matches.JavafxMatchesTabViewTest.init(JavafxMatchesTabViewTest.java:28)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:84)
    at org.testng.internal.Invoker.invokeConfigurationMethod(Invoker.java:564)
    at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:213)
    at org.testng.internal.Invoker.invokeMethod(Invoker.java:653)
    at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:901)
    at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1231)
    at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:127)
    at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:111)
    at org.testng.TestRunner.privateRun(TestRunner.java:767)
    at org.testng.TestRunner.run(TestRunner.java:617)
    at org.testng.SuiteRunner.runTest(SuiteRunner.java:348)
    at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:343)
    at org.testng.SuiteRunner.privateRun(SuiteRunner.java:305)
    at org.testng.SuiteRunner.run(SuiteRunner.java:254)
    at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
    at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
    at org.testng.TestNG.runSuitesSequentially(TestNG.java:1224)
    at org.testng.TestNG.runSuitesLocally(TestNG.java:1149)
    at org.testng.TestNG.run(TestNG.java:1057)
    at org.testng.remote.RemoteTestNG.run(RemoteTestNG.java:111)
    at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:204)
    at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:175)
    at org.testng.RemoteTestNGStarter.main(RemoteTestNGStarter.java:125)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)
Caused by: java.lang.IllegalStateException: Toolkit not initialized
    at com.sun.javafx.application.PlatformImpl.runLater(PlatformImpl.java:270)
    at com.sun.javafx.application.PlatformImpl.runLater(PlatformImpl.java:265)
    at com.sun.javafx.application.PlatformImpl.setPlatformUserAgentStylesheet(PlatformImpl.java:540)
    at com.sun.javafx.application.PlatformImpl.setDefaultPlatformUserAgentStylesheet(PlatformImpl.java:502)
    at javafx.scene.control.Control.<clinit>(Control.java:87)
    ... 47 more

JavafxView.java:24是这一行：

node = loader.load();

不过，这还不是最奇怪的。

我有另外两个测试 classes 测试另外两个 JavafxView 当我单独运行测试 classes 时它们没有问题；只有这个新测试没有...

... 但是如果我运行整个测试套件而不是仅那个测试那么测试成功！

这里是测试的完整源代码：

public class JavafxMatchesTabViewTest
{
    private JavafxMatchesTabView view;
    private MatchesTabDisplay display;

    @BeforeMethod
    public void init()
        throws IOException
    {
        view = new JavafxMatchesTabView();
        display = view.getDisplay();
    }

    @Test
    public void showMatchesTest()
    {
        final List<MatchStatistics> oldStats = Arrays.asList(
            mock(MatchStatistics.class),
            mock(MatchStatistics.class)
        );

        final List<MatchStatistics> newStats = Arrays.asList(
            mock(MatchStatistics.class),
            mock(MatchStatistics.class)
        );

        final TableView<MatchStatistics> tableView = spy(new TableView<>());
        display.matchesTable = tableView;

        final ObservableList<MatchStatistics> tableData = tableView.getItems();
        final ObservableList<TableColumn<MatchStatistics, ?>> sortOrder
            = tableView.getSortOrder();

        tableData.setAll(oldStats);
        sortOrder.clear();

        view.showMatches(newStats);

        assertThat(tableData).containsExactlyElementsOf(newStats);
        assertThat(sortOrder).containsExactly(display.nrCalls);
        verify(tableView).sort();
    }
}

那么，呃，我该如何解决这个问题？乍一看，解决方案似乎是我 "port" 自定义 MockMaker 到 TestNG 的 @BeforeClass... 除了我不明白我怎么能真正这样做：/

Answer 1

嗯，我想我们必须将相同的方法应用于 @BeforeClass and/or @BeforeMethod.. 就像这样（未经测试）：

private boolean jfxIsSetup;

private void doOnJavaFXThread(Runnable pRun) throws RuntimeException {
    if (!jfxIsSetup) {
        setupJavaFX();
        jfxIsSetup = true;
    }
    final CountDownLatch countDownLatch = new CountDownLatch(1);
    Platform.runLater(() -> {
        pRun.run();
        countDownLatch.countDown();
    });

    try {
        countDownLatch.await();
    } catch (InterruptedException e) {
        throw new RuntimeException(e);
    }
}

protected void setupJavaFX() throws RuntimeException {
    final CountDownLatch latch = new CountDownLatch(1);
    SwingUtilities.invokeLater(() -> {
        new JFXPanel(); // initializes JavaFX environment
        latch.countDown();
    });

    try {
        latch.await();
    } catch (InterruptedException e) {
        throw new RuntimeException(e);
    }
}


@BeforeMethod
public void init() throws IOException
{
    AtomicReference<JavafxMatchesTabView> tabView = new AtomicReference<>();
    AtomicReference<MatchesTabDisplay> tabDisplay = new AtomicReference<>();
    doOnJavaFXThread(()->{
        tabView.set(new JavafxMatchesTabView());
        tabDisplay.set(view.getDisplay());
    });
    view = tabView.get();
    display = tabDisplay.get();
}

如果可行，将此代码移至抽象基础测试可能会更好 class ;-)

Answer 2

嗯，嗯，这比我想象的要简单，而且通常情况下，我只有在提出问题后才能找到解决方案...

无论如何，解决方案是创建一个抽象基础 class 来为您初始化工具包，它就像 "easy" 一样：

@Test
public abstract class JavafxViewTest
{
    @BeforeClass
    public static void initToolkit()
        throws InterruptedException
    {
        final CountDownLatch latch = new CountDownLatch(1);
        SwingUtilities.invokeLater(() -> {
            new JFXPanel(); // initializes JavaFX environment
            latch.countDown();
        });

        // That's a pretty reasonable delay... Right?
        if (!latch.await(5L, TimeUnit.SECONDS))
            throw new ExceptionInInitializerError();
    }
}

JavaFX "toolkit not initialized" 在一项测试中 class 而不是另外两项；区别在哪里？

JavaFX "toolkit not initialized" in one test class but not two others; where is the difference?

java

unit-testing

testng

mockito

javafx-8