我面临的问题测试方法，返回任务对象的javafx.concurrent.Task包.当我运行测试，程序中止，它无法创建新的BasicDataSource对象，甚至没有抛出任何异常，测试通过太.所以很难跟踪确切的问题.我的意思是，它可能是有关线程，但不完全确定.
连接池代码段（问题源自此处）：

public synchronized static DataSource getDataSource() {

        try {

            Properties property = new Properties();
            URL url = SessionManager.class.getResource("/properties/database.properties");
            property.load(new FileInputStream(Objects.requireNonNull(url).getFile()));
            if (dataSource == null) {
                synchronized (ConnectionPool.class) {

                    if (dataSource == null)
                        dataSource = new BasicDataSource(); //Program aborts here
                }
            }
            
            dataSource.setUrl(property.getProperty("DB_URL"));
            dataSource.setUsername(property.getProperty("DB_USERNAME"));
            dataSource.setPassword(property.getProperty("DB_PASSWORD"));
            dataSource.setMaxTotal(Integer.parseInt(property.getProperty("DB_MAX_CONNECTIONS")));
            dataSource.setMaxOpenPreparedStatements(Integer.parseInt(property.getProperty("DB_MAX_PREPARED_STATEMENTS")));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return dataSource;
    }

Junit 5测试片段：

@BeforeAll
    static void initJavaFxToolkit() {

        // Initialize the JavaFX toolkit
        Platform.startup(() -> {
        });
    }

    @AfterAll
    static void tearDown() {

        Platform.exit();
    }

    @Test
    @DisplayName("Test if user credentials pass on correct credentials")
    void testIfUserCredentialsPassOnCorrectCredentials() {

        LoginCredentials loginCredentials = new LoginCredentials("organization", "Hello123#", true);
        Validator login = new Login(loginCredentials);

        Task<AuthenticationStatus> task = login.getUserValidationStatus();
        Platform.runLater(() -> task.setOnSucceeded(workerStateEvent -> assertEquals(AuthenticationStatus.SUCCESS, task.getValue())));
    }

第一次调用getDataSource()的方法

@Override
    public Optional<Long> retrieveUserId(String username) throws SQLException {

        String sql = "SELECT user_id FROM personal_details WHERE username = ?";

        //problem occurs down here
        try (Connection connection = ConnectionPool.getDataSource().getConnection()) {

            //rest of code
    }

任务返回方式：

@Override
    public synchronized Task<AuthenticationStatus> getUserValidationStatus() {

        Task<AuthenticationStatus> loginTask = new Task<>() {
            @Override
            protected AuthenticationStatus call() {

                //rest of code

                Optional<Long> optionalUserID = retrieveUserId(username); //problem
                userID = optionalUserID.orElse(0L);

                //rest of code
        };

        Thread thread = new Thread(loginTask);
        thread.setDaemon(true);
        thread.start();
        return loginTask;
    }

正如您在测试片段中看到的，我尝试初始化JavaFX工具包，以便创建FXApplicationThread，但这没有帮助。
注：执行非测试/源代码时，应用程序运行正常。