Javafx webengine使loadContent像同步一样

Question

我想让loadContent在我执行方法中的下一个语句之前完成加载网页。 IE我希望它表现得像是一个同步方法。这是因为否则我得到Javascript例外，例如通过执行Exception in thread "JavaFX Application Thread" netscape.javascript.JSException: ReferenceError: Can't find variable: ace

之类的内容webEngine.executeScript(ace ....)

从在线帖子中，我尝试了以下内容（但它们不起作用......

（Try1）

...some code...
this.webEngine.getLoadWorker().stateProperty().addListener((obs, oldState, newState) -> {
        if (newState != Worker.State.SUCCEEDED) {
          return;
        }
    });
    this.webEngine.loadContent(...);
 ...more code...

（Try2）

...some code...
this.webEngine.getLoadWorker().stateProperty().addListener((obs, oldState, newState) -> {
        if (newState == Worker.State.SUCCEEDED) {
          new CountDownLatch(1).countDown();
        }
    });
    this.webEngine.loadContent(...);
 ...more code...

（Try3）

...some code...
CountDownLatch latch=new CountDownLatch(1);
this.webEngine.getLoadWorker().stateProperty().addListener((obs, oldState, newState) -> {
        if (newState != Worker.State.SUCCEEDED) {
          latch.countDown();
        }
    });
    this.webEngine.loadContent(...);
 ...more code...

请帮我解决这个问题......提前谢谢！