使用JavaFX的WebView NullPointerException [英] WebView NullPointerException using JavaFX
问题描述
最近将WebView
窗格添加到我的JavaFX Application中.调整程序大小时,出现此错误,程序冻结.
Recently adding a WebView
pane to my JavaFX Application. When resizing my program I get this error and the program freezes.
java.lang.NullPointerException
at com.sun.javafx.webkit.prism.WCPageBackBufferImpl.validate(WCPageBackBufferImpl.java:97)
at com.sun.webkit.WebPage.paint(WebPage.java:644)
at com.sun.javafx.sg.prism.NGWebView.renderContent(NGWebView.java:95)
at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2067)
at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1959)
at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:235)
at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:576)
at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2067)
at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1959)
at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:235)
at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:576)
at com.sun.javafx.sg.prism.NGNode.renderForClip(NGNode.java:2308)
at com.sun.javafx.sg.prism.NGNode.renderRectClip(NGNode.java:2202)
at com.sun.javafx.sg.prism.NGNode.renderClip(NGNode.java:2228)
at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2061)
at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1959)
at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:235)
at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:576)
at com.sun.javafx.sg.prism.NGNode.renderForClip(NGNode.java:2308)
at com.sun.javafx.sg.prism.NGNode.renderRectClip(NGNode.java:2202)
at com.sun.javafx.sg.prism.NGNode.renderClip(NGNode.java:2228)
at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2061)
at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1959)
at com.sun.javafx.tk.quantum.ViewPainter.doPaint(ViewPainter.java:474)
at com.sun.javafx.tk.quantum.ViewPainter.paintImpl(ViewPainter.java:327)
at com.sun.javafx.tk.quantum.PresentingPainter.run(PresentingPainter.java:91)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
at com.sun.javafx.tk.RenderJob.run(RenderJob.java:58)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at com.sun.javafx.tk.quantum.QuantumRenderer$PipelineRunnable.run(QuantumRenderer.java:125)
at java.lang.Thread.run(Thread.java:745)
Webview所访问的网站是
The website that the webview goes to is
有人可以告诉我是什么原因引起的吗?
Can someone tell me what causes this issue?
不确定为什么需要这样做,但这是所要求的代码:
Not sure why this is needed, but here is the code as requested:
public class Controller implements Initializable {
@FXML
public WebView webView;
@Override
public void initialize(URL location, ResourceBundle resources) {
webView.getEngine().load("http://abendigo.org/gui/");
}
}
错误再现的视频: https://youtu.be/6CLPt45AbW0
推荐答案
我遇到了相同的错误.很难找到原因. 最后,我发现:当宽度或高度太大(即超过8500像素)时,webView布局会抛出nullPointerExpection.
I was faced with the same bug. It was quite difficult to find the reason. At last, I found : webView layout throw a nullPointerExpection when width or height is too large, ie over 8500 pixel.
良好的旁路功能太过限制了webView的maxWidth/maxHeight到场景大小:
And the good bypass was too limit the maxWidth/maxHeight of the webView to scene size :
webView.sceneProperty().addListener(new ChangeListener<Scene>() {
@Override
public void changed(ObservableValue<? extends Scene> observable, Scene oldValue, Scene scene) {
if (scene != null) {
webView.setMaxSize(getScene().getWidth(), getScene().getHeight());
webView.maxWidthProperty().bind(getScene().widthProperty());
webView.maxHeightProperty().bind(getScene().heightProperty());
} else {
webView.maxWidthProperty().unbind();
webView.maxHeightProperty().unbind();
}
}
});
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