How to get the JavaFx WebEngine to report errors in detail?

Question

In JavaFx I can attach a listener to the load worker for a webEngine like this:

 webEngine.getLoadWorker().stateProperty().addListener(
      new ChangeListener<Worker.State>() {
      public void changed(ObservableValue ov, Worker.State oldState, Worker.State newState) {                               
             System.out.println("webEngine result "+ newState.toString());
      }
  });

However if I try to load a document at an https address such as:

https://SomeLocalMachine.com:9443/jts/admin#action=com.ibm.team.repository.manageUsers

all I get printed out on the console is:

webEngine result READY
webEngine result SCHEDULED
webEngine result RUNNING
webEngine result FAILED

(The same https address in Firefox or Chrome gets me a login page)

Does anyone know how I can get more detailed reports out of the JavaFx WebEngine. I don't want to just know that it failed - I need to know why. I can guess my error is SSL/certificate/HTTPS related but currently I'm quite in the dark as to which part of SSL caused it to 'FAIL'

score 19 · Answer 1 · edited Jul 14 '17 at 07:45

19

You can use com.sun.javafx.webkit.WebConsoleListener. Downside is that it is JRE internal API.

WebConsoleListener.setDefaultListener(new WebConsoleListener(){
    @Override
    public void messageAdded(WebView webView, String message, int lineNumber, String sourceId) {
        System.out.println("Console: [" + sourceId + ":" + lineNumber + "] " + message);
    }
});

edited Jul 14 '17 at 07:45

dzikoysk

1,560
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answered Jun 10 '16 at 17:01

Marcin Fatyga

191
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3

6

This method does not exist >= Java 11 – Steven Spungin Aug 25 '19 at 15:04
why the F would they take this out without adding a corresponding public API to handle the console? – Jason S Aug 19 '20 at 17:35
re *"JRE internal API" / "does not exist >= Java 11"*. If you are using JavaFX as a module, this is indeed not accessible (not exported by the javafx module). However, if you're using the unsupported-but-working javaFX-as-jar-dependency setup, you *can* use `WebConsoleListener.setDefaultListener()` Source: I just used this method yesterday, on JavaFX 17.0.2 on JDK 17. – Jules Kerssemakers Sep 22 '22 at 11:53
See also: [What is the public API for getting JavaFX WebView console events?](https://stackoverflow.com/questions/55072824) – Jules Kerssemakers Sep 22 '22 at 11:57

score 8 · Answer 2 · answered Oct 10 '13 at 14:04

Have you tried the following:

engine.getLoadWorker().exceptionProperty().addListener(new ChangeListener<Throwable>() {
    @Override
    public void changed(ObservableValue<? extends Throwable> ov, Throwable t, Throwable t1) {
        System.out.println("Received exception: "+t1.getMessage());
    }
});

score 8 · Accepted Answer · edited Aug 03 '17 at 23:00

8

The best we ever got was:

if (webEngine.getLoadWorker().getException() != null && newState == State.FAILED) {
    exceptionMessage = ", " + webEngine.getLoadWorker().getException().toString();
}

but that didn't help.

(Our error was caused by a missing CookieStore, it seems you don't get one for free - and have to set a default one: http://docs.oracle.com/javase/7/docs/api/java/net/CookieHandler.html)

edited Aug 03 '17 at 23:00

dzikoysk

1,560
1
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27

answered Oct 11 '13 at 08:15

Tony Eastwood

781
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23

Where did you put that code? In the web engine load worker state property change listener? – jewelsea Oct 11 '13 at 08:37
Yes in ChangeListener as in ' webEngine.getLoadWorker().stateProperty().addListener( new ChangeListener()..... – Tony Eastwood Oct 11 '13 at 12:51

How to get the JavaFx WebEngine to report errors in detail?

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