Invoke java using JavaScript inside JavaFX. Is it possible?

Question

I am using WebEngine & WebView from JavaFX. Now I want to execute Java using javascript running inside WebEngine.

My question is if it is possible to do so and if yes any hints.

I want do something like below

<script type="text/javascript">
  function runSampleJava() {
    var number = new java.lang.Integer(1234);
    var random = new java.util.Random();
    java.lang.System.out.println(random.nextInt());
  }
</script>

Now if I call the runSampleJava() inside WebEngine it will execute that code.

Points to be noted

This is not about Rhino JavaScript engine for java
I know it is possible to inject java object, eg: JSObject window = (JSObject) webEngine.executeScript("window"); and so on. But this is not what I am looking for.

Maybe this helps: nusphere.com/kb/jscoreref/javobj.html

Fildor
– Fildor

2013-01-14 15:50:07 +00:00
Commented Jan 14, 2013 at 15:50 — Fildor
– Fildor, Commented Jan 14, 2013 at 15:50
@Fildor it is way beyond the problem :-(

Kowser
– Kowser

2013-01-15 10:48:20 +00:00
Commented Jan 15, 2013 at 10:48 — Kowser
– Kowser, Commented Jan 15, 2013 at 10:48

tomsontom · Accepted Answer · 2016-11-30 19:41:49Z

4

I didn't manage to create Java instances but the thing I managed to do is to push object instances created in Java into JavaScript and call back to them.

So my Java-Code looks like this:

JSObject win = (JSObject) engine.executeScript("window");
win.setMember("jHelper", new JavaHelper());

JavaHelper example (must be public):

public static class JavaHelper {
    public int newInteger(int input) {
        // ...
    }
    public Random newRandom() {
        // ...
    }
}

And then then in JavaScript:

function bla() {
  var number = jHelper.newInteger(1234);
  var random = jHelper.newRandom();
  // ...
}

You can see my work where I communicate between Java and JavaScript back and forth at https://github.com/tomsontom/fx-ide/tree/master/at.bestsolution.javafx.ide.editor and in action at http://tomsondev.bestsolution.at/2012/10/29/eclipsecon-javafx-demo-app-videos/

edited Nov 30, 2016 at 19:41

user3453226

answered Jan 14, 2013 at 13:03

tomsontom

5,9272 gold badges26 silver badges21 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Kowser Over a year ago

As I have already specified, I can do it already. And this is not exactly what I am looking for. 'Specially' I need to create object.

tomsontom Over a year ago

I guess it would be a major security problem if the webview would be allowed to create arbitary objects and pass back and forth real java objects. So all I found was allowed to get passed between JavaScript and Java in webview are primitive types and strings (I use JSON from communicating with the Java-Side)

Kowser Over a year ago

Agreed with that security flaw.

Collectives™ on Stack Overflow

Invoke java using JavaScript inside JavaFX. Is it possible?

Points to be noted

1 Answer 1

3 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

Points to be noted

1 Answer 1

3 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related