OpenWebStart and JavaFx WebView

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Janak Mulani
Posts: 274
Joined: 24 Mar 2020, 13:37

OpenWebStart and JavaFx WebView

Post by Janak Mulani »

An App that uses JavaFX WebView from OpenJfx when started with OWS, crashes as soon as a URL is loaded in the. WebView.

The JRE used to run the App is Java 11 or higher.

The OpneJfx lib versions tried were 11.0.2, and also 16.

Jnlp file: (Note that s_ prefix means signed jar)

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<?xml version="1.0" encoding="utf-8"?>
<jnlp spec="1.0+">
    <information>
        <title>FXApp</title>
        <vendor>Karakun AG</vendor>
        <offline-allowed/>
    </information>
    <security>
        <all-permissions/>
    </security>
    <resources>
        <j2se version="1.8+" />
        	<jar href="s_javafx-controls-16-win.jar"/>
		<jar href="s_javafx-graphics-16-win.jar"/>
		<jar href="s_javafx-base-16-win.jar"/>
		<jar href="s_javafx-fxml-16-win.jar"/>
		<jar href="s_javafx-web-16-win.jar"/>
		<jar href="s_javafx-media-16-win.jar"/>
		<jar href="s_javafx-swing-16-win.jar"/>
		<jar href="javafx-test.jar"/>
    </resources>
   	<application-desc main-class="com.karakun.ows.javafx_test.FXWebViewLauncher"/> 
	<!-- FXAppLauncher FXWebViewLauncher SwingFXAppLauncher SwingFXWebViewAppLauncher -->
</jnlp> 
JavaFx App:

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public class FXWebViewApp extends Application {

    public static void main(String[] args) {
        launch(args);
    }

    public void start(Stage primaryStage) {
        primaryStage.setTitle("JavaFX WebView Example");

        final WebView webView = new WebView();

        TextField text1 = new TextField();
        text1.setTooltip(new Tooltip("Type Url without protocol"));

        Button btn = new Button();
        btn.setText("Load");
        btn.setOnAction(e -> {
                webView.getEngine().load("http://" + text1.getText());
            }
        );

        //Creating a Grid Pane
        GridPane gridPane = new GridPane();

        //Setting size for the pane
        gridPane.setMinSize(400, 200);

        //Setting the padding
        gridPane.setPadding(new Insets(10, 10, 10, 10));

        //Setting the vertical and horizontal gaps between the columns
        gridPane.setVgap(10);
        gridPane.setHgap(5);


        gridPane.setAlignment(Pos.CENTER);
        gridPane.add(text1, 0, 0);
        gridPane.add(btn, 0, 1);
        gridPane.add(webView, 0, 2);
        Scene scene = new Scene(gridPane, 960, 600);
        primaryStage.setScene(scene);
        primaryStage.show();
    }
}

Janak Mulani
Posts: 274
Joined: 24 Mar 2020, 13:37

Re: OpenWebStart and JavaFx WebView

Post by Janak Mulani »

It seems that the App with WebView was crashing on loading a URL because of bug OpenJfx. 11.0.2 to 16.

This bug has been fixed in OpenJfx v 17-ea+16.:So one can specify those jars in the jnlp file:

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<?xml version="1.0" encoding="utf-8"?>
<jnlp spec="1.0+">
    <information>
        <title>FXApp</title>
        <vendor>Karakun AG</vendor>
        <offline-allowed/>
    </information>
    <security>
        <all-permissions/>
    </security>
    <resources>
        <j2se version="11*" />
		<jar href="s_javafx-controls-17-ea+16-win.jar"/>
		<jar href="s_javafx-graphics-17-ea+16-win.jar"/>
		<jar href="s_javafx-base-17-ea+16-win.jar"/>
		<jar href="s_javafx-fxml-17-ea+16-win.jar"/>
		<jar href="s_javafx-web-17-ea+16-win.jar"/>
		<jar href="s_javafx-media-17-ea+16-win.jar"/>
		<jar href="s_javafx-swing-17-ea+16-win.jar"/>
		<jar href="javafx-test.jar"/>
    </resources>
	<application-desc main-class="com.karakun.ows.javafx_test.FXWebViewLauncher"/>
	<!-- FXAppLauncher FXWebViewLauncher SwingFXAppLauncher SwingFXWebViewAppLauncher -->
</jnlp> 
However When the above jnlp is run with OWS the App it self does not start complaining that JavaFx classes are not found. Log file:

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Launch Error: Could not launch JNLP file. ( (javafx/application/Application (javafx.application.Application)))
net.sourceforge.jnlp.LaunchException: Fatal: Launch Error: Could not launch JNLP file.
...
Caused by: java.lang.ClassNotFoundException: javafx.application.Application

Janak Mulani
Posts: 274
Joined: 24 Mar 2020, 13:37

Re: OpenWebStart and JavaFx WebView

Post by Janak Mulani »

There is a bug in OWS 1.4.0 such that it is not able to handle jar file names like javafx-controls-17-ea+16-win.jar. Character + in ea+16 is problematic. It results in the following error:

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Error while activating jars
java.io.FileNotFoundException: <path>\s_javafx-controls-17-ea 16-win.jar 
The workaround is to rename the OpenJfx jars and use the renamed jars in the jnlp file:

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...
<resources>
        <j2se version="11*" />
		<jar href="s_javafx-controls-17-win.jar"/>
		<jar href="s_javafx-graphics-17-win.jar"/>
		<jar href="s_javafx-base-17-win.jar"/>
		<jar href="s_javafx-fxml-17-win.jar"/>
		<jar href="s_javafx-web-17-win.jar"/>
		<jar href="s_javafx-media-17-win.jar"/>
		<jar href="s_javafx-swing-17-win.jar"/>
		<jar href="javafx-test.jar"/>
    </resources>
    ...

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