JavaFX webEngine method 'executeScript' does not not as planned in Java

Hi all

I hope that I will be able to describe my problem properly.

I use a Java program for collecting JXTA messages and then based on receive messages, add markers to static locations on google maps. I use JavaFx to display google map zoomed on the custom location. I have included locations of marker in the JavaScript function so that the program knows where to place what marker on google maps and on its own, JavaFx code works well.

I want to call webEngine.executeScript ('myJavaScriptFucntion') inside my Java program. I have a listener pipeMsgEvent for tubes JXTA and upon receipt of a particular message, appropriate webEngine.executeScript('myJavaScriptFucntion') should be called and a marker should appear in the map on the time of execution.

This is my code of JavaFx

+ / public class JavaFX_GoogleMaps extends Application {+

public stage;
MyBrowser myBrowser.

public JavaFX_GoogleMaps () + {+

+}+

+ () public static Sub initJavaFX_GoogleMaps {+
Launch ("Hello");
+}+

+@Override+
+ ' public void start (course primaryStage) {+
primaryStage.setTitle ("my app");

myBrowser = new MyBrowser();
scene = new scene (myBrowser, 800, 600);

primaryStage.setScene (scene);
primaryStage.show ();
+}+
+}+
+ class MyBrowser extends the region {+

HBox toolbar;

public static final WebView webView = new WebView();
public static final WebEngine webEngine = webView.getEngine ();
final button = new Button ("add a reference");

+ public MyBrowser() {+
final urlGoogleMaps URL = getClass () .getResource ("googlemaps.html");
webEngine.load (urlGoogleMaps.toExternalForm ());
toolbar = new HBox();
toolbar.getChildren () .addAll (button);
getChildren () .add (webView);

+ Button.setOnAction (new EventHandler < ActionEvent > () {+)
+@Override+
+ ' public void handle (ActionEvent t) {+
putMarker();
+}+
+});+
getChildren () .add (toolbar);

+}+

+ public static void putMarker() {+
MyBrowser.webEngine.executeScript ("addJFCmarker ()");
+}+
+}+

and in my Java program I call first

JavaFX_GoogleMaps.initJavaFX_GoogleMaps (); in the main method

and then I call inside the pipeMsgEvent() method

MyBrowser.putMarker ();

When I run the program there is no error, no warning and no exceptions. Except that when my message is received no marker is placed on the google map.

To check, if my code works, I placed a button (add the marker) in my JavaFx code and called the same function of putMarker() in EventHandler for button. When I click on the button the markers are displayed on the map exactly as I want them.

Then of course there is a problem when I call putMarker() in my Java program, even if I get no error, exception or warning. I think that when I call MyBrowser.putMarker () method a new MyBrowser instance is created and call goes to this instance, but this new instance has no window display the pitch of its own output appears.

In any case I hope I explained my problem, so any suggestion on what should I do to get the markers displayed from Java code?

--
Kind regards

Imran

Published by: 1008054 on May 26, 2013 10:57

You must watch this line to understand what is null (it will be a reference on which you call a method) and why.

It seems that you have all kinds of problems in the present code. Your main method instantiates an object of type MyApp, which you called CAN, and then calls methods on it. Then call launch (args). The launch (...) method will instantiate another instance of MyApp, call init(), then call start (...), according to the [url http://docs.oracle.com/javafx/2/api/javafx/application/Application.html] javadocs for the Application. Yet once, it will not be the same instance of MyApp as the one on which you called startCAN() and fetch_advertisements(), so the effects of these methods will probably never be seen.

So, I'm guessing a bit here, but if startCAN() a thread start to turn, which calls your pipeMsgEvent (...) method, which will try to call myBrowser.putMarker (). This will give a NullPointerException as myBrowser is never initialized for the CAN. (myBrowser is initialized in the start (...) method and start (...) is never called for the CAN, he is invoked for the instance created by the launch (...) method.)

Tags: Java

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Thanks for posting your query in Microsoft Community.

I imagine the inconvenience that you are experiencing and will certainly help you in the right direction to solve the problem. However, I would be grateful if you could answer a few questions to refine the question in order to provide you with better assistance.
1. You did it any significant hardware or change software on the computer before this problem?
2. What is the brand and model of your computer?
3. What are the troubleshooting steps you have tried so far?
I understand that you are unable to start your Windows 7 system. To prevent your system from automatically restart, try to access the menu advanced startup options by turning on your computer and pressing the F8 key before Windows starts. Select the option disable automatic error system reboot. Also, I suggest you try the following steps of diagnostics to verify if you are able to reach the office in one of the following modes methodical.

Method 1:

Please follow the underlying steps:

Step 1. Disconnect all external devices except the keyboard and mouse.

Step 2 I would like to start your computer in last known good configuration.

If method 1 does not work, go to method 2.

Method 2:

Step 1: Try to start your system in a State of services necessary to the operation and a minimum set of drivers enabled, called Safe Mode.
Start your computer in safe mode

Step 2: If the system works fine in safe mode, try to clean the system startup:

How to perform a clean boot in Windows

Note: See "How to reset the computer to start normally after a boot minimum troubleshooting" to reset the computer to start as usual after a repair.

If method 2 does not work, go to method 3.

Method 3:

As you cannot start your computer at all, I suggest to run a Startup Repair to repair the damaged boot system files and try to boot into normal mode. See the section: How to use Startup Repair in the following link.

Startup Repair: frequently asked questions

If this does not help, try to boot from a disc to install Windows 7 on the Windows recovery environment mode and then try to run the Startup Repair tool and check if you are able to start normally.

If the problem persists, proceed to method 4.

Method 4:

You can use the Bootrec.exe tool in the recovery Windows (WINRE) environment to troubleshoot and repair the following items in Windows Vista or Windows 7:
- A master boot record (MBR)
- A boot sector
A Boot Configuration data (BCD) store

Note: When you are troubleshooting startup issues by using the Windows RE, you should first try the Startup Repair option in the System Recovery Options dialog box. If the Startup Repair option does not resolve the problem, or if you must troubleshoot more steps manually, use the Bootrec.exe

Use the Bootrec.exe tool in the Windows recovery environment to troubleshoot and repair startup issues in Windows

Hope this information is useful. Let us know if you need more help, we will be happy to help you.

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