JavaScript Function Causes Applet's URLConnection.connect to Fail

My website features a Java Applet that needs to connect to the server. Interestingly, it successfully connects in JApplets @Override init(), but when called by JavaScript, it fails to do so.

final URL url = new URL(SERVER_URL + action);
System.out.println("url:" + url);
System.out.println("postString: " + postString);
final HttpURLConnection connection = (HttpURLConnection) url.openConnection();
if(!postString.isEmpty()) {
    connection.setRequestMethod("POST");
    connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
    connection.setRequestProperty("Content-Length", Integer.toString(postString.getBytes().length));
    connection.setUseCaches(false);
    connection.setDoInput(true);
    connection.setDoOutput(true);

    System.out.println("connecting...");
    connection.connect(); // same with connection.getOutputStream();
    System.out.println("connected");
    ....

The setup on my website:

<a href="javascript: document.applet.update();" title="update from server">Update</a>
<applet id="applet" archive="/public/Antucation-0.1.0.jar?random=3765332307555812156" code="de.antucation.controller.Controller.class" width="100%" height="800px">
<param name="colonyId" value="1">
</applet>

The output shows:

url:http://localhost:9000/applet/showCode
postString: colonyId=1
connecting...

I have tried putting a try-catch block around it with a System.out call, but no luck there either. However, calling 

@Override public void init() { update(); }
works perfectly fine.

And yes, the applet is also hosted at http://localhost:9000/

How can I resolve this issue or find a workaround?

javajavascriptsecurityapplet

Answer №1

Consider trying a similar approach:

private void executeJavaScriptCall(final String parameter) {
    AccessController.doPrivileged( new PrivilegedAction<Void>() {
        public Void run() {
            // Add code here to establish the connection.
            return null;
        }
    });
}

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