java applet RuntimeException Java.lang.InvocationTargetException

StackOverflow https://stackoverflow.com/questions/22542297

Question

I have written a very basic applet, as I have only begun learning. This particular applet should only show some text, however whenever I run this locally (I have configured java to medium security) or from the server, I get the following error with no details:

RuntimeException Java.lang.InvocationTargetException

I have tried using Chrome, Firefox, IE but I get the same error message for all of them.

Here is my HTML:

<html>
    <body>
        <applet code="app.class" width="400" height="400"></applet>
    </body>
</html>

Here is my java code:

import javax.swing.*;
import java.awt.*;

class app extends JApplet {
    public void paint (Graphics g){
        super.paint(g);
        g.drawString("GIO", 15, 25);
    }
}

This is where my applet is: http://testingsomestuff.netne.net/

Thank you for your help.

Était-ce utile?

La solution

An applet has to be declared public. So:

class app extends JApplet {

Should be:

public class app extends JApplet {

Tips

1) Please learn common Java naming conventions (specifically the case used for the names) for class, method & attribute names & use them consistently.

2) Ensure the Java Console is configured to show for applets & JWS apps. If there is no output at the default level, raise it and try again.

3) The code attribute should be the FQN, not the file name, so:

    <applet code="app.class" width="400" height="400"></applet>

Should be:

    <applet code="app" width="400" height="400"></applet>
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