Applet viewer question

Well here is my first question of what promises to be many. Nice to meet you all. Here goes:
While doing the first applet in "Your first cup of Java", I run the applet by typing:
appletviewer Hello.html
The applet runs in the applet viewer and looks just like the picure says it should. But I also get this warning in the command prompt:
Warning: Can't read AppletViewer properties file: C:\WINNT\Profiles\PURCHASER\.h
otjava\properties Using defaults.
Anybody know what the problem is there?
Thanks.

I wouldn't worry about it, I get the same errors using the computers at Uni. It's never stopped me anyway. I'm not sure what causes it, something to do with WinNT/2000 and profiles/users.
Cheers,
Radish21

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It looks like you're right, so how do I ensure that
my applet will look the same on different versions of
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I am trying to connect an applet to a server application run on my computer. The server application is run in the eclipse ide, but I doubt that makes a difference.
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Hi,
i copied ur code and tested it on my system(win 98 se with IE 5.5) it works fine.
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I'm not sure why you are getting the console message, but here is how you might use the tag. This will simply print out the list of immediate groups (not parent groups) to which user "weblogic" is a member.
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I have written an applet that access a php file and sends a post message. I have tested the applet with the applet viewer and it succeeds each time. When I put the applet on a web page I get the following error:
access denied (java.net.SocketPermission libraries.cjt-design.com:80 connect,resolve)
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1. Why does it work from the applet viewer and not
the webpage.Appletviewer is in effect a Java application so it runs using the Java application security manager which by default gives an application almost unlimited access to the machine it runs on.
Running an Applet from a Web page runs the Applet constrained by the Applet security manager. By default, the Applet security manager assumes that anything that is downloaded from the web is untrusted so severely limits what an Applet can do. A signed Applet is assumed to be trusted if the certificate chain points back to one of the certificate roots such as Verisign.
You can use self signing for test purposes and then a client will be asked whether or not he trusts the Applet.
2. How do I make the jar file signed?http://java.sun.com/docs/books/tutorial/jar/sign/signing.html
http://java.sun.com/j2se/1.5.0/docs/tooldocs/solaris/jarsigner.html
http://java.sun.com/developer/onlineTraining/Security/Fundamentals/magercises/Signtool/help.html

Applet Viewer

Greetings,
I just started studying java at my vocational school and i'm studying from a book that was published by The Oracle Online Academy. But anyways, my issue is that inside the book they have a little screen shot of what I should be seeing. They are using an Applet Viewing program instead of the standard Command line utility. I'm looking for the program that is used to view programs. Maybe even a GUI for compiling and viewing. Please reply if you know where I can find either of these utilities.
Mike Bailey

I think a little clarification is in order.
There are two kinds of java programs - applets and applications.
Applets are viewed through a html page using either the browser or the "appletviewer" utility
that comes with the jdk.
You cannot run applications with the appletviewer. That's why it is called Appletviewer.
Java applications on the other hand are run through the command line and may or may not
contain a gui - it depends on your program. The whole idea of having a gui to run java applications
defeats its purpose so there aren't any. Java applications - are always run from the command-line
using the "java someprogram" command.
The last thing which you asked for - a gui for compiling and viewing, however, is available. There
are numerous such tools and they are called IDE's (integrated development environments). They
allow you to compile and even run your programs...they look as if they run an application within
a gui but it actually gets run through the command line.
Check out http://www.gExperts.com for a IDE called Gel. Its small and powerful.
In retrospect, you need both the appletviewer (equivalent of a browser as far as applets are
concerned) and a command-line which is capable of running applications.
If you are so interested in running a gui version - why don't you write your own...you'll see they
are relatively easy...just go to..
http://java.sun.com/docs/books/tutorial/
This is one of the best resources to help you learn the language from beginner upto advanced level.
regards.

Works in applet viewer but not in internet explorer

I origionaly posted this on devshed. I got 55 views but no replies. It seems to be a common problem to which no one knows the answer. Surprise me :O)I'm sure this is a really common but there seems to be surprisinly litttle on the web about it.
I developed a game applet a while ago in applet viewer and am now thinking about putting it on my web site. However I have found that it doesn't work in internet explorer. I can browse other sites using Java fine. There is clearly just something about my applet that ie doesn't like.
Does anyone have any suggestions? What sort of things upset ie?
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Flo.

There must be some thing that tells you it isn't working. You should tell us so we don't have to guess. Does the browser hang? Do you get an error? Did you try opening the Java Console to see if there were any messages? I am guessing that your code is using something that the security level of an Applet does not allow (but appletviewer does allow).

Applet works on applet viewer but not in html, why not?

I'm using Eclipse as a development system and the Eclipse applet viewer shows my applets with no problem. They work the way I expect them to work and all is well.
When I try to run them in Internet Explorer, I first get a security warning. OK, I trust myself, so I tell Internet Explorer to run the applet. All I get is the text "Hello Dolly", but the applet doesn't run.
I tried refreshing it, running it again, allowing popups and opening the file, but it just won't run. What could be wrong with something so trivial?
Any suggestions would be appreciated.
<html>
<head>
<meta name="GENERATOR" content="Microsoft FrontPage 5.0">
<meta name="ProgId" content="FrontPage.Editor.Document">
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
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</head>
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Sorry, I didn't think there was anything special in the applet.
This just happens to be what I'm checking at the moment.
It has changed depending upon where in the tutorial I find myself.
Thanks for you help.
It has to be something really stupid that I'm missing, but since I'm still new at this game, I can miss something obvious to everyone else.
package hello;
import java.applet.Applet;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.util.Date;
public class Hello extends Applet implements Runnable {
     private static final long serialVersionUID = 1L;
     Color colors[] = new Color[50];
     Date date1 = null;
     Thread run1 = null;
     Font f1 = new Font("Ariel", Font.PLAIN, 14);
     public void run() {
          int i = 0;
          Thread currThread = Thread.currentThread();
          while (currThread == run1) {
               setForeground(colors);
               repaint();
               i++;
               if( i>= colors.length) i = 0;
               try { Thread.sleep(50); }
               catch (InterruptedException e) {}
     public void init() {
          int i;
          float c = 0.0f;
          for(i=0; i<colors.length; i++) {
               colors[i] = Color.getHSBColor(c, 1.0f, 1.0f);
               c += 0.2f;
     public void start() {
          if (run1 == null) {
               run1 = new Thread(this);
               run1.start();
     public void stop() {
          run1 = null;
     public void paint(Graphics g){
          date1 = new Date();
          g.setFont(f1);
          g.drawString(date1.toString(), 10, 50);

Applet Viewer Vs Internet Explorer

I have a applet that displays popupmenus on a button click it works great when viewed through the applet viewer but under Internet explorer everything appears right but when you click on a button hNothingapp
happens.

No threads! Thats not the issue here!!!
class a extends Applet implements ActionListener
   Button b;
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      add(b);
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}This is what you are describing... Check against my code to find what you have forgotten. Also: use the java console in IE a lot (View->Java Console) You have to switch it on under (Tools->Internet Options->Advanced->Microsoft VM)
Regards,
Ragnvald Barth
Software engineer

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If someone could help me out, I'm trying to place a picture in a program I made in the applet viewer. Thx.

Or just to start ...
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