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.

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I'm developing an applet using Net Beans 5.0. When I run the applet in the applet viewer I get a totally different look and feel than when I run the applet in a web broser. The background colors are different, the buttons are a totally different style and color, and some buttons that show up essentially transparent in the applet viewer are totally opaque in the browser.
The applet viewer is the one that looks like the interface that I designed in the Net Beans GUI builder, so can anyone tell me how I make it look the same in a Web Browser?

It looks like you're right, so how do I ensure that
my applet will look the same on different versions of
JVM? There's got to be a way, right??yes. you should look into javas pluggable look and feel system.
the cross-platform (java) look and feel changed dramatically between versions 1.3, 1.4, and 1.5.
however, if you use another look and feel, such as motif, or perhaps your system's look and feel (windows, mac, etc), the program should look pretty much the same (perhaps a little different, but not like the differences in the Java look and feel).
if you want to be COMPLETELY sure that they will always look the same, select a third party look and feel that comes packaged in a jar file that you are free to distribute with your applet.
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if you use one of those, it should look pretty well the same on all platforms, and in all JVM's.
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Applet works in applet viewer but not in website.

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Applet view Status bar

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null

Hi,
i copied ur code and tested it on my system(win 98 se with IE 5.5) it works fine.
I guess u might be using an older version of a browser thats why u r not able to view anything.it would be better if u mention the browser in which u tested ur code...
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AccessControlException when run in IE or Safari, but not Applet Viewer

My applet requires the use of a txt file as input. The txt file need only be read, and is always in the same directory as the class files and the web page the applet's running in. For a while now, there have been no problems with reading the txt file; however, recently, I've been getting a "java.security.AccessControlException: access denied (java.io.FilePermission *insert filename here* read)" error. Furthermore, this error only comes up when I run the applet in Internet Explorer or Safari; when I run it in the applet viewer, it works perfectly. On top of this, when I went to the tutorial suspecting that the problem had something to do with thread management, I noticed that all three of the applets on page http://java.sun.com/docs/books/tutorial/essential/threads/index.html of the tutorial generated errors, which may or may not indicate that the problem lies in my browsers; frankly, I'm not sure. Any help that you people can give me would be greatly appreciated!

Applets can not read from the filesystem unless you set up policy or sign the applet (or both)
http://forum.java.sun.com/thread.jsp?forum=63&thread=524815
second post
If you applet needs to read a file that is in the same location as the html file and applet why not use the
URL object?

Access denied on applet in broswer - fine in applet viewer

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)
Any help is appreciated.
The code is as follows:
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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

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?
All help very much apreciated, you are very nice people
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">
<title>Hello to Everyone</title>
</head>
<body>
<applet CODE="Hello.class" width=300 height=100>Hello Dolly
</applet>
</body>
</html>

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;
   public void init()
      b=new Button("the button");
      add(b);
      b.addActionListener(this);
      System.out.println("init ok");
   public void actionPerformed(ActionEvent e)
      System.out.println("actionPerformed start");
      PopupMenu p;
      p=new PopupMenu("Jalla");
      p.add(new MenuItem("first"));
      p.add(new MenuItem("second"));
      add(p);
      b.setBackground(new Color((int)(Math.random()*0xffffff)));
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      p.show(b, 10, 10);
      System.out.println("actionPerformed end");
}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

Applet viewer / mozills / netscape6 hang from time to time

hi list!
we are using a 3 tier setup
(db <--> forms server <--> client with appletviewer)
the database server runs on solaris, the forms server and the clients are running debian stable (woody) (clients use j2sdk1.3)
the forms server is version 9.2. from time to time the applet viewer (or mozilla or netscape; doesnt matter) just hang. from time to time here means like 4 times in the last 2 weeks. the progress indicator in the right lower corner moves from side to side but nothing happens, the gui doesnt get updated anymore and i have to kill the task and any uncommited info is lost :((( . in the server logs i can find this:
[Thu Nov 14 11:55:18 2002 CET]::Client Status [ConnId=0, PID=647]
>> Network connection to client failed: timeout on connection
Possible causes include a network failure or client termination
well, i know that its not a hardware prob since with a 8i client installed everything works perfectly.
i have also tried to use j2sdk1.4 from sun.com but the appletviewer from this version behaves very strangely and keyboard input is often being misinterpreted.
what is considered the most stable client setup for linux clients?
am i overseeing something?
do i have to make any special configuration on the clients?
best regards, armin

Hi, think you need on your DVD/CD :
QuickTime and MPEG-4 movie files that end in ".mov", ".m4v", or ".mp4" and are playable in QuickTime Player.
Please read:
iTunes: Frequently asked questions about viewing and syncing videos
i hope it helps
regards

PIctures in applet viewer

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 ...
// <applet code='ACoolerAppletSimple' width='400' height='300'></applet>
                            import java.applet.*;
                            import java.awt.*;
                            import java.net.*;
                            public class ACoolerAppletSimple extends Applet {
                              private Image bigGIF;
                              public void init() {
                                String gif = this.getCodeBase().toString() + "T1.gif";
                                try {
                                  bigGIF = this.getImage(new URL(gif));
                                catch (MalformedURLException e) { }
                              public void paint(Graphics g) {
                                  g.drawImage(bigGIF, 0, 0, this);
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JMF works in Applet View, but in web browser, cannot find device

I'm developing an Applet which can capture image from a web camera.
It's working very well in the applet view, but it says "No devices" error message through web browser.
How can I make it work? How can I find device on the web browser?
I changed permission using "java JMFRegistry", and tried signed Jar.
Anyone can help me?
or some of samples would be appreciated...

Applet view means Applet viewer..

Runtime error in Applet only appears when running through IDE applet viewer

Java 5.0
Netbeans 4.1
Linux (Suse 9.3)
I only started getting this error when I set the data loading and initialization classes into a separate thread. (the data loading and init is currently just using dummy test data within the class, nothing is loaded from external files as of yet)
Exception in thread "J3D-MasterControl" java.lang.NullPointerException
        at javax.media.j3d.SoundScheduler.activate(SoundScheduler.java:714)
        at javax.media.j3d.MasterControl.viewActivate(MasterControl.java:2539)
        at javax.media.j3d.MasterControl.handlePendingRequest(MasterControl.java:3032)
        at javax.media.j3d.MasterControl.doWork(MasterControl.java:2956)
        at javax.media.j3d.MasterControlThread.run(MasterControlThread.java:28)This error only comes up about 50% of the time, and only when I run it within the IDE applet viewer. I've never gotten this error when I run it from a web browser (tested with IE, Firefox and Opera).
Is this an error I should be worried about, since it only comes up within the IDE?

Chana_R wrote:
Thanks for the reply. I am new to this topic area (though pretty good a programming in general...), so forgive me the query below is offbase.
The applet is unsigned. For what it is worth, the applet code and the database are stored on the same machine. However, I can see where a client running the applet is a remote user and so the system may view this as a different source of code (IP/DNS).User has nothing to do with it.
>
I am currently to the point I can run the applet on my own server's browser, but cannot access the applet via a remote browser. I get an java.lang.NullPointerException
     at JdbcTest.init(JdbcTest.java:40)
     at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Would this be typical of the problem you describe?
No. You will get an exception for the problem I discussed. The problem you have suggests either something else is wrong or you are eating an exception and then attempting to continue.
And secondly, what is a reasonably safe (and yet free!) method to deal with this? Is there a way to handle through java.policy or should I sign the applet? I've never worked with signed applets...but I can certainly start reading up on the topic...Signing the applet is easier in terms of distribution. Policy change is quicker if you are just messing around or if you have a very limited distribution target.

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