Creating signed Java applet for Netscape 4x

I have created a signed jar with SuperUser privileges under Netscape.
public void init() {
try {
if( Class.forName("netscape.security.PrivilegeManager") != null ) {
netscape.security.PrivilegeManager.enablePrivilege("SuperUser");
} catch( ClassNotFoundException cnfe ) {
cnfe.printStackTrace();
With this I am getting following error without any dailog prompting to grant permission.
netscape.security.ForbiddenTargetException: User didn't grant the SuperUser privilege.
Please help.
Thanks
Satish

Then it's likely Netscape 4.x doesn't recognize the jar as being signed. How did you sign the jar?
Why didn't you ask this in the more appropriate Signed Applets forum?

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Signed Applet for Netscape 4x

I have created a signed jar with SuperUser privileges under Netscape.
public void init() {
try {
if( Class.forName("netscape.security.PrivilegeManager") != null ) {
netscape.security.PrivilegeManager.enablePrivilege("SuperUser");
} catch( ClassNotFoundException cnfe ) {
cnfe.printStackTrace();
With this I am getting following error without any dailog prompting to grant permission.
netscape.security.ForbiddenTargetException: User didn't grant the SuperUser privilege.
Please help.
Thanks
Satish

Hi,
this is exactly the same problem I am facing here. Each time I try to grant/enable a capability, it is automatically denied without any dialog. Do we forget something?
I only signed the applet with the netscape signtool, not with a real certificate from verisign or such, does that matter?
Please let me know if you found out how to do it.
SkyScrap

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START OF DOC
How To Sign a Java Applet
The purpose of this document is to document the steps required to sign and use an
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The original 9 steps of this process were posted by user irene67 on suns message forum:
http://forums.java.sun.com/thread.jsp?forum=63&thread=132769
-----begin irene67's original message -----
These steps describe the creation of a self-signed applet. This is useful for testing purposes. For use of public reachable applets, there will be needed a "real" certificate issued by an authority like VeriSign or Thawte. (See step 10 - no user will import and trust a self-signed applet from an unkown developer).
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It is not necessary to set any permissions or use security managers in
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Password for the keystore is any password. Only Sun knows why...
perhaps ;-)
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Enter keystore password: *******
What is your first and last name?
[Unknown]: Your Name
What is the name of your organizational unit?
[Unknown]: YourUnit
What is the name of your organization?
[Unknown]: YourOrg
What is the name of your City or Locality?
[Unknown]: YourCity
What is the name of your State or Province?
[Unknown]: YS
What is the two-letter country code for this unit?
[Unknown]: US
Is CN=Your Name, OU=YourUnit, O=YourOrg, L=YourCity, ST=YS, C=US
correct?
[no]: yes
(wait...)
Enter key password for tstkey
(RETURN if same as keystore password):
(press [enter])
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Enter keystore password: *******
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Thu Jul 27 12:58:28 GMT+02:00 2000 META-INF/
68 Thu Jul 27 12:58:28 GMT+02:00 2000 META-INF/MANIFEST.MF
849 Thu Jul 27 12:49:04 GMT+02:00 2000 tst.class
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130 Thu Jul 27 13:04:12 GMT+02:00 2000 META-INF/MANIFEST.MF
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920 Thu Jul 27 13:04:12 GMT+02:00 2000 META-INF/TSTKEY.RSA
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i = at least one certificate was found in identity scope
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10. (Omitted See Below)
-----end irene67's original message -----
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For JDK 1.3.0_02: C:\Program Files\JavaSoft\JRE\1.3.0_02\lib\security
For JDK 1.3.1: C:\Program Files\JavaSoft\JRE\1.3.1\lib\security
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NOTE: Unless otherwise specified by the -keystore command in all keytool and jarsigner operations, the keystore file used is named '.keystore' in the user's home directory.
The first time any keystore is accessed (including the default) it will be created and secured with the first password given by the user. There is no way to figure out the password if you forget it, but you can delete the default file and recreate it if necessary. For most operations, using the -keystore command is safer to keep from cluttering or messing up your default keystore.

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<HTML>
<HEAD>
<TITLE>Morphing Applet</TITLE>
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</APPLET>
</BODY>
</HTML>
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java.security.cert.CertificateException: Unable to verify the certificate with root CA
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     at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:111)
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     at java.lang.ClassLoader.loadClass(ClassLoader.java:253)
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     at sun.applet.AppletPanel.createApplet(AppletPanel.java:579)
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     at sun.applet.AppletPanel.runLoader(AppletPanel.java:515)
     at sun.applet.AppletPanel.run(AppletPanel.java:293)
     at java.lang.Thread.run(Thread.java:484)
java.lang.ExceptionInInitializerError: java.security.AccessControlException: access denied (java.lang.RuntimePermission modifyThreadGroup)
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(getParameter(key) != null ? getParameter(key) : def);
/**Construct the applet*/
public GUI_RMIApplet() {
/**Initialize the applet*/
public void init() {
try {
jbInit();
} catch (Exception e) {
System.out.println("GUI_RMI exception: " + e.getMessage());
e.printStackTrace();
/**Component initialization*/
private void jbInit() {
// Main bulk for this applet
GUI gui = new GUI();
gui.setVisible(true);
public void paint(Graphics g) {
g.drawString(message, 25, 50);
/**Get Applet information*/
public String getAppletInfo() {
return "Applet Information";
/**Get parameter info*/
public String[][] getParameterInfo() {
return null;
//static initializer for setting look & feel
static {
try {
//UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
//UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
catch(Exception e) {
And, the GUI.java class calls these funcitons when exit menu button is selected:
GUI.this.dispose(); // disposes the frame
System.exit(-1); // disposes the applet (?or not?)
I think the System.exit button is messing things up but I don't know what other function I can use to close teh applet.
Hope this is enough information.

Signed Java Applet

0 down vote favorite
I have written an applet with Netbeans. When I click on Clean and Build then Netbean create a jar file "Test.jar" and also another folder called lib in the same directory. I've signed the Test.jar. Basically this applet upload files to server with FTP. So when Applet loads into browser then I am able to select files but when I click on upload then it stops. So my question is:
1. Have I also need to sign all dependent jar files?
2. My directory structure is as follow:
C:\AppletPage.html C:\Test.jar C:\lib
and code in html file is as follow
<applet code="UploadGUI.class"
archive="test.jar"
width=400 height=400></applet>Please advice me where am I wrong?
Thanks in Advance

Shahid_Hanif wrote:
0 down vote favoriteHuhh?
I have written an applet with Netbeans. ..My condolences.
..lWhen I click on Clean and Build then Netbean create a jar file "Test.jar" and also another folder called lib in the same directory. I've signed the Test.jar. Basically this applet upload files to server with FTP. ..If you deploy the applet in a Plug-In 2 architecture JRE and launch it using Java Web Start - it can be sand-boxed.
..So when Applet loads into browser then I am able to select files but when I click on upload then it stops. .. What messages appear in the Java Console? Does the code of the applet [swallow exceptions|http://pscode.org/javafaq.html#stacktrace] (<- link)?
..So my question is:
1. Have I also need to sign all dependent jar files?What dependent Jars? The applet element shown lists only one Jar in the archive attribute.
2. My directory structure is as follow:
C:\AppletPage.html C:\Test.jar C:\libWhat (if anything) is in 'lib'?
Edit 1:
Also posted to [http://stackoverflow.com/questions/3740006/java-applet-sign]
Edited by: AndrewThompson64 on Sep 18, 2010 1:07 PM

Java applet for Creditcard Validation

Can anyone recommend a site which provides an example/source code for a JAVA applet which would have the following minimum requirements:
1) Input for creditcard type
2) Input for cc expiry
3) Input for cc number
4) Luhn 10 validation
5) Validation that cc type matches syntax for cc number
There doesn't seem to be any examples that I could find.
Thanx in advance...
Warren

i dont think any one will use this, as you will need to sign the applet first which costs you some amount and for credit card verification also you need to pay some amount so the amount is double when compared to using HTML in your site.

Java Applets in Netscape with EMBED tag

Hi,
I tried to run the examples on the:
http://192.9.48.9/products/plugin/1.3/demos/applets.html
Demo paged off of the plug page and in Netscape 4.08 it
does not know there is a plugin , in Netscape 6.0
it knows there is a plug in but won't use the one installed on the machine (1.3.1) which is the same level as the demo.
Any clues how to get applets to use the Java Plugin with Netscape? This works fine in IE
Thanks!
BTW- I'm using NT 4.0 os.

Probably 1.3.1 conflicts with 1.3.1_01 or 1.3.1_02.
You need the HTML Converter from the Java PlugIn download page to make your page ready for Netscape 4.x. Go to http://java.sun.com/products/plugin/1.3/converter.html (Java Plug-in HTML Converter Download) to download your copy of the HTML Converter. Watch for the current version, it is 1.3, not 1.1.1.
Download your page, strip out the <embed/> and <object/> elements, uncomment the <applet/> element and run the HTML Converter.
Additional Information:
Netscape 6 does not use the <embed/> element anymore since it isn't a html element but was a proprietary netscape tag. Netscape 6 uses the <object/> element like Internet Explorer and Opera.
Another note on <embed/>:
Use of <embed/> is strongly discouraged, but there's no other chance. Let's hope support for Netscape 4.x won't be neccessary any more in a few months.
A note on <applet/>:
The <applet/> element is deprecated since HTML 4.01 or earlier (http://www.w3.org/TR/html401/struct/objects.html Objects in HTML 4). One should use the <object> element instead anyway. The semantic description of html elements found in the technical report of the html 4.01 recommendation is still valid for current html versions of today (XHTML 1.1 and XHTML Basic 1.0).
There's also a funny page of Sun about HTML: http://java.sun.com/products/plugin/1.3/docs/tags.html. Don't take that page too serious since it states it is talking about HTML, but it isn't.
If you use the HTML Converter, be sure to use the Extended (Standard + All Browsers/Platforms) template to tell Netscape, Opera and Internet Explorer regardless of the used version to display the applet correctly. But watch out: the generated code is not HTML and will perhaps even crash your page in Internet Explorer 6 and browsers that rely on the HTML standard! It also won't work with Netscape 6 if there is a different version of the Java Plugin installed more recently than the requested. I have SDK 1.3, 1.3.1 and 1.4 installed, and Netscape 6 wants to download the 1.3.1 Plugin.
The best way to make your applet work in really every browser is to study what the converter is trying to do and code it by yourself in a conformant way. Be sure not to tell the browser the Plugin version to use to avoid the neccessarity of downloading outdated plugins and installing several plugins (1.2, 1.2.1, 1.2.2, 1.3, 1.3.1, 1.3.1_01, 1.3.1_02, 1.4...).

I can't run signed Java Applets

HI
I have a java applet where I need to have acces to a local file, but I can't get IE to run the applet. (IE do not come with the Secutiy Warning window.)
From the homepage, I run the applet via:
<applet name=read_file code="read_file.class" width="0" height="0">
<script language="JavaScript">
document.read_file.file_read();
</script>
And the java code is:
import java.applet.*;
import java.awt.*;
import java.io.*;
public class read_file extends Applet{
     public char[][] ip;
     public int counter;
     public String te="dette er en java test";
public void init() {
public void file_read() {
     String str;
     counter =0;
     try {
     BufferedReader in = new BufferedReader(new FileReader("c:\test\config.txt"));
          while ((str = in.readLine()) != null){
               ip[counter] = str.toCharArray();
               counter++;
          in.close();
     } catch(IOException e) {
public void test() {
I have signed the cab file with:
"C:\Program Files\Microsoft.NET\SDK\v1.1\Bin\signcode.exe" -j "C:\Program Files\Microsoft.NET\SDK\v1.1\Bin\JAVASIGN.DLL" -jp High -v hjl.pvk -spc hjl.spc -n "oil" -i "www.vedikke endnu-.dk" "C:\Documents and Settings\rbn\Desktop\UIp\hjemmeside\read_file.cab"
and maket the cab fil with:
"C:\Documents and Settings\rbn\Desktop\UIp\cab\BIN\MAKECAB.EXE" "C:\Documents and Settings\rbn\Desktop\UIp\java\read_file.class" "C:\Documents and Settings\rbn\Desktop\UIp\hjemmeside\read_file.cab"
What do I need to different ?

I see no reason why you want to make this applet for the msjvm, here is how you do it with the sun sdk:
Signing applets:
http://forum.java.sun.com/thread.jsp?forum=63&thread=524815
second post and last post for the java class file
http://forum.java.sun.com/thread.jsp?forum=63&thread=409341
4th post explaining how to set up your own policy with your own keystore
(my copy and paste fingers are really getting tired now, copyd and pasted this
for about a 100 times now)
Notice some differences in the html code of the examples (they don't use the applet tag)
If you're aiming for the msjvm because you don't want any support form MS in
the near future and want to delever a legacy unsupported unmaintainable applet
than I have to ask you how you compiled the applet. If you used the SUN sdk
then are you aware that the msjvm cannot handle java version higher than 1.1?
So you have to compile it like this: javac -source 1.3 -target 1.1 ....
Your html file seems to be missng the cabbase value so how do you expect
IE to find the cab file?

Creating signed Java applet for Netscape 4x

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