Signed JAR file won�t work on A Mac

Hello I am trying to run this java script on a Mac
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.table.*;
import java.io.*;
public class Applet1 extends Applet {
private FlowLayout flowLayout1 = new FlowLayout();
private JFileChooser jFileChooser1 = new JFileChooser();
public Applet1() {
try {
jbInit();
catch(Exception e) {
e.printStackTrace();
private void jbInit() throws Exception {
this.setLayout(flowLayout1);
this.add(jFileChooser1, null);
The signed jar works properly on pc and it doesn�t work on a Mac.
I am using JDK 2.5 and swing 1.1.1

What error are you getting?Swing: checked access to system event queue.
An exception occurred:
com.apple.mrj.JManager.JMAppletSecurityExc: security.checkread: /, /
     at com.apple.mrj.JManager.JMAppletSecurityOld.checkRead(JMAppletSecurityOld.java)
     at com.apple.mrj.JManager.JMAppletSecurityOld.checkRead(JMAppletSecurityOld.java)
     at java.io.File.exists(File.java)
     at javax.swing.filechooser.UnixFileSystemView.getRoots(FileSystemView.java:270)
     at javax.swing.plaf.metal.MetalFileChooserUI$DirectoryComboBoxModel.<init>(MetalFileChooserUI.java:683)
     at javax.swing.plaf.metal.MetalFileChooserUI.createDirectoryComboBoxModel(MetalFileChooserUI.java:666)
     at javax.swing.plaf.metal.MetalFileChooserUI.installComponents(MetalFileChooserUI.java:145)
     at javax.swing.plaf.basic.BasicFileChooserUI.installUI(BasicFileChooserUI.java:106)
     at javax.swing.JComponent.setUI(JComponent.java:258)
     at javax.swing.JFileChooser.updateUI(JFileChooser.java:1296)
     at javax.swing.JFileChooser.setup(JFileChooser.java:294)
     at javax.swing.JFileChooser.<init>(JFileChooser.java:270)
     at javax.swing.JFileChooser.<init>(JFileChooser.java:233)
     at Applet1.<init>(Applet1.java:13)
     at com.apple.mrj.JManager.JMAppletViewer_OLD.doLoadCode(JMAppletViewerOld.java)
     at com.apple.mrj.JManager.JMAppletViewer_OLD.setState(JMAppletViewerOld.java)
     at com.apple.mrj.JManager.JMViewerEvent.post(JMAppletViewerOld.java)
     at com.apple.mrj.JManager.AVDispatcherThread.run(JMAppletViewerOld.java)

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Welcome to the Sun forums.
Subject: My Applet Jar file doesn't work !! .
1) Note that one '!' denotes exclamation, whereas 2 or more often denotes a dweeb.
2) Since you are on your first post, I will point out that applets are an advanced topic, and should not be attempted by newbies.
3) "doesn't work" is very vague. It is likely to produce a reply like "maybe the applet is lazy - try flogging it".
Amera wrote:
..I have written this java applet :When posting code, code snippets, HTML/XML or input/output, please use the code tags. The code tags help retain the formatting and indentation of the sample. To use the code tags, select the sample and click the CODE button.
Also note that the most preferred form of code is an SSCCE *(<- link).* In an SSCCE, your would remove all but one button (if the actionPerformed fails with 6 or 7 buttons, trim it down to fail with just one or two.
i made a jar file :So does the applet work before you make the Jar file? Your post so far suggests the Jar file is the problem.
i created a file and named it MANIFEST.MF .i wrote inside it :
Main-Class: test
Then i placed it in a folder with the test.class .I created jar file using command line.
I entered the test.class path and then wrote this command :
jar cvfm myjar.jar MANIFEST.MF *.class
Then the jar file "myjar.jar" is created .
it's executed but this function "public void actionPerformed(ActionEvent e) " won't wrok.
i keep pressing the buttons but nothing is happening !!So you get 'no output in the console & no effect in the applet'?
What is the URL where I can see your applet failing?
As an aside, since Sun does not guarantee that applet clients will act on the showDocument command, even if it does not work, it would not be a 'bug'.
Edited by: AndrewThompson64 on Dec 28, 2009 11:18 AM

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The information on the following link is a little bit dated but it helped me to successfully install a testcertificate and sign an applet with it.
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hello ,
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i made a jar file :
i created a file and named it MANIFEST.MF .i wrote inside it :
Main-Class: test
Then i placed it in a folder with the test.class .I created jar file using command line.
I entered the test.class path and then wrote this command :
jar cvfm myjar.jar MANIFEST.MF *.class
Then the jar file "myjar.jar" is created .
it's executed but this function "public void actionPerformed(ActionEvent e) " won't wrok.
i keep pressing the buttons but nothing is happening !!
please help me .
Edited by: Amera on Dec 27, 2009 2:51 PM

Welcome to the Sun forums.
Subject: My Applet Jar file doesn't work !! .
1) Note that one '!' denotes exclamation, whereas 2 or more often denotes a dweeb.
2) Since you are on your first post, I will point out that applets are an advanced topic, and should not be attempted by newbies.
3) "doesn't work" is very vague. It is likely to produce a reply like "maybe the applet is lazy - try flogging it".
Amera wrote:
..I have written this java applet :When posting code, code snippets, HTML/XML or input/output, please use the code tags. The code tags help retain the formatting and indentation of the sample. To use the code tags, select the sample and click the CODE button.
Also note that the most preferred form of code is an SSCCE *(<- link).* In an SSCCE, your would remove all but one button (if the actionPerformed fails with 6 or 7 buttons, trim it down to fail with just one or two.
i made a jar file :So does the applet work before you make the Jar file? Your post so far suggests the Jar file is the problem.
i created a file and named it MANIFEST.MF .i wrote inside it :
Main-Class: test
Then i placed it in a folder with the test.class .I created jar file using command line.
I entered the test.class path and then wrote this command :
jar cvfm myjar.jar MANIFEST.MF *.class
Then the jar file "myjar.jar" is created .
it's executed but this function "public void actionPerformed(ActionEvent e) " won't wrok.
i keep pressing the buttons but nothing is happening !!So you get 'no output in the console & no effect in the applet'?
What is the URL where I can see your applet failing?
As an aside, since Sun does not guarantee that applet clients will act on the showDocument command, even if it does not work, it would not be a 'bug'.
Edited by: AndrewThompson64 on Dec 28, 2009 11:18 AM

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Welcome to the Sun forums.
Subject: My Applet Jar file doesn't work !! .
1) Note that one '!' denotes exclamation, whereas 2 or more often denotes a dweeb.
2) Since you are on your first post, I will point out that applets are an advanced topic, and should not be attempted by newbies.
3) "doesn't work" is very vague. It is likely to produce a reply like "maybe the applet is lazy - try flogging it".
Amera wrote:
..I have written this java applet :When posting code, code snippets, HTML/XML or input/output, please use the code tags. The code tags help retain the formatting and indentation of the sample. To use the code tags, select the sample and click the CODE button.
Also note that the most preferred form of code is an SSCCE *(<- link).* In an SSCCE, your would remove all but one button (if the actionPerformed fails with 6 or 7 buttons, trim it down to fail with just one or two.
i made a jar file :So does the applet work before you make the Jar file? Your post so far suggests the Jar file is the problem.
i created a file and named it MANIFEST.MF .i wrote inside it :
Main-Class: test
Then i placed it in a folder with the test.class .I created jar file using command line.
I entered the test.class path and then wrote this command :
jar cvfm myjar.jar MANIFEST.MF *.class
Then the jar file "myjar.jar" is created .
it's executed but this function "public void actionPerformed(ActionEvent e) " won't wrok.
i keep pressing the buttons but nothing is happening !!So you get 'no output in the console & no effect in the applet'?
What is the URL where I can see your applet failing?
As an aside, since Sun does not guarantee that applet clients will act on the showDocument command, even if it does not work, it would not be a 'bug'.
Edited by: AndrewThompson64 on Dec 28, 2009 11:18 AM

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