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Java – Applet doesn’t work on Firefox when usign ForkJoinPool (while in Eclipse works)

  • 3 replies
  • 2 have this problem
  • 4 views
  • Last reply by Farco

Farco
Farco
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when I run the following code on Eclipse (Luna, java vers=8), the code runs and pops-up the two errors messages. On the other hand, when I embed the code in a html page the code shows only the first error message. It seems that calling the ForkJoinPool class crushes the applet on firefox. Do you know why? Here is the code.

import java.awt.BorderLayout; import java.awt.Container; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.util.concurrent.ForkJoinPool;

import javax.swing.JApplet; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.SwingUtilities;

public class ProvaVera extends JApplet { 

   public void start() 
   {

       SwingUtilities.invokeLater(new Runnable(){
       public void run() 
           {
               MainPanel panel = new MainPanel();      
               // Add Swing components to content pane
               Container c = getContentPane();
               c.add(panel, BorderLayout.CENTER);
           }
       });

   }

} class MainPanel extends JPanel { 

   public MainPanel()
   {
       JLabel label1 = new JLabel("label1");
       this.add(label1);
       JButton btn1 = new JButton("button1");
       this.add(btn1);

       btn1.addActionListener  (
               new ActionListener() 
               {
                   public void actionPerformed(ActionEvent e)
                   {
                       metodo();
                   }
               }

               );
   }



   public void metodo()
   {
       JOptionPane.showMessageDialog(new JFrame(), "test1", "Dialog", JOptionPane.ERROR_MESSAGE);
       ForkJoinPool pool = new ForkJoinPool();
       JOptionPane.showMessageDialog(new JFrame(), "test2", "Dialog", JOptionPane.ERROR_MESSAGE);
   }

}


and here there is the index.html file that embeds the java applet

<applet code="ProvaVera.class" width="800" height="680" <param name="permissions" value="all-permissions" />> </applet>


Thank you in advance

when I run the following code on Eclipse (Luna, java vers=8), the code runs and pops-up the two errors messages. On the other hand, when I embed the code in a html page the code shows only the first error message. It seems that calling the ForkJoinPool class crushes the applet on firefox. Do you know why? Here is the code. import java.awt.BorderLayout; import java.awt.Container; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.util.concurrent.ForkJoinPool; import javax.swing.JApplet; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.SwingUtilities; public class ProvaVera extends JApplet { public void start() { SwingUtilities.invokeLater(new Runnable(){ public void run() { MainPanel panel = new MainPanel(); // Add Swing components to content pane Container c = getContentPane(); c.add(panel, BorderLayout.CENTER); } }); } } class MainPanel extends JPanel { public MainPanel() { JLabel label1 = new JLabel("label1"); this.add(label1); JButton btn1 = new JButton("button1"); this.add(btn1); btn1.addActionListener ( new ActionListener() { public void actionPerformed(ActionEvent e) { metodo(); } } ); } public void metodo() { JOptionPane.showMessageDialog(new JFrame(), "test1", "Dialog", JOptionPane.ERROR_MESSAGE); ForkJoinPool pool = new ForkJoinPool(); JOptionPane.showMessageDialog(new JFrame(), "test2", "Dialog", JOptionPane.ERROR_MESSAGE); } } and here there is the index.html file that embeds the java applet <html> <body> <applet code="ProvaVera.class" width="800" height="680" <param name="permissions" value="all-permissions" />> </applet> </body> </html> Thank you in advance

All Replies (3)

Oxylatium
Oxylatium
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Please, could provide a self-contained minimal testcase working on a public page., so we could test on our side.

Farco
Farco Question owner
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Hello Oxylatium thank you for your answer,

as you said I put the example on a public page: 

     http://latastiera.altervista.org/

but it seems that it does NOT work.

Modified by Farco

Farco
Farco Question owner
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I have enabled the Java console from the java control panel. And the error was: java.security.AccessControlException: access denied ("java.lang.RuntimePermission" "modifyThread")

So I went to my java.policy file located in java.home/lib/security/ and I wrote the following

grant codeBase "url or file where the applet is" { permission java.lang.RuntimePermission "modifyThread"; };

And now the applet is working.

Again, thank you for your support.