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Thread: Java.security.AccessControlException

  1. #1
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    Default Java.security.AccessControlException

    Hai all,

    I am developing an applet which performs the Pinging operation using command prompt.

    Here I am giving the Code of my applet.

    import java.awt.*;
    import javax.swing.*;
    import java.applet.*;
    import java.io.*;
    import java.awt.event.*;
    public class applet1 extends Applet implements ActionListener{
    String str;
    public static TextArea area;
    public static TextField ipaddress;
    public void init(){
    str = "this is my first Applet";
    Label label = new Label("Enter IP Address");
    add(label);
    ipaddress = new TextField(20);
    add(ipaddress);
    Button submit = new Button("Ping");
    add(submit);
    area = new TextArea(20,40);
    add(area);
    submit.addActionListener(this);
    setBackground(Color.gray);
    }
    public void paint(Graphics g){
    showStatus("pinging.....");
    }
    public void actionPerformed(ActionEvent ae){
    String ip = ipaddress.getText();
    String pingResult = "";
    String pingCmd = "ping " + ip;
    try {
    Runtime r = Runtime.getRuntime();
    Process p = r.exec(pingCmd);
    BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream()));
    String inputLine = null;
    while ((inputLine = in.readLine()) != null) {
    area.append(inputLine+"\n");
    pingResult += inputLine;
    }
    in.close();
    }
    catch (IOException e) {
    System.out.println(e);
    }
    }
    }



    This code is generating an exception as shown in the image.



    Java.security.AccessControlException-exception.png


    Can anybody fix this for me?step3b_fail.jpg

    Thanks in advance.
    Last edited by ramanareddy438; December 13th, 2011 at 05:57 AM.

  2. #2
    Think of me.... Mr.777's Avatar
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    Default Re: Java.security.AccessControlException

    Java.security.AccessControlException-exception.png
    Why don't you try reading about the exception? You don't have access by OS to do this.

  3. #3
    Administrator copeg's Avatar
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  4. #4
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    Default Re: Java.security.AccessControlException

    The default permissions for applet is very limited, so you should either have a .java.policy file or sign the applet using a certificate to give it the required permission.

    Spring 3
    Last edited by cafeteria84; January 22nd, 2012 at 04:05 PM.

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