Could not find page: "+ page + "

/**
*Class JavaBrowser is an Applet 
*functioning as a interpreting browser.
*Internet Programming 1 - Course
*@author Martin Carlsson
*/
import javax.swing.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import java.net.*;


public class JavaBrowser extends JApplet {

private JTextField urlField; 	 
private JLabel jl;
private JEditorPane jep;	
private String defaultUrl; // default start page	

    public void init() {
        defaultUrl = getCodeBase() + "browserAppletTest.htm";
        //Container to put the graphical components in.
        Container con = getContentPane();
        jep = new JEditorPane();
        jep.setEditable(false);
        JScrollPane scrollPane = new JScrollPane(jep);
        con.add(scrollPane,BorderLayout.CENTER);
        jep.addHyperlinkListener(new LinkTrace(jep));
        JPanel up = new JPanel();
        up.setLayout(new FlowLayout(FlowLayout.LEFT));
        up.setBackground(Color.lightGray);
        up.add(jl = new JLabel("adress"));
        up.add(urlField = new JTextField(55));
        urlField.setText(defaultUrl);
        urlField.requestFocus();
        urlField.addActionListener(new EnterListener()); //Listener for the URL field
        con.add(up, BorderLayout.NORTH);	
        
        //Tries to retrieve the default URL
        try {
            jep.setPage(defaultUrl);
        }
        catch(IOException e) {
            jep.setContentType("text/html");
            jep.setText("<html>Can't find page!</html>");
        }
    }//end init()
    
    /**
    Listener class for the URL field. Information will be retrieved from the address
    currently in the URL field when the enter button is pressed.
    */
    class  EnterListener implements ActionListener{
        public void actionPerformed(ActionEvent ae) {
            String domain = getCodeBase().getHost().toString();
            String page = urlField.getText().trim();
            if(page.startsWith("http://"+domain)) {
            try {
            jep.setPage(urlField.getText().trim());
            }
            catch(IOException ioe) {
                jep.setContentType("text/html");
                jep.setText("<html><h1>Could not find page: "+ page + "</h1></html>");
            }
        }
        else
            jep.setText("<html><h1>Illegal!Not within the domain: " + domain +"</h1></html>");
        }
    }//End class EnterListener
}//End class JavaBrowser