Another Applet Not Initializing.

[J R Hatch]

Hi. I have written a panel which does what I want it to when invoked from a frame run on command line like this:

package jtsuro;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
import java.net.*;
import javax.swing.text.*;
/**
 *
 * @author gameplayer
 */
public class TsuroChatFrame extends javax.swing.JFrame  {  

	public TsuroChatFrame() {
	setVisible(true);  
		
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
    	setTitle("Chatting");
	setMinimumSize(new Dimension (600,600));
	TsuroChatPanel newContentPane = new TsuroChatPanel();
        newContentPane.setOpaque(true); 
        setContentPane(newContentPane);
	      
	}

	
	public static void main(String args[]) throws IOException { 
		{
			new TsuroChatFrame().setVisible(true);
            		
		}
	}

}

but which never initializes when I try to load it as an applet using the code

package jtsuro;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
import java.net.*;
import javax.swing.text.*;
/**
 *
 * @author gameplayer
 */
public class TsuroChatApplet extends javax.swing.JApplet {  
    public void init() {
        try {
            SwingUtilities.invokeAndWait(new Runnable() {
                public void run() {
                    createGUI();
                }
            });
        } catch (Exception e) { 
            System.err.println("createGUI didn't complete successfully");
        }
    }
    
    private void createGUI() {
        //Create and set up the content pane.
        TsuroChatPanel newContentPane = new TsuroChatPanel();
        newContentPane.setVisible(true); 
        setContentPane(newContentPane);        
    }        
}

So, can anyone tell me what I'm missing? I've tried looking at the errors in the java console, but it's just a bunch of warnings about zooms and ignoring things, no actual errors.


If it matters, I've included the chatpanel code here:

package jtsuro;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
import java.net.*;
import javax.swing.text.*;
/**
 *
 * @author gameplayer
 */
public class TsuroChatPanel extends javax.swing.JPanel implements ActionListener {  

	public TsuroChatPanel() {
      				  initComponents();
	}

	private void initComponents() {


     		setLayout(new BorderLayout(0,0));
		setMinimumSize(new Dimension (600,600));
		chatWindow = new JTextArea("Chat messages will appear here.\n",20,40);
		chatWindow.setEditable(false);
		chatScrollPane= new JScrollPane(chatWindow);
		chattingAs = new JLabel("You haven't picked a name yet");
		enterText=new JTextField(30);
		bottomPanel=new JPanel();
		bottomPanel.setLayout(new BoxLayout(bottomPanel, BoxLayout.PAGE_AXIS));	
		enterText.addActionListener(this);
		add(chatScrollPane, BorderLayout.CENTER);
		add(bottomPanel,BorderLayout.PAGE_END);
		bottomPanel.add(chattingAs);
		bottomPanel.add(enterText);
		sidePanel=new JPanel();
		sidePanel.setLayout(new BoxLayout(sidePanel, BoxLayout.PAGE_AXIS));	
		startGame=new JButton("Start a New Game of Tsuro");
		startGame.addActionListener(new java.awt.event.ActionListener() {
			public void actionPerformed(java.awt.event.ActionEvent evt) {
				startGameActionPerformed(evt);
			}
		});
		joinGame=new JComboBox();
		joinGame.setEnabled(false);
		sidePanel.add(startGame);
		sidePanel.add(joinGame);
		add(sidePanel,BorderLayout.LINE_END);
		
		setOpaque(true);

		piecesOfString=new String[2];
 
		try {
			tsuroSocket = new Socket("***", 14839);
			out = new PrintWriter(tsuroSocket.getOutputStream(), true);
			in = new BufferedReader(new InputStreamReader(tsuroSocket.getInputStream()));
		} catch (UnknownHostException e) {
			System.err.println("Don't know about host: *** .");
			System.exit(1);
		} catch (IOException e) {
			System.err.println("Couldn't get I/O for the connection to: ***.");
			System.exit(1);
		}


		clientThread=new TsuroChatClientThread(tsuroSocket,in,out);
		clientThread.start();
		              

	public void addChatLine(String text, String name) {
		chatWindow.append(name+": "+text+"\n");
	} 

	public void actionPerformed(ActionEvent evt) {
		if (!chattingYet) {
			String s = (String)JOptionPane.showInputDialog(this,"What name do you wish to use?","Pick Name");
			myName=s;
			chattingYet=true;
			chattingAs.setText("Chatting as "+myName);
		} else {
			out.println(enterText.getText()+"hoojiejon;!"+myName);
			enterText.setText("");
		}

	}

	private void startGameActionPerformed(java.awt.event.ActionEvent evt) {
		addChatLine("It seems that "+myName+" has started a new game of Tsuro.",myName);
		
	
	}
	




	protected JTextArea chatWindow;
	protected JLabel chattingAs;
	protected JTextField enterText;
	protected JPanel bottomPanel;
	protected JButton startGame;
	protected JComboBox joinGame;
	protected JPanel sidePanel;
	protected JScrollPane chatScrollPane;
	private boolean chattingYet=false;
	private String myName;
	private Socket tsuroSocket=null;
	private PrintWriter out=null;
	private BufferedReader in=null;
	private String fromServer;
	private String fromUser;
	private String[] piecesOfString;
	private TsuroChatClientThread clientThread;





	protected class TsuroChatClientThread extends Thread {
		private String message;
		private String name;
		private Socket tsuroSocket=null;
		private BufferedReader in=null;
		private PrintWriter out=null;

		public TsuroChatClientThread(java.net.Socket socket,java.io.BufferedReader br,java.io.PrintWriter pw) {
			tsuroSocket=socket;
			in=br;
			out=pw;
		}

		public void run() {
			try {
				while ((fromServer = in.readLine()) != null) {
					message=fromServer.split("hoojiejon;!")[0];
					name=fromServer.split("hoojiejon;!")[1];
					addChatLine((fromServer.split("hoojiejon;!"))[0],(fromServer.split("hoojiejon;!"))[1]);
	
		            		if (fromServer.equals("Bye."))
	                		break;
				}
				out.close();
				in.close();
				tsuroSocket.close();
			} catch (Exception ex) {
			ex.printStackTrace();
			}

		}
	}
}

[Paul Clapham]

Applets aren't allowed to connect to any server other than the one they were loaded from, unless they are signed. Your code appears to be trying to connect to a socket. That's most likely the problem.

[J R Hatch]

Paul Clapham wrote:Applets aren't allowed to connect to any server other than the one they were loaded from, unless they are signed. Your code appears to be trying to connect to a socket. That's most likely the problem.

I can see that causing a problem in the future, if I were to try to deploy this so that others can log into my chat server, but right now this panel is trying to connect to a server on the same network card (same computer, even). Would that still happen?

[Paul Clapham]

I said "the same server it was loaded from"; "server" in that phrase refers to a piece of software. Connecting to a different server on the same server constitutes connecting to a different server.

And if you're asking if that was actually the problem, you should be able to look at the Java console and see the error message which is thrown when you fail to connect to the server.

[J R Hatch]

Paul Clapham wrote:I said "the same server it was loaded from"; "server" in that phrase refers to a piece of software. Connecting to a different server on the same server constitutes connecting to a different server.

And if you're asking if that was actually the problem, you should be able to look at the Java console and see the error message which is thrown when you fail to connect to the server.

I see. Where can I get more details on "signing" the applet or server so I can run a chat program?

I guess I was not looking at the java console. I was looking at the web developer error console.

[Matthew Brown]

Paul Clapham wrote:Connecting to a different server on the same server constitutes connecting to a different server.

Isn't language wonderful

[Paul Clapham]

I could have sworn that I typed

Paul Clapham should have wrote:Connecting to a different server on the same computer constitutes connecting to a different server.

But evidently I didn't.

Anyway, to answer your question about where to find out about signing applets, I predict that the google keywords "applet signing tutorial" will lead you directly to Oracle's tutorials about applets.