SocketPermission

[Jochem Gruter]

Hello,

I made a client-server based multiplayer game with java. When I run the client in eclipse it works fine. But when I run the game in a browser I got this error:

c:\**********>Appletviewer -J-Dos400.awt.native=true -J-Djava.version=1.5 launch.html
Exception in thread "Thread-5" java.security.AccessControlException: access denied (java.net.SocketPermission ***ip*****:7777 connect,resolve)
at java.security.AccessControlContext.checkPermission(AccessControlContext.java:323)
at java.security.AccessController.checkPermission(AccessController.java:546)
at java.lang.SecurityManager.checkPermission(SecurityManager.java:532)
at java.lang.SecurityManager.checkConnect(SecurityManager.java:1034)
at java.net.Socket.connect(Socket.java:524)
at java.net.Socket.connect(Socket.java:478)
at java.net.Socket.<init>(Socket.java:375)
at java.net.Socket.<init>(Socket.java:189)
at net.Connection.send(Connection.java:22)
at client.Castle.run(Castle.java:83)
at java.lang.Thread.run(Thread.java:662)

How can I solve this?

[Paul Clapham]

Applets need to be signed if they want to connect to sockets. So, sign the applet.

[Jochem Gruter]

Paul Clapham wrote:Applets need to be signed if they want to connect to sockets. So, sign the applet.

I did this:

keytool -genkey -keyalg rsa -alias MyCert

jar -cf myapplet.jar client/Castle.class

jarsigner myapplet.jar MyCert

but won't work.

[Paul Clapham]

Jochem Gruter wrote:won't work.

That could mean a lot of different things. Read this: TellTheDetails.

[Jochem Gruter]

The client is just sending sockets to the server and the server reply. This is the code to send a socket (client side):

static InetAddress host;
	
    public static String[] send(String msg){
        try {
        	if (host == null) host = InetAddress.getByName("86.85.9.156");
        	
            Socket socket = new Socket(host.getHostName(), 7777);

            ObjectOutputStream oos = new ObjectOutputStream(socket.getOutputStream());
            oos.writeObject(msg);

            ObjectInputStream ois = new ObjectInputStream(socket.getInputStream());
            String message = (String) ois.readObject();
            
            ois.close();
            oos.close();
            return message.split(";");
        } catch (UnknownHostException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        return null;
    }

And here the code from the server that receive the sockets and reply:

public ConnectionHandler(Socket socket) {
        this.socket = socket;

        Thread t = new Thread(this);
        t.start();
    }

    public void run() {
        try
        {
            ObjectInputStream ois = new ObjectInputStream(socket.getInputStream());
            String message = (String) ois.readObject();
            System.out.println("Message Received: " + message);

            ObjectOutputStream oos = new ObjectOutputStream(socket.getOutputStream());
            
            String command = message.indexOf(":") == -1 ? message : message.substring(0, message.indexOf(":"));
            String[] parameters = message.substring(message.indexOf(":")+1).split(";");
            
            if (command.equals("Something...")){
            	oos.writeObject("Something back");
            	
            }

            ois.close();
            oos.close();
            socket.close();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }

[Rob Spoor]

That code may work, once you get the applet properly signed. If you're still getting that exception then it's not yet.

I'll move this thread to our Applets forum.