Works correctly on IDE but crashes on web

Question

Hi,
My applet and server app receive and send messages correctly if i run my apps on eclipse or idea. I have created a jar for client applet. But on web client doesnt receive any messages. I dont know where i am wrong.
These are related SERVER codes. I hope they will be enough.
ClientConnection implements Runnable {
private Socket sock;
private BufferedReader in;
//private OutputStream out;
private String host;
private Server server;
private Writer writer;
private static final String CRLF = "\r\n";
private String name = null ;
private String id;
private boolean busy = false;
public ClientConnection(Server srv, Socket s, int i) {
try {
server = srv;
sock = s;
in = new BufferedReader(new InputStreamReader(s.getInputStream()));
//out = s.getOutputStream();
this.writer = new OutputStreamWriter(s.getOutputStream(), "UTF-8");
host = s.getInetAddress().getHostName();
id = "" + i;
write(
"id " + id + CRLF );
new Thread(this).start();
catch (IOException e) {
System.
out.println("failed ClientConnection " + e);
public
void write(String s) {
char buf[];
buf = s.toCharArray();
try {
this.writer.write(buf, 0, buf.length );
writer.flush();
catch (IOException e) {
close();
public
void write(char cbuf[], int off, int len) throws IOException {
try{
for (int i = 0; i < len; i++) {
char c = cbuf[off + i];
if (c != '\r')
buf.append(c);
if (c == '\n') {
synchronized (out) {
out.write(buf.toString());
System.
out.println("send "+ buf.toString());
buf.setLength(0);
buf.append(channel);
catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
//some of related CLIENT Codes
this
.reader = new BufferedReader( new InputStreamReader(this.socket
.getInputStream(), "UTF-8"), 1);
public ChannelReader(int channel, TavServerConnection conn) {
this.channel = channel;
this.connection = conn;
connection.addChannelListener(this);
public ChannelReader(int channel) {
this.channel = channel;
private StringBuffer buf = new StringBuffer();
public synchronized int read(char[] cbuf, int off, int len)
throws IOException {
if (buf == null ) {
return -1;
while (buf.length() == 0) {
try {
wait();
catch (InterruptedException ex) {
IOException iox =
new InterruptedIOException();
iox.initCause(ex);
throw iox;
int cnt = Math.min(len, buf.length());
buf.getChars(0, cnt, cbuf, off);
buf.delete(0, cnt);
return cnt;
}----------------------------------

Answer 1

Applets are "active content" and thus run in a sandbox on the host machine with limited abilities and security permissions.
Change the security settings on your browser to allow I/O, networking for your applet.