Hi all,
When my program run:

client.setSystemListener(new ISystemListener)
{...
....
....
}
client.connect(jnlp,user,pass);

Ex: I want if after 5seconds if client not connected, I want to cancel connecting, and login by another account.

To wait for the client to connect you can use the following code

int i = 10;
while (i > 0 && !client.isConnected()) {
    Thread.sleep(1000);
    i--;
}