java.net.ConnectException: Connection refused: connect

[Nikhil Jain]

Hi,

I have a small client-server component.
.i.e. I create a serversocket & then call accept on it (Multithreaded).

I am writing a client which calls the server in a loop. When I call the server, i sometimes get
java.net.ConnectException: Connection refused: connect

Is this due to fact that the client is sending request to the server that is faster that the server can accept connections??

When I slowed down the request by putting some sort of sleep in my client, the occurence of the above exception was less?

for (i = 0; i < 500; i++, j++)
if (j == 50) {
Thread.sleep(1000);
k=0
}
//call server code here
}

What is the limit of the java socket server to accept connections?

[Stan James]

Is your server processing the request on the same thread that accepts connections? That would cause slower performance and might get bad enough to refuse connections. This kind of thing is typical:

 
private void acceptClientRequests()
{
    executor = Executors.newCachedThreadPool( this );
    while (running)
    {
        try
        {
            executor.execute( new MessageHandler( serverSocket.accept() ) );
        }
        catch (IOException e)
        {
            if (running)
                throw new WikiException( ... );
        }
    }
}

You can do even cooler things with NIO.