Test.java

package com.ringcentral.subscriptions.common;

import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;

public class Test {
    private static final Executor executor = Executors.newCachedThreadPool();

    public static void main(String[] args) throws Exception{
        ServerSocket socket = new ServerSocket(4545);
        while (true){
            try {
                final Socket accept = socket.accept();
                executor.execute(new Runnable() {
                    @Override
                    public void run() {
                        process(accept);
                    }
                });
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    private static void process(Socket accept) {
        // some work
    }
}