在java中测试TCP Keepalive

Question

我试图在java中测试TCP Keepalive参数， KEEPALIVE_IDLE_TIME，KEEPALIVE_PROBE_COUNT，KEEPALIVE_INTERVAL_TIME由OS设置和控制。这三个可以通过线程属性设置。但是我无法通过独立程序重现死连接或空闲套接字的问题（即使在使用thread.sleep之后）。以下是代码段：

public Server(int port)
   {    
          ThreadProperties.setProperty(ThreadProperties.KEEPALIVE_IDLE_TIME,"300" );
ThreadProperties.setProperty(ThreadProperties.KEEPALIVE_PROBE_COUNT, "5");          ThreadProperties.setProperty(ThreadProperties.KEEPALIVE_INTERVAL_TIME,"5");

       try
       {
           server = new ServerSocket(port);
           socket= new Socket("127.0.0.1",6001);
           socket.setKeepAlive(true);
           socket = server.accept();
           try {
                Thread.sleep(600000); //wait for 10 min
            } catch (InterruptedException e) {
                e.printStackTrace();
            }        
              OutputStream outstream = socket.getOutputStream();
              PrintWriter out = new PrintWriter(outstream);
              String toSend = "String to send to server";
              out.write(toSend );
           socket.close();
       }
       catch(IOException i)
       {
           System.out.println(i);
       }
   }

理想情况下，套接字应该在out.write（toSend）步骤中空闲并失败。但它仍然处于既定状态并且没有任何例外地关闭。如何在java中测试这个用例？