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  Lingering ServerSocket after close() ?  (Read 2704 times)
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Offline Riven
Administrator

« JGO Overlord »


Medals: 1369
Projects: 4
Exp: 16 years


Hand over your head.


« Posted 2008-01-31 19:41:12 »

Hey guys,


Maybe I'm revealing my ignorance again, in these threads about networking, but I encountered this:

I have this ServerSocket, bound to port N.
I call setReuseAddress(false);
I close() it and isClosed() returns true.
I try creating a new ServerSocket binding it to port N.

1  
java.net.BindException: Address already in use


After a while, creating the new ServerSocket succeeds.


OS: CentOS (RedHat thingy)


Working around this with this method...

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   private static ServerSocket createServerSocket(int port, int backlog, InetAddress bind) throws IOException
   {
      int maxTries = 10;
      long interval = 250;
     
      for(int i=1; i<=maxTries; i++)
      {
         try
         {
            return new ServerSocket(port, backlog, bind);
         }
         catch(IOException exc)
         {
            if(i==maxTries)
               throw exc;
         }

         try
         {
            Thread.sleep(interval);
         }
         catch(InterruptedException exc)
         {
            // ignore
         }
      }
     
      // impossible to get here
      return null;
   }

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Offline Mr_Light

Senior Devvie


Medals: 1


shiny.


« Reply #1 - Posted 2008-02-01 22:14:28 »

that might just be the underlaying OS, no time to investigate atm.

It's harder to read code than to write it. - it's even harder to write readable code.

The gospel of brother Riven: "The guarantee that all bugs are in *your* code is worth gold." Amen brother a-m-e-n.
Offline elias

Senior Devvie





« Reply #2 - Posted 2008-02-02 13:32:50 »

You use setReuseAddress on the second ServerSocket to indicate that you don't care about lingering connections, and want to use the old address immediately. Setting setReuseAddress on the first ServerSocket has no effect on the second ServerSocket.

 - elias

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Offline Riven
Administrator

« JGO Overlord »


Medals: 1369
Projects: 4
Exp: 16 years


Hand over your head.


« Reply #3 - Posted 2008-02-02 16:12:32 »

Hm... that explains it. Thanks!

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Learn how to award medals... and work your way up the social rankings!
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