Java socket : how to prevent java.net.BindException

Question

I have implemented a LAN game and test on same computer by : create a class, create a server and a client in different thread in this class and connect together.

After I close two windows (client and server) and I do above step again : run java class, create a server and a client. I always meet this error : java.net.BindException (because this port has been created before and hasn't closed yet).

Every time I create server socket, in catch, I always put serverSocket.close(). but that error still met with me. Please give me some ideas to prevent this.

@ : and if we know one port has been created, can we close it, and make new ones ?

Thanks :)

Cory Kendall · Accepted Answer · 2012-10-08 19:04:52Z

2

Anything put in a catch block isn't run unless an Exception is caught. Instead, put the close() call in a finally block to ensure it is always run.

answered Oct 8, 2012 at 19:04

Cory Kendall

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Jordan Denison · Accepted Answer · 2012-10-08 19:03:35Z

2

You should put serverSocket.close() in your finally block and maybe wait a few seconds before trying to bind to that address again.

answered Oct 8, 2012 at 19:03

Jordan Denison

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Kovács Ede · Accepted Answer · 2014-05-14 08:16:52Z

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After calling close() on channel could be not enough. See explanation here: http://hea-www.harvard.edu/~fine/Tech/addrinuse.html The TCP connection could stay in CLOSE-WAIT or TIME-WAIT state. You can play with reusing the address (SO_REUSEADDR), but it didn't work for me. The best is to wait exactly the timeout which is set for CLOSE-WAIT or TIME-WAIT on network level.

answered May 14, 2014 at 8:16

Kovács Ede

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