java - ServerSocket reuseAddress allow bind to an already bound port? -


when using netty, surprised if use reuseaddress option, allows serversocket bind same address without raising "already bind exception"

        serverbootstrap bootstrap = new serverbootstrap(                 new nioserversocketchannelfactory(executors                         .newcachedthreadpool(), executors.newcachedthreadpool()));         bootstrap.setpipelinefactory(new channelpipelinefactory() {             @override             public channelpipeline getpipeline() throws exception {                 channelpipeline p = pipeline();                 p.addlast("handler", new dummyhandler());                 return p;             }         });         bootstrap.setoption("reuseaddress", true);         bootstrap.bind(new inetsocketaddress(2000));         bootstrap.bind(new inetsocketaddress(2000));

i thought reuseaddress allows new socket reuse close-wait socket, different. following result of netstat command

  c:\users\secmask>netstat -a -n|grep 2000   tcp    0.0.0.0:2000           0.0.0.0:0              listening   tcp    0.0.0.0:2000           0.0.0.0:0              listening

am missing something? what's going on?

i assume windows allows due history. bit of security issue. see http://msdn.microsoft.com/en-us/library/ms740618 information how involved options interact. socket gets connection undefined. maybe if narrow down version of windows using narrow down response although not depend on it.


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