sockets - Java DatagramChannel Multicast Defaults to IPv6 -

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i'm trying write abstract class inherited 3 classes:

  • udpserver
  • multicastserver
  • tcpserver

multicastserver 1 having issues. of now, udp only. when connection received, hand socket predefined consumer<*sockettype*> stored in member m_handler. i'm using selector this.

the main issue i'm running @ time seems default ipv6. i'm getting message:

java.lang.illegalargumentexception: ipv6 socket cannot join ipv4 multicast group

// m_chan member instance of channel type. datagramchannel multicast.  if(tcpmode) // true if generic socket type passed serversocket     ((serversocketchannel)m_chan).socket().bind(sa); else{     if(multicast) // true if generic socket type passed multicastsocket         ((datagramchannel)m_chan).join(inet4address.getbyname(m_host), getipaddr());     else         ((datagramchannel)m_chan).socket().bind(sa); }

and here code getipaddr():

static networkinterface getipaddr() throws socketexception, unknownhostexception{        inetaddress iaddr = inetaddress.getlocalhost();          networkinterface iface = networkinterface.getbyinetaddress(iaddr);     return iface; }

i've tried adding this:

system.setproperty("java.net.preferipv4stack" , "true");

to no avail.

i'm using ipv4.

the following works fine me. same exception describe, when change standardprotocolfamily.inet standardprotocolfamily.inet6, assume somehow used wrong option when creating datagramchannel?

public class test {     public static void main(string[] args) throws ioexception {         networkinterface ni = networkinterface.getnetworkinterfaces().nextelement();         datagramchannel server = datagramchannel.open(standardprotocolfamily.inet)             .setoption(standardsocketoptions.so_reuseaddr, true)             .bind(new inetsocketaddress(5000))             .setoption(standardsocketoptions.ip_multicast_if, ni);         server.join(inet4address.getbyname("225.4.5.6"), ni);     } }

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