I have modified the code in order to provide a better message. The warning is not an real error or bug because when you are using on the same NIC IPv4 and IPv6 you will receive Multicast packet from either the IPs from the OS.
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Setting this:
UPnP.setEnable(UPnP.USE_ONLY_IPV4_ADDR);
...disables ipv6 and stops the warning messages.
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Is this still a bug anyway?
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I have modified the code in order to provide a better message. The warning is not an real error or bug because when you are using on the same NIC IPv4 and IPv6 you will receive Multicast packet from either the IPs from the OS.
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I don't know if that could be considered as bug because it seems to be related to Java which report to UPnP "too many packets"