Cluster exception: "Unable to refresh sockets:"

Question

I'm getting an exception after starting my Tomcat server with my webapp that is using coherence. In all other environments I have not gotten this error with the same tomcat and app but this new environment is a linux box with multiple interfaces.
I think it has something to do with the multicast communications which I would happily disable for now if I could but no matter what I set I still get this exception.
2009-12-07 14:37:29,594 ERROR Logger@9264948 3.5.2/463 Coherence - 2009-12-07 14:37:29.594/137.767 Oracle Coherence GE 3.5.2/463 <Error> (thread=PacketListenerN, member=1): Stopping cluster due to unhandled exception: com.tangosol.net.messaging.ConnectionException: Unable to refresh sockets: [UnicastUdpSocket{State=STATE_OPEN, address:port=172.16.96.56:8088}, MulticastUdpSocket{State=STATE_OPEN, address:port=224.3.5.2:35463, InterfaceAddress=172.16.96.56, TimeToLive=4}, TcpSocketAccepter{State=STATE_OPEN, ServerSocket=172.16.96.56:8088}]; last failed socket: MulticastUdpSocket{State=STATE_OPEN, address:port=224.3.5.2:35463, InterfaceAddress=172.16.96.56, TimeToLive=4}
at com.tangosol.coherence.component.net.Cluster$SocketManager.refreshSockets(Cluster.CDB:91)
at com.tangosol.coherence.component.net.Cluster$SocketManager$MulticastUdpSocket.onInterruptedIOException(Cluster.CDB:9)
at com.tangosol.coherence.component.net.socket.UdpSocket.receive(UdpSocket.CDB:33)
at com.tangosol.coherence.component.net.UdpPacket.receive(UdpPacket.CDB:4)
at com.tangosol.coherence.component.util.daemon.queueProcessor.packetProcessor.PacketListener.onNotify(PacketListener.CDB:19)
at com.tangosol.coherence.component.util.Daemon.run(Daemon.CDB:42)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.net.SocketTimeoutException: Receive timed out
at java.net.PlainDatagramSocketImpl.receive0(Native Method)
at java.net.PlainDatagramSocketImpl.receive(PlainDatagramSocketImpl.java:136)
at java.net.DatagramSocket.receive(DatagramSocket.java:712)
at com.tangosol.coherence.component.net.socket.UdpSocket.receive(UdpSocket.CDB:20)
at com.tangosol.coherence.component.net.UdpPacket.receive(UdpPacket.CDB:4)
at com.tangosol.coherence.component.util.daemon.queueProcessor.packetProcessor.PacketListener.onNotify(PacketListener.CDB:19)
at com.tangosol.coherence.component.util.Daemon.run(Daemon.CDB:42)
at java.lang.Thread.run(Thread.java:619)
My tangosol-coherence-config:
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<coherence>
<multicast-listener>
<address>224.1.0.0</address>
<time-to-live>0</time-to-live>
<port>2342</port>
<join-timeout-seconds>1</join-timeout-seconds>
</multicast-listener>
<unicast-listener>
<well-known-addresses>
<socket-address id="1">
<address>127.0.0.1</address>
<port>8088</port>
</socket-address>
</well-known-addresses>
</unicast-listener>
<logging-config>
<destination>log4j</destination>
<severity-level>4</severity-level>
<character-limit>4096</character-limit>
</logging-config>
</coherence>
So my first question is what is the correct way to disable multicast? Second question is about the exception as to what may be causing it. Thanks much.
- Matt

Answer 1

The log indicated that you were not using the coherence override file you specified.
Log showing muticast address used was 224.3.5.2:35463 (the default one for 3.5.2 build 463), which is not what specified in your override file.
The correct way to disable multicast is not to configure them in your override file and use well-known-address.
And your well-known-address setup is a little wierd, 127.0.0.1?