Can somebody explain me , what is multicasting? I have addes mycluster for multicasting. But while shutting the server i use to get this error. --------- <Aug 30, 2001 4:34:59 AM PDT> <Error> <Cluster> <Disconnecting from cluster MyCluster> <Aug 30, 2001 4:34:59 AM PDT> <Error> <Cluster> <Multicast socket receive error: java.net.SocketException: socket closed java.net.SocketException: socket closed at java.net.PlainDatagramSocketImpl.receive(Native Method) at java.net.DatagramSocket.receiveDatagramSocket.java:392) at weblogic.cluster.FragmentSocket.receive FragmentSocket.java:128) at weblogic.cluster.MulticastManager.execute(MulticastManager.java:290) at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:137) at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120) > ------- PLease help.
Multicasting is used by WebLogic to communicate between servers in a cluster. Basically, all servers in a cluster listen for messages at a specific multicast address. When a server wants to send a message to the cluster it sends the message to that address and all of the servers listening for messages will receive it. As far as that error goes, I would probably ignore it if it only happens at shutdown. It is probably just a message about try to use the multicast socket after it has been closed. ------------------