可以使用Weblogic提供的工具来测试。
用法: java utils.MulticastTest [选项]

-N <名称> 必选
进程的唯一标识.
-A <地址> 必选
组播的虚拟地址,比如: 237.0.0.1
在各个服务器上远行此程序,如果组播配置正确,每台服务器会报告发现新的邻近服务器,这样说明各台服务器可以用组播通讯.
比如, 测试结果如下:
C:\wl7020\weblogic700\samples\server\src\examples>java utils.MulticastTest -N P2 -A 237.0.0.2
***** WARNING ***** WARNING ***** WARNING *****
Do NOT use the same multicast address as a running WLS cluster.

Starting test. Hit any key to abort

Using multicast address 237.0.0.2:7001
Will send messages under the name P2 every 2 seconds
Will print warning every 600 seconds if no messages are received

New Neighbor P1 found on message number 4
I (P2) sent message num 1
Received message 5 from P1
Received message 2 from P2
I (P2) sent message num 2
Received message 6 from P1
Received message 3 from P2
I (P2) sent message num 3
Received message 7 from P1
Received message 4 from P2