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This page contains an archived post to the Jini Forum made prior to February 25, 2002.
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Message:
Jini Multicast problem
Posted by jianbo on January 18, 2001 at 9:09 AM
I am so frustrated!!! Please help! These are part of my code:
----------------------------------
public class FortuneStreamStart implements ServiceIDListener
{
public static void main(String[] args) throws Exception
{
new FortuneStreamStart(); Object keepAlive = new Object();
synchronized(keepAlive) {
try {
keepAlive.wait();
} catch(InterruptedException e) { }
}
} public FortuneStreamStart(String[] args)
{
System.setSecurityManager(new RMISecurityManager()); String[] groups = new String[] { "" };
LookupDiscoveryManager lookupDisc =
new LookupDiscoveryManager(groups, null, null); JoinManager joinMgr =
new JoinManager(new FortuneStreamImpl(),
null, this,
lookupDisc, null);
} public void serviceIDNotify(ServiceID serviceID)
{
System.out.println(serviceID);
}
}
.....
public class FortuneStreamImpl
extends UnicastRemoteObject
implements java.io.Serializable
{
public FortuneStreamImpl()
throws IOException, RemoteException
{
super();
} public String toString()
{
return "jianbo";
}
}
----------------------------------
It is quite simple, right? Well, here is the problem:
After I started it, I got the ServiceID: 6bc8a1c8-6a5a-44eb-99ff-e43732177ebb. Then, I used Jini's Browser to look it up. The Browser showed these:
================================================
Matching services: 2 Service ID: 6bc8a1c8-6a5a-44eb-99ff-e43732177ebb
Service instance: null Service ID: bcf362b3-6b22-4fc1-985d-cf054279e3d9
Service instance: com.sun.jini.reggie.RegistrarProxy@df501ae
ServiceInfo: name=Lookup manufacturer=Sun Microsystems, Inc. vendor=Sun Microsystems, Inc. version=1.1 model= serialNumber=
BasicServiceType: type=Lookup
================================================
I don't understand why my Service instance is null, so I changed JoinManager() line in my cold to: JoinManager joinMgr =
new JoinManager(new String("Test"),
null, this,
lookupDisc, null); Then, the Browser showed these:
================================================
Matching services: 3 Service ID: 09f196e4-b6ff-45ef-ac6c-d8fb0f214ac3
Service instance: Test Service ID: 6bc8a1c8-6a5a-44eb-99ff-e43732177ebb
Service instance: null Service ID: bcf362b3-6b22-4fc1-985d-cf054279e3d9
Service instance: com.sun.jini.reggie.RegistrarProxy@df501ae
ServiceInfo: name=Lookup manufacturer=Sun Microsystems, Inc. vendor=Sun Microsystems, Inc. version=1.1 model= serialNumber=
BasicServiceType: type=Lookup
================================================ You see: The Service instance is "Test" now.
Why my Service instace is null? Why "new String()" works but my "new FortuneStreamImpl()" doesn't? I have tried so many things I can think of, but I simply cannot fix it. Please tell me what I did wrong.
Thanks a lot. (I am using Jini1_1 and JDK1.3.)
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