need help (urgent)!!!

[macello java]

hi, guys,
I have got a strange problem.
I use -Djava.rmi.server.hostname=127.0.0.1 as a property to start my RMI server. In my DBServer class, I use following sentences:
{
String hostname = System.getProperty("java.rmi.server.hostname");
Naming.rebind("rmi://"+hostName+":1099/Server", dbServer);
}
In my client side, I use:
{
(DBServer)Naming.lookup("rmi://"+host+":1099/Server");
} to find the remote object.
The problem is when I enter the IP address of the sever, eg, 127.0.0.1, it works well; but when I enter 127.0.1.0, it still works. If I enter 127.0.0.256, it doesn't work; if I enter 127, 127.0, 127.0.0, and 127.1.0.0, it doesn't work. It seems that when RMI looking for the reference of the remote object, it ignores the last two digit of the IP address.
Please help to fix it. I will take the exam at the beginning of next month.
Thanks a lot!
macellow

[Laudney Ren]

127.*.*.* is loop address. But normally, only 127.0.0.1 is considered to be the "genuine" loop address.
As for your test:
127.0.0.256: 256 is invalid. 255 is for broadcast. You may use any number >0 and <255
127, 127.0, 127.0.0 are invalid IP addresses.
127.1.0.0 should work. If not, try to change it into 127.1.0.1. If works, then the last number can't be 0.
BTW, I don't think what you are experiencing is required in the project.
-- Laudney