RMI

<make remote interface>

1. extends java.rmi.remote

2. exception RemoteException at all

3. return value is primitive or serializable.

<make service class>

1. make remote interface

2. extends UnicastRemoteObject

3. make Remoteexception

4. registring

<make stub and skeleton>

1. execute RMIC

2. result is 2class maked
  a. _Stub
  b. _Skel

<execute rmiregistry>
1. rmiregistry
2. start service