How to start rmic registry and server using java 1.7? - rmi

Question

I am new to java RMI, actually I wrote, compiled and started rmic, and also tried to start server but failed due to _stub 'ClassNotFound' exception..... I'm using java 7... I searched a lot on Google but nobody told step by step example that could work...I got some idea about stteing codebase and security policy but not very clear suggestion that how to do it.. please help telling me steps including command-line .......... please... I have everything just tell me how to start server, and required settings like codebase or policy settings etc... Thanks

Answer 1

You don't need to use rmic. Instead, create your server object and call one of the exportObject() method overloads that has the port parameter. For example,
MyRemoteIntf stub = UnicastRemoteObject.exportObject(server, 0);
This will cause RMI to generate the stub automatically. (The documentation is horribly unclear on this point. If you use the version without the port parameter, it will use only the old, rmic-generated stubs instead of generating them automatically.)
Also, make sure that your remote interface is in the codebase of both the registry and any clients. You'll get different errors if you haven't done this properly. This has been answered a bunch of times on Stackoverflow already; search for "rmi ClassNotFoundException".

Answer 2

There is no need to use the rmic command since java (J2SE) 5.0 the stubs are dynamically generated at runtime.
Here is a basic step by step example of how to use RMI.
First define the Remote interface that defines what the client can see and do:
public interface FooService extends Remote {
// Don't forget to add throws RemoteException.
public void bar() throws RemoteException;
}
NOTE: if you do not add throws RemoteException to the method declaration you will encounter the following exception:
java.lang.IllegalArgumentException: illegal remote method encountered: public abstract void RMIExample.FooService.bar()
After you defined what the client can do you must define the concrete implementation of the methods on the server slide:
public class FooServiceImpl extends UnicastRemoteObject implements FooService {
public FooServiceImpl() throws RemoteException {
super();
}
public void bar() {
System.out.println("I was remotely invoked!");
}
}
The implementation class must inherit from UnicastRemoteObject and implement the Remote interface you defined earlier and the class must have a constructor that throws RemoteException.
Now that you have fully defined the remote functionality you must bind the implementation object to a URL on the server side:
// 4000 is the port to listen on.
LocateRegistry.createRegistry(4000);
Naming.rebind("//127.0.0.1:4000/foobar", new FooServiceImpl());
Now that you have your server up and running you need a stub instance A.K.A a proxy in the client side:
FooService fooService =
(FooService)Naming.lookup("//127.0.0.1:4000/foobar");
and finally invoke the remote method:
fooService.bar();
the following should be printed on the server side:
I was remotely invoked!
References:
http://en.wikipedia.org/wiki/Java_remote_method_invocation
http://docs.oracle.com/javase/1.5.0/docs/guide/rmi/relnotes.html