how to change fields of server using RMI from a client?

[Xiaoyan Sun]

Hi all,

I want a client to use RMI to change field value of a server.

for example,
//interface

public [b]interface[/b] OpFunction extends Remote {
public void putFinger(int [][]finger)throws RemoteException;
}

//server

public class Server extends UnicastRemoteObject implements OpFunction{
.......
int [][] fingertable;
public void putFinger(int[][]finger)throws RemoteException{
		fingertable=finger;	
	}
public static void main(String args[]){
Server s = new Server()
LocateRegistry.createRegistry(1099);
Naming.rebind("//localhost:1099"+"/OpFunction", s);			
}
}

//client

public class Client(){
OpFunction op = (OpFunction)Naming.lookup(url+"/OpFunction");
int[][]finger=new int[2][3];
..........
op.putFinger(finger);
}

I'm new to RMI. It seems that I cannot change the field of the server. But I have to use this way to update the fields of server,I mean through RMI. Can anybody give me a hint? I will appriate that.

[NK: Added code tags. Please UseCodeTags]

[Nitesh Kant]

Xiaoyan Sun wrote:But I have to use this way to update the fields of server,I mean through RMI.

Yes RMI is an easy way to update the server state. You do not want to use RMI?

[Xiaoyan Sun]

I do want to change field using RMI. But it doesn't work. When i try to print the fingertable, it is null. I don't know where i am wrong.

[Abhijeet Nalawade]

Xiaoyan,

If your problem is not solved could you please do a few amendments to your code.

//OpFunction interface modifications
String REGISTRY_NAME = "//localhost:1099/OpFunction";
int REGISTRY_PORT = 1099;


//Server, main() modifications

Registry registry = LocateRegistry.getRegistry(OpFunction.REGISTRY_PORT);
OpFunction opFunctionReference = (OpFunction) UnicastRemoteObject.exportObject(new Server());
registry.rebind(OpFunction.REGISTRY_NAME, opFunctionReference);

//Client, method modifications

 
Registry registry = LocateRegistry.getRegistry(OpFunction.REGISTRY_PORT);
OpFunction opFunctionReference = (OpFunction) registry.lookup(OpFunction.REGISTRY_NAME);
opFunctionReference.putFinger(finger);

Let me know if you face any further problems.

[Xiaoyan Sun]

Thank you for reply, Abhijeet
My problem was solved.