CODEWITHSUNDEEP
javaserverrmimalformedurlexception
Chiara Bufalino
Chiara Bufalino

Reputation: 21

RMI Server-side java.net.MalformedURLException: unknown protocol: c

I surfed the net for 2 days, and I didn't find a solution formyproblem, so I decided to ask here. I'm doing a book exercise: "Write a program Client-Server with Java RMI, that return the sum of integer given by clients. It has to implement a method to add an integer, anda method to get the total". I'm facing with the Server-side.

The error the program returns is:

java.rmi.UnmarshalException: Error unmarshaling return; nested exception is: 
java.net.MalformedURLException: unknown protocol: c
at sun.rmi.transport.StreamRemoteCall.executeCall(Unknown Source)
at sun.rmi.server.UnicastRef.invoke(Unknown Source)
at sun.rmi.registry.RegistryImpl_Stub.bind(Unknown Source)
at java.rmi.Naming.bind(Unknown Source)
at ContatoreServer.main(ContatoreServer.java:15)
Caused by: java.net.MalformedURLException: unknown protocol: c
    at java.net.URL.<init>(Unknown Source)
    at java.net.URL.<init>(Unknown Source)
    at java.net.URL.<init>(Unknown Source)
    at sun.rmi.server.LoaderHandler.pathToURLs(Unknown Source)
    at sun.rmi.server.LoaderHandler.getDefaultCodebaseURLs(Unknown Source)
    at sun.rmi.server.LoaderHandler.loadClass(Unknown Source)
    at java.rmi.server.RMIClassLoader$2.loadClass(Unknown Source)
    at java.rmi.server.RMIClassLoader.loadClass(Unknown Source)
    at sun.rmi.server.MarshalInputStream.resolveClass(Unknown Source)
    at java.io.ObjectInputStream.readNonProxyDesc(Unknown Source)
    at java.io.ObjectInputStream.readClassDesc(Unknown Source)
    at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
    at java.io.ObjectInputStream.readObject0(Unknown Source)
    at java.io.ObjectInputStream.readObject(Unknown Source)
    ... 5 more

Here there are my classes: LocalObject

public class ContatoreLocale {
    private int num;

    public ContatoreLocale(){
        this.num=0;
    }

    public synchronized int get(){
        return this.num;
    }

    public synchronized void add(int i){
        this.num+=i;
    }
}

Remote Interface

public interface IContatore extends Remote{
    int get() throws RemoteException;
    void add(int i) throws RemoteException;

}

Remote Object

public class ContatoreRemoto extends ContatoreLocale implements IContatore{
    Logger log= Logger.getLogger("global");

    //Costruttore
    public ContatoreRemoto() throws RemoteException{
        super();
        UnicastRemoteObject.exportObject(this, 0);
        try {
            Naming.rebind("Contatore", this);
            //errore
        } catch (MalformedURLException e) {
            e.printStackTrace();
        }   
    }

    public int get(String nome) throws RemoteException{
        return this.get();
    }

    public void add(String nome,int i) throws RemoteException{
        this.add(i);
    }
}

Server

public class ContatoreServer {
    static Logger log= Logger.getLogger("global");

    public static void main(String[] args) {
            try {
                ContatoreRemoto cr=new ContatoreRemoto();
                log.info("Server Pronto");
            } catch (RemoteException e) {
                e.printStackTrace();
            }
        }
    }

Please, help me :S

Upvotes: 1

Views: 1603

Answers (1)

ardot
ardot

Reputation: 11

In my experience, this has to do with the absolute path in the File System where the RMI Eclipse project is placed. I think you may have a blank, a space, in the path. So RMI is unable to parse the path and it is interrupted, ... then we get the 'malformed' exception. It might be near a 'c', and for this reason, you get the 'c' in the exception. I recommend you go to the file system, navigate to the project folder, and check the absolute path to the project. I bet you have a blank. Such as c:\Users\mylab c\MyProjects.... Did you notice the blank space?

Upvotes: -1

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