Unmarshalling Error while registering an object in RMIRegistery

Hi guys ,
I am executing the code , in which i try to "Server.java" file which binds an object to the RMI registry , but when i run this file it give me following error.

Exception:
java.rmi.ServerException: RemoteException occurred in server thread; nested exception is:
java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is:
java.lang.ClassNotFoundException: bankrmi.Bank

Could anyone please help me out in resolving this issue.

Hi,

please check this link

Thanks , but my problem is not solved yet .

Do you have a class called Bank in a package bankrmi? According to the error the RMI registry can't find one of your classes.

Hunter

yes i have .

Can post some more information? Like the directory structure you are using? I can't really help if I have nothing to go on but

Please find the attached screenshot for error and structure , do you something more ?

can you post the definition of BankImpl?

Hunter

package bankrmi;
import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;
import java.util.Hashtable;
import java.util.Enumeration;

/**
 *
 * @author vlad-adm
 */
public class BankImpl extends UnicastRemoteObject implements Bank {
    private String bankname = null;
    private Hashtable accounts = new Hashtable();

public BankImpl(String name) throws RemoteException {
        super();
        bankname = name;
    }
    public synchronized String[] listAccounts() {
        int size = accounts.size();
        String[] list = new String[size];
        int i = 0;
        Enumeration en = accounts.keys();
        while(en.hasMoreElements()) {
            list[i] = (String)en.nextElement();
            i++;
        }
        return(list);
    }
    public synchronized Account newAccount(String name) throws RemoteException, Rejected {
        AccountImpl account = (AccountImpl) accounts.get(name);
        if (account != null) {
            System.out.println("Account [" + name + "] exists!!!");
           throw new Rejected("Rejected: Bank: " + bankname +
                   " Account for: " + name + " already exists: " + account);
        }
        account = new AccountImpl(name);
        this.accounts.put(name, account);
        System.out.println("Bank: " + bankname + " Account: " + account +
                " has been created for " + name);
        return (Account)account;
    }
    public synchronized Account getAccount(String name) throws RemoteException {
        return (Account) accounts.get(name);
    }
    public synchronized boolean deleteAccount(String name) throws RemoteException {
        AccountImpl account = (AccountImpl) accounts.get(name);
        if (account == null) return false;
        accounts.remove(name);
        System.out.println("Bank: " + this.bankname +
                " Account for " + name + " has been deleted");
        return true;
    }
}

What is the value of the bankname variable? it is supposed to be a url, something like

Hunter

I am passing it in the argument as 'Nordea' for the bank name .

try using "rmi:Nordea"

I got the same error while try using rmi:Nordea.

While compiling the source code , i have noticed that i am getting an error .

Compiling 7 source files to C:\Users\Dell\Documents\NetBeansProjects\RMI_Example01\build\classes
Note: C:\Users\Dell\Documents\NetBeansProjects\RMI_Example01\src\bankrmi\BankImpl.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.

could it be the cause of error.

No that just means you are using deprecated code somewhere in your program, it isn't as big of an issue as the ServerException. Do you have the Bank.class file in the bankrmi.classes.bankrmi folder?

yes i guess ,please find the attached screenshot.

While i am generating the classes and stub s using the following command , in the command prompt.

javac -d classes -cp classes *.java

I think you need the .class files in the bankrmi folder as well.

This is an example directory structure from an example in the Core Java Vol. 2 Book:

server/
->WarehouseServer.class
->Warehouse.class
->WarehouseImpl.class

client/
->WarehouseClient.class
->Warehouse.class

Notice how the Warehouse.class file (in your case Bank.class) is in both folders

Hunter

If you mean that all the classes including the stubs needs to be in the "main" bankrmi folder , then i have tried it out , but it did not make any impact, maybe its not the reason of error.

I didn't mean to imply all the class files, just the Bank.class file. The JVM can't find bankrmi.Bank, that is what the ClassNotFoundException you got is referring to.

Hunter

I tried it prior , got same error.

I know for a fact that you need it in both folders, other than that I'm out of ideas..Sorry

Hunter

Hunter McMillen wrote:No that just means you are using deprecated code somewhere in your program, it isn't as big of an issue as the ServerException.

Not deprecated code, non-generic collection classes. In this case, the Hashtable and Enumeration.

Rob Spoor wrote:

Hunter McMillen wrote:No that just means you are using deprecated code somewhere in your program, it isn't as big of an issue as the ServerException.

Not deprecated code, non-generic collection classes. In this case, the Hashtable and Enumeration.

Thanks, I didn't know that I thought it was for deprecated code.

Hunter

I think i have got the problem , when i extend the Interface with "java.rmi.remote" , its giving me the unmarshalling exception , but when i did not extend it with Remote, the "Server" works fine.

Do you have the server extending java.rmi.Remote? Because the server isnt supposed to do that. The server has access to the real objects(non-remote)

Hunter

It's about time I move this thread to our Distributed Java forum. I should have done so days ago...

can we discuss that problem over the skype , it would be easier than to solve it.