Problem passing objects as parameters to remote methods via RMI

[nicoeschpiko]

I am getting the following error code:

$ java -jar project_Client.jar
java.lang.IllegalArgumentException: argument type mismatch
at sun.reflect.NativeMethodAccessorImpl.invoke0(Nativ e Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknow n Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Un known Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
at sun.rmi.transport.Transport$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Unknown Source)
at sun.rmi.transport.tcp.TCPTransport.handleMessages( Unknown Source)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandl er.run0(Unknown Source)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandl er.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run Task(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run (Unknown Source)
at java.lang.Thread.run(Unknown Source)
at sun.rmi.transport.StreamRemoteCall.exceptionReceiv edFromServer(Unknown Source)
at sun.rmi.transport.StreamRemoteCall.executeCall(Unk nown Source)
at sun.rmi.server.UnicastRef.invoke(Unknown Source)
at java.rmi.server.RemoteObjectInvocationHandler.invo keRemoteMethod(Unknown Source)
at java.rmi.server.RemoteObjectInvocationHandler.invo ke(Unknown Source)
at $Proxy2.getBalance(Unknown Source)
at class.project.Client.printBalances(Unknown Source)
at class.project.Client.testATM(Unknown Source)
at class.project.Client.main(Unknown Source)
Failed as expected: java.lang.IllegalArgumentException: argument type mismatch
Failed as expected: java.lang.IllegalArgumentException: argument type mismatch
Failed as expected: java.lang.IllegalArgumentException: argument type mismatch
Unexpected error: java.lang.IllegalArgumentException: argument type mismatch
Unexpected error: java.lang.IllegalArgumentException: argument type mismatch
Unexpected error: java.lang.IllegalArgumentException: argument type mismatch
Unexpected error: java.lang.IllegalArgumentException: argument type mismatch
Failed as expected: java.lang.IllegalArgumentException: argument type mismatch
Unexpected error: java.lang.IllegalArgumentException: argument type mismatch
java.lang.IllegalArgumentException: argument type mismatch
at sun.reflect.NativeMethodAccessorImpl.invoke0(Nativ e Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknow n Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Un known Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
at sun.rmi.transport.Transport$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Unknown Source)
at sun.rmi.transport.tcp.TCPTransport.handleMessages( Unknown Source)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandl er.run0(Unknown Source)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandl er.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run Task(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run (Unknown Source)
at java.lang.Thread.run(Unknown Source)
at sun.rmi.transport.StreamRemoteCall.exceptionReceiv edFromServer(Unknown Source)
at sun.rmi.transport.StreamRemoteCall.executeCall(Unk nown Source)
at sun.rmi.server.UnicastRef.invoke(Unknown Source)
at java.rmi.server.RemoteObjectInvocationHandler.invo keRemoteMethod(Unknown Source)
at java.rmi.server.RemoteObjectInvocationHandler.invo ke(Unknown Source)
at $Proxy2.getBalance(Unknown Source)
at class.project.Client.printBalances(Unknown Source)
at class.project.Client.testATM(Unknown Source)
at class.project.Client.main(Unknown Source)

when attempting to pass an AccountInfo object from my Client to the ATMServer.

Here is my AccountInfo.java code:

package class.project;

import java.rmi.RemoteException;


public class AccountInfo extends java.rmi.server.UnicastRemoteObject {
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	private int account_number;
	private int pin_number;
	
	public AccountInfo(int account_number, int pin_number) throws RemoteException {
		super();
		this.account_number = account_number;
		this.pin_number = pin_number;
	}
	
	public int getAccountNumber() {
		return this.account_number;
	}
	
	public void setAccountNumber(int account_number) {
		this.account_number = account_number;
	}
	
	public int getPinNumber() {
		return this.pin_number;
	}
	
	public void setPinNumber(int pin_number) {
		this.pin_number = pin_number;
	}
}

My ATMImpl.java's getBalance method:

public Float getBalance(AccountInfo account_info) throws java.rmi.RemoteException, ATMException,
		SecurityException, Exception {
		System.out.println("Entered getBalance()");
		
		notifyListenersInit();
		
		try {
			this.security.authenticateTransaction(account_info);
			this.security.authorizeTransaction(account_info, 'b');
		} catch (SecurityException se) {
			throw se;
		} catch (Exception e) {
			throw e;
		}

		Account account = null;
		account = this.bank.getAccount(account_info);
		
		return account.getBalance();
	}

and, the relevant Client.java methods causing this error:

	public static void printBalances(ATM atm) {
		try {
			System.out.println("Balance(0000001): "+atm.getBalance(getAccountInfo(0000001, 1234)));
			System.out.println("Balance(0000002): "+atm.getBalance(getAccountInfo(0000002, 2345)));
			System.out.println("Balance(0000003): "+atm.getBalance(getAccountInfo(0000003, 3456)));
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

and

	public static AccountInfo getAccountInfo(int account_number, int pin_number) throws RemoteException {
		return new AccountInfo(account_number, pin_number);
	}

Any help is much appreciated! Thanks.

[nicoeschpiko]

This is quite confusing. An object of type AccountInfo is passed from the Client, and the ATM getBalance method is expecting an object of type AccountInfo via the ATM stub. AccountInfo extends java.rmi.server.UnicastRemoteObject which makes it serializable and able used in a remote method. I am wondering if this AccountInfo object needs to be cast as something else? Any ideas?