RMI unmarshling error while registering

[rajshkhr pandey]

Hello to all

I am trying to develop the call back server through RMI and get following error while running my Client code

 
Client's Contructor :
Registering to the server
Exception in thread "main" java.security.AccessControlException: access denied (java.net.SocketPermission 192.168.1.6:49291 connect,resolve)
        at java.security.AccessControlContext.checkPermission(AccessControlContext.java:323)
        at java.security.AccessController.checkPermission(AccessController.java:546)
        at java.lang.SecurityManager.checkPermission(SecurityManager.java:532)
        at java.lang.SecurityManager.checkConnect(SecurityManager.java:1034)
        at java.net.Socket.connect(Socket.java:513)
        at java.net.Socket.connect(Socket.java:469)
        at java.net.Socket.<init>(Socket.java:366)
        at java.net.Socket.<init>(Socket.java:180)
        at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(RMIDirectSocketFactory.java:22)
        at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMasterSocketFactory.java:128)
        at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:595)
        at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:198)
        at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:184)
        at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:110)
        at Server_Stub.registerToTheServer(Unknown Source)
        at Client.main(Client.java:21)

my policy file for client

grant codeBase "file:\\d:\callMeBack\callMeBackRegister\Client"
{
	permission java.security.AllPermission;
};

I tried to run my code with both with and without policy file but the error is same

the interface files are
interFile.java (Used to register the call back object to the server)

import java.rmi.Remote;
import java.rmi.RemoteException;

interface interFile extends Remote
{
	public void registerToTheServer(callBackInter cbInt) throws RemoteException;
}

callBackInter.java (used to reply to Client)

import java.rmi.Remote;
import java.rmi.RemoteException;

interface callBackInter extends Remote
{
	public void callFromServer(String str) throws RemoteException;
}

Client.java

import java.rmi.Naming;
import java.rmi.RemoteException;
import java.rmi.registry.Registry;
import java.rmi.NotBoundException;
import java.rmi.registry.LocateRegistry;
import java.net.MalformedURLException;
import java.io.Serializable;
import java.rmi.RMISecurityManager;

class Client implements callBackInter,Serializable
{
	static String namingServer="rmi://localhost:1099/clientConnecting";
	
	public static void main(String args[]) throws RemoteException,NotBoundException,MalformedURLException
	{
		//System.setSecurityManager(new RMISecurityManager());
		Client clnt=new Client();
		System.out.println("Client's Contructor : ");
		interFile intFil=(interFile)Naming.lookup(namingServer);
		System.out.println("Registering to the server ");
		intFil.registerToTheServer(this); //clnt
		System.out.println("Registered to the server ");
	}

	public void callFromServer(String str) throws RemoteException
	{
		System.out.println("Server says : "+str);
	}
}

Server.java

import java.rmi.RemoteException;
import java.rmi.registry.Registry;
import java.rmi.NotBoundException;
import java.rmi.registry.LocateRegistry;
import java.net.MalformedURLException;
import java.rmi.server.UnicastRemoteObject;
import java.rmi.RMISecurityManager;
import java.io.Serializable;

class Server extends Thread implements interFile,Serializable
{
	callBackInter cbInt=null;

	public static void main(String a[]) throws RemoteException
	{
		//System.setSecurityManager(new RMISecurityManager());
		Server ser=new Server();
		System.out.println("Server started");
		interFile intFil=(interFile)UnicastRemoteObject.exportObject(ser,0);
		Registry registry=LocateRegistry.getRegistry(1099);
		registry.rebind("clientConnecting",intFil);
	}

	public void registerToTheServer(callBackInter cbInt)  throws RemoteException
	{
		this.cbInt=cbInt;
		try
		{
			this.sleep(5000);
		} catch(Exception e) {}
		cbInt.callFromServer("Hello");
	}
}

When I run my code without security manager, It gives me following error

Client's Contructor :
Registering to the server
Exception in thread "main" java.rmi.ServerException: RemoteException occurred in server thread; nested exception is:
        java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is:
        java.lang.ClassNotFoundException: Client (no security manager: RMI class loader disabled)
        at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:336)
        at sun.rmi.transport.Transport$1.run(Transport.java:159)
        at java.security.AccessController.doPrivileged(Native Method)
        at sun.rmi.transport.Transport.serviceCall(Transport.java:155)
        at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:535)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:790)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:649)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:619)
        at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:255)
        at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:233)
        at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:142)
        at Server_Stub.registerToTheServer(Unknown Source)
        at Client.main(Client.java:21)
Caused by: java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is:
        java.lang.ClassNotFoundException: Client (no security manager: RMI class loader disabled)
        at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:296)
        at sun.rmi.transport.Transport$1.run(Transport.java:159)
        at java.security.AccessController.doPrivileged(Native Method)
        at sun.rmi.transport.Transport.serviceCall(Transport.java:155)
        at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:535)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:790)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:649)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.ClassNotFoundException: Client (no security manager: RMI class loader disabled)
        at sun.rmi.server.LoaderHandler.loadClass(LoaderHandler.java:375)
        at sun.rmi.server.LoaderHandler.loadClass(LoaderHandler.java:165)
        at java.rmi.server.RMIClassLoader$2.loadClass(RMIClassLoader.java:620)
        at java.rmi.server.RMIClassLoader.loadClass(RMIClassLoader.java:247)
        at sun.rmi.server.MarshalInputStream.resolveClass(MarshalInputStream.java:197)
        at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1575)
        at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1496)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1732)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
        at sun.rmi.server.UnicastRef.unmarshalValue(UnicastRef.java:306)
        at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:290)
        ... 9 more

Please Tell me about this, How to come out of this?
Thanks in advance.

[Joe Ess]

rajshkhr pandey wrote:Hello to all
java.lang.ClassNotFoundException: Client (no security manager: RMI class loader disabled)

Sounds to me like you are missing a security manager.
I'm going to move this to the Distributed Programming forum, where RMI is discussed.

[rajshkhr pandey]

Joe Ess wrote:

rajshkhr pandey wrote:Hello to all
java.lang.ClassNotFoundException: Client (no security manager: RMI class loader disabled)

Sounds to me like you are missing a security manager.
I'm going to move this to the Distributed Programming forum, where RMI is discussed.

Thanks for the reply apologies to post the in wrong forum

But when I use security manager the error again arise if java.security.AccessControlException

# Client's Contructor :
# Registering to the server
# Exception in thread "main" java.security.AccessControlException: access denied (java.net.SocketPermission 192.168.1.6:49291 connect,resolve)
# at java.security.AccessControlContext.checkPermission(AccessControlContext.java:323)
# at java.security.AccessController.checkPermission(AccessController.java:546)
# at java.lang.SecurityManager.checkPermission(SecurityManager.java:532)
# at java.lang.SecurityManager.checkConnect(SecurityManager.java:1034)
# at java.net.Socket.connect(Socket.java:513)
# at java.net.Socket.connect(Socket.java:469)
# at java.net.Socket.<init>(Socket.java:366)
# at java.net.Socket.<init>(Socket.java:180)
# at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(RMIDirectSocketFactory.java:22)
# at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMasterSocketFactory.java:128)
# at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:595)
# at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:198)
# at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:184)
# at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:110)
# at Server_Stub.registerToTheServer(Unknown Source)
# at Client.main(Client.java:21)

I tried both also using all -Djavas command while running code but the result is same.
Also I have created the stub files of the Client and Server, and copied in respective folders
But the error is same.

[rajshkhr pandey]

Problem has been resolved

In clients code I have not exported the object using UnicastRemoteObject.
I have just extended the UnicastRemoteObject to the client's class and the application is running no problems.

Thanks a lot for your efforts