Good old ClassNotFoundException _Stub

Question

Hi all,
Once upon a time many moons ago, i could get this stuff to work, now I'm failing miserably .. must be getting old.
Right, I have very simple interface and implementation code as follows:
// Interface
import java.rmi.*;
public interface PerfectTimeI extends Remote
long getPerfectTime() throws RemoteException;
// Implementation
import java.net.*;
import java.rmi.*;
import java.rmi.registry.*;
import java.rmi.server.*;
public class PerfectTime extends UnicastRemoteObject implements PerfectTimeI
public PerfectTime() throws RemoteException {
super();
public long getPerfectTime() throws RemoteException {
return System.currentTimeMillis();
public static void main (String args[]) {
System.setSecurityManager(new RMISecurityManager());
try {
PerfectTime pt = new PerfectTime();
Naming.bind("PerfectTime", pt);
} catch (Exception ex) {
System.err.println("\nException occurred.");
ex.printStackTrace();
System.exit(1);
System.out.println("PerfectTime ... ready.");
I have both source files stored in the same dir and generate the PerfectTime_Stub by using...
rmic -v1.2 PerfectTime
This creates PerfectTime_Stub in C:\code\java\rmitest
CLASSPATH=.;C:\java\code\rmitest (where files are stored)
PerfectTime.policy contains:
grant {
permission java.net.SocketPermission "*:1024-65535", "connect,accept";
permission java.net.SocketPermission "*:80", "connect";
From here I execute rmiregistry:
C:\java\code\rmitest>start rmiregistry
and the application:
C:\java\code\rmitest>java -Djava.security.policy=PerfectTime.policy -Djava.rmi.server.codebase=file:C:\java\code\rmitest PerfectTime
and I get the error:
java.rmi.ServerException: Server RemoteException; nested exception is:
java.rmi.UnmarshalException: error unmarshalling arguments; nested excep
tion is:
java.lang.ClassNotFoundException: PerfectTime_Stub
at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(Stream
RemoteCall.java:247)
at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:
223)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:350)
at sun.rmi.registry.RegistryImpl_Stub.bind(Unknown Source)
at java.rmi.Naming.bind(Naming.java:111)
at PerfectTime.main(PerfectTime.java:31)
Caused by: java.rmi.UnmarshalException: error unmarshalling arguments; nested ex
ception is:
java.lang.ClassNotFoundException: PerfectTime_Stub
Caused by: java.lang.ClassNotFoundException: PerfectTime_Stub
I've tried various combinations of the java PerfectTime command but they all end result in the above error.
I think I'm missing something really obvious but can't seem to put my finger on it. Any ideas anyone ?
Cheers,
John

Answer 1

I am facing the same problem but am not satisfied with your explaination.
I have jdk1.3 and jdk1.4 installed on my system Windows2000 Professional
when I tried to run the application, it gave me same exception
then I added the following line to my code
System.setSecurityManager(new RMISecurityManager());
then it gave me exception
java.security.AccessControlException: access denied (java.net.SocketPermission 127.0.0.1:1099 connect,resolve)
I set this permission using policytool and it again started giving me the same ClassNotFoundException
Same application when I run on another system which is Windows2000 Professional upgraded from WINNT workstation, It runs perfect without any security or classnotfound exceptions..
Is this the bug in Windows2000 or java security model